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slurm.conf(5) Slurm Configuration File slurm.conf(5) NAME slurm.conf - Slurm configuration file DESCRIPTION slurm.conf is an ASCII file which describes general Slurm configuration information, the nodes to be managed, information about how those nodes are grouped into partitions, and various scheduling parameters associ- ated with those partitions. This file should be consistent across all nodes in the cluster. The file location can be modified at execution time by setting the SLURM_CONF environment variable. The Slurm daemons also allow you to override both the built-in and environment-provided location using the "-f" option on the command line. The contents of the file are case insensitive except for the names of nodes and partitions. Any text following a "#" in the configuration file is treated as a comment through the end of that line. Changes to the configuration file take effect upon restart of Slurm daemons, dae- mon receipt of the SIGHUP signal, or execution of the command "scontrol reconfigure" unless otherwise noted. Changes to TCP listening settings will require a daemon restart. If a line begins with the word "Include" followed by whitespace and then a file name, that file will be included inline with the current configuration file. For large or complex systems, multiple configura- tion files may prove easier to manage and enable reuse of some files (See INCLUDE MODIFIERS for more details). Note on file permissions: The slurm.conf file must be readable by all users of Slurm, since it is used by many of the Slurm commands. Other files that are defined in the slurm.conf file, such as log files and job accounting files, may need to be created/owned by the user "SlurmUser" to be successfully ac- cessed. Use the "chown" and "chmod" commands to set the ownership and permissions appropriately. See the section FILE AND DIRECTORY PERMIS- SIONS for information about the various files and directories used by Slurm. PARAMETERS The overall configuration parameters available include: AccountingStorageBackupHost The name of the backup machine hosting the accounting storage database. If used with the accounting_storage/slurmdbd plugin, this is where the backup slurmdbd would be running. Only used with systems using SlurmDBD, ignored otherwise. AccountingStorageEnforce This controls what level of association-based enforcement to im- pose on job submissions. Valid options are any comma-separated combination of the following, many of which will implicitly in- clude other options: all Implies all other available options except nojobs and nosteps. associations No new job is allowed to run unless a corresponding associa- tion exists in the system. limits Users can be limited by association to whatever job size or run time limits are defined. Implies associations. nojobs Slurm will not account for any jobs or steps on the system. Implies nosteps. nosteps Slurm will not account for any steps that have run. qos Jobs will not be scheduled unless a valid qos is specified. Implies associations. safe A job will only be launched against an association or qos that has a TRES-minutes limit set if the job will be able to run to completion. Without this option set, jobs will be launched as long as their usage hasn't reached the TRES-minutes limit. This can lead to jobs being launched but then killed when the limit is reached. With this option, a job won't be killed due to limits, even if the limits are changed after the job was started and the association or qos violates the updated lim- its. Implies limits and associations. wckeys Jobs will not be scheduled unless a valid workload characteri- zation key is specified. Implies associations and TrackWCKey (a separate configuration option). AccountingStorageExternalHost A comma-separated list of external slurmdbds (<host/ip>[:port][,...]) to register with. If no port is given, the AccountingStoragePort will be used. This allows clusters registered with the external slurmdbd to communicate with each other using the --cluster/-M client com- mand options. The cluster will add itself to the external slurmdbd if it doesn't exist. If a non-external cluster already exists on the external slurmdbd, the slurmctld will ignore registering to the external slurmdbd. AccountingStorageHost The name of the machine hosting the accounting storage database. Only used with systems using SlurmDBD, ignored otherwise. AccountingStorageParameters Comma-separated list of options. max_step_records=The number of steps that are recorded in the database for each job -- excluding batch, extern, and interactive steps. The following comma-separated list of key-value options are used to establish a secure connection to the database: SSL_CERT The path name of the client public key certificate file. SSL_CA The path name of the Certificate Authority (CA) certificate file. SSL_CAPATH The path name of the directory that contains trusted SSL CA certificate files. SSL_KEY The path name of the client private key file. SSL_CIPHER The list of permissible ciphers for SSL encryption. AccountingStoragePass The password used to gain access to the database to store the accounting data. Only used for database type storage plugins, ignored otherwise. In the case of SlurmDBD (Database Daemon) with MUNGE authentication this can be configured to use a MUNGE daemon specifically configured to provide authentication between clusters while the default MUNGE daemon provides authentication within a cluster. In that case, AccountingStoragePass should specify the named port to be used for communications with the alternate MUNGE daemon (e.g. "/var/run/munge/global.socket.2"). The default value is NULL. AccountingStoragePort The listening port of the accounting storage database server. Only used for database type storage plugins, ignored otherwise. The default value is SLURMDBD_PORT as established at system build time. If no value is explicitly specified, it will be set to 6819. This value must be equal to the DbdPort parameter in the slurmdbd.conf file. AccountingStorageTRES Comma-separated list of resources you wish to track on the clus- ter. These are the resources requested by the sbatch/srun job when it is submitted. Currently this consists of any GRES, BB (burst buffer) or license along with CPU, Memory, Node, Energy, FS/[Disk|Lustre], IC/OFED, Pages, and VMem. By default Billing, CPU, Energy, Memory, Node, FS/Disk, Pages and VMem are tracked. These default TRES cannot be disabled, but only appended to. AccountingStorageTRES=gres/craynetwork,license/iop1 will track billing, cpu, energy, memory, nodes, fs/disk, pages and vmem along with a gres called craynetwork as well as a license called iop1. Whenever these resources are used on the cluster they are recorded. The TRES are automatically set up in the database on the start of the slurmctld. If multiple GRES of different types are tracked (e.g. GPUs of different types), then job requests with matching type specifi- cations will be recorded. Given a configuration of "Account- ingStorageTRES=gres/gpu,gres/gpu:tesla,gres/gpu:volta" Then "gres/gpu:tesla" and "gres/gpu:volta" will track only jobs that explicitly request those two GPU types, while "gres/gpu" will track allocated GPUs of any type ("tesla", "volta" or any other GPU type). Given a configuration of "AccountingStorage- TRES=gres/gpu:tesla,gres/gpu:volta" Then "gres/gpu:tesla" and "gres/gpu:volta" will track jobs that explicitly request those GPU types. If a job requests GPUs, but does not explicitly specify the GPU type, then its resource allocation will be ac- counted for as either "gres/gpu:tesla" or "gres/gpu:volta", al- though the accounting may not match the actual GPU type allo- cated to the job and the GPUs allocated to the job could be het- erogeneous. In an environment containing various GPU types, use of a job_submit plugin may be desired in order to force jobs to explicitly specify some GPU type. NOTE: Setting gres/gpu will also set gres/gpumem and gres/gpuu- til. gres/gpumem and gres/gpuutil can be set individually when gres/gpu is not set. AccountingStorageType The accounting storage mechanism type. Unset by default, which indicates that accounting records are not maintained. Current options are: accounting_storage/slurmdbd The accounting records will be written to the SlurmDBD, which manages an underlying MySQL database. See "man slurmdbd" for more information. AccountingStoreFlags Comma separated list used to modify which fields the slurmctld send to the accounting database. Current options are: job_comment Include the job's comment field in the job complete mes- sage sent to the Accounting Storage database. Note the AdminComment and SystemComment are always recorded in the database. job_env Include a batch job's environment variables used at job submission in the job start message sent to the Account- ing Storage database. job_extra Include the job's extra field in the job complete message sent to the Accounting Storage database. job_script Include the job's batch script in the job start message sent to the Accounting Storage database. no_stdio Exclude the stdio paths when recording data into the database on a job or step start. StdOut, StdErr and StdIn db fields for jobs and steps will be empty. AcctGatherNodeFreq The AcctGather plugins sampling interval for node accounting. For AcctGather plugin values of none, this parameter is ignored. For all other values this parameter is the number of seconds be- tween node accounting samples. For the acct_gather_energy/rapl plugin, set a value less than 300 because the counters may over- flow beyond this rate. The default value is zero. This value disables accounting sampling for nodes. Note: The accounting sampling interval for jobs is determined by the value of JobAc- ctGatherFrequency. AcctGatherEnergyType Identifies the plugin to be used for energy consumption account- ing. The jobacct_gather plugin and slurmd daemon call this plu- gin to collect energy consumption data for jobs and nodes. The collection of energy consumption data takes place on the node level, hence only in case of exclusive job allocation the energy consumption measurements will reflect the job's real consump- tion. In case of node sharing between jobs the reported consumed energy per job (through sstat or sacct) will not reflect the real energy consumed by the jobs. Default is nothing is col- lected. Configurable values at present are: acct_gather_energy/gpu Energy consumption data is collected from the GPU management library (e.g. rsmi) for the corresponding type of GPU. Only avail- able for rsmi at present. Note: slurmd will keep gpu plugin loaded after configuration when this is set. acct_gather_energy/ipmi Energy consumption data is collected from the Baseboard Management Controller (BMC) using the Intelligent Platform Management Interface (IPMI). acct_gather_energy/pm_counters Energy consumption data is collected from the Baseboard Management Controller (BMC) for HPE Cray systems. acct_gather_energy/rapl Energy consumption data is collected from hardware sensors using the Running Average Power Limit (RAPL) mechanism. Note that en- abling RAPL may require the execution of the command "sudo modprobe msr". acct_gather_energy/xcc Energy consumption data is collected from the Lenovo SD650 XClarity Controller (XCC) using IPMI OEM raw commands. AcctGatherInterconnectType Identifies the plugin to be used for interconnect network traf- fic accounting. The jobacct_gather plugin and slurmd daemon call this plugin to collect network traffic data for jobs and nodes. The collection of network traffic data takes place on the node level, hence only in case of exclusive job allocation the collected values will reflect the job's real traffic. In case of node sharing between jobs the reported network traffic per job (through sstat or sacct) will not reflect the real net- work traffic by the jobs. Configurable values at present are: acct_gather_interconnect/ofed Infiniband network traffic data are col- lected from the hardware monitoring counters of Infiniband devices through the OFED li- brary. In order to account for per job net- work traffic, add the "ic/ofed" TRES to Ac- countingStorageTRES. acct_gather_interconnect/sysfs Network traffic statistics are collected from the Linux sysfs pseudo-filesystem for specific interfaces defined in acct_gather.conf(5). In order to account for per job network traffic, add the "ic/sysfs" TRES to AccountingStorageTRES. AcctGatherFilesystemType Identifies the plugin to be used for filesystem traffic account- ing. The jobacct_gather plugin and slurmd daemon call this plu- gin to collect filesystem traffic data for jobs and nodes. The collection of filesystem traffic data takes place on the node level, hence only in case of exclusive job allocation the col- lected values will reflect the job's real traffic. In case of node sharing between jobs the reported filesystem traffic per job (through sstat or sacct) will not reflect the real filesys- tem traffic by the jobs. Configurable values at present are: acct_gather_filesystem/lustre Lustre filesystem traffic data are collected from the counters found in /proc/fs/lustre/. In order to account for per job lustre traf- fic, add the "fs/lustre" TRES to Account- ingStorageTRES. AcctGatherProfileType Identifies the plugin to be used for detailed job profiling. The jobacct_gather plugin and slurmd daemon call this plugin to collect detailed data such as I/O counts, memory usage, or en- ergy consumption for jobs and nodes. There are interfaces in this plugin to collect data as step start and completion, task start and completion, and at the account gather frequency. The data collected at the node level is related to jobs only in case of exclusive job allocation. Configurable values at present are: acct_gather_profile/hdf5 This enables the HDF5 plugin. The directory where the profile files are stored and which values are collected are configured in the acct_gather.conf file. acct_gather_profile/influxdb This enables the influxdb plugin. The in- fluxdb instance host, port, database, reten- tion policy and which values are collected are configured in the acct_gather.conf file. AllowSpecResourcesUsage If set to "YES", Slurm allows individual jobs to override node's configured CoreSpecCount value. For a job to take advantage of this feature, a command line option of --core-spec must be spec- ified. The default value for this option is "YES" for Cray sys- tems and "NO" for other system types. AuthAltTypes Comma-separated list of alternative authentication plugins that the slurmctld will permit for communication. Acceptable values at present include auth/jwt. NOTE: If AuthAltParameters is not used to specify a path to the required jwt_hs256.key then slurmctld will default to looking for it in the StateSaveLocation. The jwt_hs256.key should only be visible to the SlurmUser and root. It is not suggested to place the jwt_hs256.key on any nodes other than the machine run- ning slurmctld and the machine running slurmdbd. auth/jwt can be activated by the presence of the SLURM_JWT environment vari- able. When activated, it will override the default AuthType. AuthAltParameters Used to define alternative authentication plugins options. Mul- tiple options may be comma separated. disable_token_creation Disable "scontrol token" use by non-SlurmUser ac- counts. max_token_lifespan=<seconds> Set max lifespan (in seconds) for any token gen- erated for user accounts. Limit applies to all users except SlurmUser. Sites wishing to have per user limits should generate tokens using JWT-com- patible tools, andor an authenticating proxy, in- stead of using scontrol token. jwks= Absolute path to JWKS file. Key should be owned by SlurmUser or root, must be readable by Slur- mUser, with suggested permissions of 0400. It must not be writable by 'other'. Only RS256 keys are supported, although other key types may be listed in the file. If set, no HS256 key will be loaded by default (and token generation is dis- abled), although the jwt_key setting may be used to explicitly re-enable HS256 key use (and token generation). jwt_key= Absolute path to JWT key file. Key must be HS256. Key should be owned by SlurmUser or root, must be readable by SlurmUser, with suggested permissions of 0400. It must not be accessible by 'other'. If not set, the default key file is jwt_hs256.key in StateSaveLocation. userclaimfield= Use an alternative claim field for the Slurm UserName sun field. This option is designed to allow compatibility with tokens generated outside of Slurm. (This field may also be known as a grant.) Default: (disabled) AuthInfo Additional information to be used for authentication of communi- cations between the Slurm daemons (slurmctld and slurmd) and the Slurm clients. The interpretation of this option is specific to the configured AuthType. Multiple options may be specified in a comma-delimited list. If not specified, the default authentica- tion information will be used. cred_expire Default job step credential lifetime, in seconds (e.g. "cred_expire=1200"). It must be suffi- ciently long enough to load user environment, run prolog, deal with the slurmd getting paged out of memory, etc. This also controls how long a re- queued job must wait before starting again. The default value is 120 seconds. socket Path name to a MUNGE daemon socket to use (e.g. "socket=/var/run/munge/munge.socket.2"). The de- fault value is "/var/run/munge/munge.socket.2". Used by auth/munge and cred/munge. ttl Credential lifetime, in seconds (e.g. "ttl=300"). The default value is dependent on the AuthType used. For auth/munge, the default value is depen- dent upon the MUNGE installation, but is typically 300 seconds. For auth/slurm, the default value is 60 seconds. For auth/jwt, the default value is 1800 seconds. use_client_ids Allow the auth/slurm plugin to authenticate users without relying on the user information from LDAP or the operating system. When coupled with nss_slurm, the user information can be managed on the compute nodes by slurmstepd. This would allow the cluster to operate in an environment where only the login nodes have access to LDAP/OS user information. See <https://slurm.schedmd.com/nss_slurm.html> for more information. AuthType The authentication method for communications between Slurm com- ponents. All Slurm daemons and commands must be terminated prior to changing the value of AuthType and later restarted. Changes to this value will interrupt outstanding job steps and prevent them from completing. Acceptable values at present: auth/munge Indicates that MUNGE is to be used (default). (See "https://dun.github.io/munge/" for more information). auth/slurm Use Slurm's internal authentication plugin. BatchStartTimeout The maximum time (in seconds) that a batch job is permitted for launching before being considered missing and releasing the al- location. The default value is 10 (seconds). Larger values may be required if more time is required to execute the Prolog, load user environment variables, or if the slurmd daemon gets paged from memory. NOTE: The test for a job being successfully launched is only performed when the Slurm daemon on the compute node registers state with the slurmctld daemon on the head node, which happens fairly rarely. Therefore a job will not necessarily be termi- nated if its start time exceeds BatchStartTimeout. This config- uration parameter is also applied to launch tasks and avoid aborting srun commands due to long running Prolog scripts. BcastExclude Comma-separated list of absolute directory paths to be excluded when autodetecting and broadcasting executable shared object de- pendencies through sbcast or srun --bcast. The keyword "none" can be used to indicate that no directory paths should be ex- cluded. The default value is "/lib,/usr/lib,/lib64,/usr/lib64". This option can be overridden by sbcast --exclude and srun --bcast-exclude. BcastParameters Controls sbcast and srun --bcast behavior. Multiple options can be specified in a comma separated list. Supported values in- clude: DestDir= Destination directory for file being broadcast to allocated compute nodes. Default value is cur- rent working directory, or --chdir for srun if set. Compression= Specify default file compression library to be used. Supported values are "lz4" and "none". The default value with the sbcast --compress op- tion is "lz4" and "none" otherwise. Some com- pression libraries may be unavailable on some systems. send_libs If set, attempt to autodetect and broadcast the executable's shared object dependencies to allo- cated compute nodes. The files are placed in a directory alongside the executable. For srun only, the LD_LIBRARY_PATH is automatically up- dated to include this cache directory as well. This can be overridden with either sbcast or srun --send-libs option. By default this is disabled. BurstBufferType The plugin used to manage burst buffers. Unset by default. Ac- ceptable values at present are: burst_buffer/datawarp Use Cray DataWarp API to provide burst buffer functional- ity. burst_buffer/lua This plugin provides hooks to an API that is defined by a Lua script. This plugin was developed to provide system administrators with a way to do any task (not only file staging) at different points in a job's life cycle. CertgenParameters Comma-separated options identifying certgen plugin options. Supported values include: certgen_script= Absolute path to executable script to generate self- signed TLS certificate. The private key generated by keygen_script is passed in as stdin, and only the cer- tificate PEM file should be printed to stdout. Must re- turn 0 on success, and non-zero on error. keygen_script= Absolute path to executable script to generate private key used later to generate a self-signed certificate. Only the private key PEM file should be printed to std- out, which will be later sent as stdin to certgen_script. Must return 0 on success, and non-zero on error. CertgenType Specify the certgen plugin that will be used. Acceptable values at present: certgen/script Use built-in/configured scripts to generate certificate key pair. CertmgrParameters Used to define parameters for certmgr plugin. certificate_renewal_period= slurmd/sackd will request a new signed certificate from slurmctld at this specified interval (in minutes). Default is 1440 minutes (once per day). generate_csr_script= Path to script used to generate certificate signing re- quests. The nodename is passed in as an argument to the script. The script must print only the certificate sign- ing request PEM file to stdout, and return 0 on success. Must return non-zero on error. Required with certmgr/script. Only run by daemons re- questing certificates. get_node_cert_key_script= Path to script used to get node's private key which was used to generate the CSR returned by generate_csr_script. The nodename is passed in as an argument to the script. The script must print the node's private key (PEM file) to stdout. Must return 0 on success, and non-zero on er- ror. Required with certmgr/script. Only run by daemons re- questing certificates. get_node_token_script= Path to script used to get node's unique token which will be validated by slurmctld using the script set by vali- date_node_script=. The nodename is passed in as an argu- ment to the script. The script must print the node's unique token to stdout, and return 0 on success. Must re- turn non-zero on error. Required with certmgr/script. Only run by daemons re- questing certificates. sign_csr_script= Path to script used to sign incoming certificate signing requests. This script will only be called if vali- date_node_script= was already called on the accompanying unique node token and returned with a non-zero exit code. The certificate signing request (as given by gener- ate_csr_script=) is passed as an argument to this script. The script must print the new signed certificate to std- out, and return 0 on success. Must return non-zero on er- ror. Required with certmgr/script. Only run by slurmctld. single_use_tokens Unique node tokens that are dynamically set (e.g. set via scontrol) will be consumed upon successful certificate signing. validate_node_script= Path to script used to validate a unique node token. The unique node token is passed as an argument to this script. If the script finds the node token to be valid, return 0. Otherwise, if the node token is invalid, re- turn non-zero. Required with certmgr/script. Only run by slurmctld. CertmgrType Plugin used to dynamically renew TLS certificates for slurmd/sackd. certmgr/script Use script hooks to implement certificate management. See CertmgrParameters for details on how to setup these scripts. CliFilterParameters Extra parameters for cli_filter plugins. Multiple options may be comma-separated. Acceptable values at present are: cli_filter_lua_path=<path> Absolute path to the cli_filter.lua script to be used when cli_filter/lua is enabled. If this is not defined, the default path will be used instead (same path to slurm.conf). NOTE: The configured directory containing the cli_fil- ter.lua script should have 755 permissions, the script itself 644 and both be owned by SlurmdUser. CliFilterPlugins A comma-delimited list of command line interface option fil- ter/modification plugins. The specified plugins will be executed in the order listed. No cli_filter plugins are used by default. Acceptable values at present are: cli_filter/lua This plugin allows you to write your own implementation of a cli_filter using lua. cli_filter/syslog This plugin enables logging of job submission activities performed. All the salloc/sbatch/srun options are logged to syslog together with environment variables in JSON format. If the plugin is not the last one in the list it may log values different than what was actually sent to slurmctld. cli_filter/user_defaults This plugin looks for the file $HOME/.slurm/defaults and reads every line of it as a key=value pair, where key is any of the job submission options available to sal- loc/sbatch/srun and value is a default value defined by the user. For instance: time=1:30 mem=2048 The above will result in a user defined default for each of their jobs of "-t 1:30" and "--mem=2048". ClusterName The name by which this Slurm managed cluster is known in the ac- counting database. This is needed to distinguish accounting records when multiple clusters report to the same database. Be- cause of limitations in some databases, any upper case letters in the name will be silently mapped to lower case. In order to avoid confusion, it is recommended that the name be lower case. The cluster name must be 40 characters or less in order to com- ply with the limit on the maximum length for table names in MySQL/MariaDB. CommunicationParameters Comma-separated options identifying communication options. block_null_hash Require all Slurm authentication tokens to in- clude a newer (20.11.9 and 21.08.8) payload that provides an additional layer of security against credential replay attacks. This option should only be enabled once all Slurm daemons have been upgraded to 20.11.9/21.08.8 or newer, and all jobs that were started before the upgrade have been completed. disable_http Disable responding to incoming HTTP requests for all Slurm daemons. host_unreach_retry_count=When a node tries to connect() to an- other node, connect() may return an error with EHOSTUNREACH if the host is unreachable. If this parameter is set, this is the number of times that Slurm will retry making that connec- tion. Slurm will wait for 500 milliseconds in be- tween each try. The default for this parameter is zero (Slurm will not retry if EHOSTUNREACH is re- turned). DisableIPv4 Disable IPv4 only operation for all slurm daemons (except slurmdbd). This should also be set in your slurmdbd.conf file. EnableIPv6 Enable using IPv6 addresses for all slurm daemons (except slurmdbd). When using both IPv4 and IPv6, address family preferences will be based on your /etc/gai.conf file. This should also be set in your slurmdbd.conf file. getnameinfo_cache_timeout When munge is used as AuthType slurmctld makes use of getnameinfo to obtain the hostname from IP address stored in munge credential. This parame- ter controls the number of seconds slurmctld should keep the IP to hostname resolution. When set to 0 cache is disabled. The default value is 60. keepaliveinterval=Specifies the interval, in seconds, between keepalive probes on idle connections. This affects connections between srun and its slurmstepd process as well as all connections to the slurmdbd. The default is to use the system default settings. keepaliveprobes=Specifies the number of unacknowledged keepalive probes sent before considering the connection broken. This affects connections between srun and its slurmstepd process as well as all connections to the slurmdbd. The default is to use the system default settings. keepalivetime=Specifies how long, in seconds, before a connec- tion is marked as needing a keepalive probe as well as how long to delay closing a connection to process messages still in the queue. This affects connections between srun and its slurmstepd process as well as all connec- tions to the slurmdbd. Longer values can be used to improve reliability of communications in the event of network failures. The default is for keepalive to be disabled. NoCtldInAddrAny Used to directly bind to the address of what the node resolves to running the slurmctld instead of binding messages to any address on the node, which is the default. NoInAddrAny Used to directly bind to the address of what the node resolves to instead of binding messages to any address on the node which is the default. This option is for all daemons/clients except for the slurmctld. CompleteWait The time to wait, in seconds, when any job is in the COMPLETING state before any additional jobs are scheduled. This is to at- tempt to keep jobs on nodes that were recently in use, with the goal of preventing fragmentation. If set to zero, pending jobs will be started as soon as possible. Since a COMPLETING job's resources are released for use by other jobs as soon as the Epi- log completes on each individual node, this can result in very fragmented resource allocations. To provide jobs with the mini- mum response time, a value of zero is recommended (no waiting). To minimize fragmentation of resources, a value equal to Kill- Wait plus two is recommended. In that case, setting KillWait to a small value may be beneficial. The default value of Complete- Wait is zero seconds. The value may not exceed 65533. NOTE: Setting reduce_completing_frag affects the behavior of CompleteWait. CpuFreqDef Default CPU governor to use when running a job step if it has not been explicitly set with the --cpu-freq option. Acceptable values at present include one of the following governors: Conservative attempts to use the Conservative CPU governor OnDemand attempts to use the OnDemand CPU governor Performance attempts to use the Performance CPU governor PowerSave attempts to use the PowerSave CPU governor Default: Use system default. No attempt to set the governor is made if --cpu-freq option has not been specified. CpuFreqGovernors List of CPU frequency governors allowed to be set with the sal- loc, sbatch, or srun option --cpu-freq. Acceptable values at present include: Conservative attempts to use the Conservative CPU governor OnDemand attempts to use the OnDemand CPU governor (a de- fault value) Performance attempts to use the Performance CPU governor (a default value) PowerSave attempts to use the PowerSave CPU governor SchedUtil attempts to use the SchedUtil CPU governor UserSpace attempts to use the UserSpace CPU governor (a de- fault value) Default: OnDemand, Performance and UserSpace. CredType The cryptographic signature tool to be used in the creation of job step credentials. Acceptable values at present are: cred/munge Indicates that Munge is to be used (default). cred/slurm Use Slurm's internal credential format. DataParserParameters=<data_parser> Apply default value for data_parser plugin parameters. See --json or --yaml arguments in sacct(1), scontrol(1), sinfo(1), squeue(1), sacctmgr(1), sdiag(1), and sshare(1). Default: Latest data_parser plugin version with no flags se- lected. DebugFlags Defines specific subsystems which should provide more detailed event logging. Multiple subsystems can be specified with comma separators. Most DebugFlags will result in additional logging messages for the identified subsystems if SlurmctldDebug is at 'verbose' or higher. More logging may impact performance. NOTE: You can also set debug flags by having the SLURM_DE- BUG_FLAGS environment variable defined with the desired flags when the process (client command, daemon, etc.) is started. The environment variable takes precedence over the setting in the slurm.conf. Valid subsystems available include: Accrue Accrue counters accounting details Agent RPC agents (outgoing RPCs from Slurm daemons) AuditRPCs For all inbound RPCs to slurmctld, print the originating address, authenticated user, and RPC type before the connection is processed. AuditTLS Print TLS certificates being used Backfill Backfill scheduler details BackfillMap Backfill scheduler to log a very verbose map of reserved resources through time. Combine with Backfill for a verbose and complete view of the backfill scheduler's work. BurstBuffer Burst Buffer plugin Cgroup Cgroup details ConMgr Connection manager details CPU_Bind CPU binding details for jobs and steps CpuFrequency Cpu frequency details for jobs and steps using the --cpu-freq option. Data Generic data structure details. DBD_Agent RPC agent (outgoing RPCs to the DBD) Dependency Job dependency debug info Elasticsearch Elasticsearch debug info (deprecated). Alias of JobComp. Energy AcctGatherEnergy debug info Federation Federation scheduling debug info Gres Generic resource details Hetjob Heterogeneous job details Gang Gang scheduling details GLOB_SILENCE Do not display error message of glob "*" sym- bols in conf files. JobAccountGather Common job account gathering details (not plu- gin specific). JobComp Job Completion plugin details License License management details Namespace Namespace plugin details Metrics Metrics plugin details Network Network details. Warning: activating this flag may cause logging of passwords, tokens or other authentication credentials. NetworkRaw Dump raw hex values of key Network communica- tions. Warning: This flag will cause very ver- bose logs and may cause logging of passwords, tokens or other authentication credentials. NodeFeatures Node Features plugin debug info NO_CONF_HASH Do not log when the slurm.conf files differ be- tween Slurm daemons Power Power management plugin and power save (sus- pend/resume programs) details Priority Job prioritization Profile AcctGatherProfile plugins details Protocol Communication protocol details Reservation Advanced reservations Route Message forwarding debug info Script Debug info regarding any script called by Slurm. This includes slurmctld executed scripts such as PrologSlurmctld and EpilogSlurmctld. SelectType Resource selection plugin Steps Slurmctld resource allocation for job steps Switch Switch plugin TLS TLS plugin TraceJobs Trace jobs in slurmctld. It will print detailed job information including state, job ids and allocated nodes counter. Triggers Slurmctld triggers DefCpuPerGPU Default count of CPUs allocated per allocated GPU. This value is used only if the job didn't specify --cpus-per-task and --cpus-per-gpu. DefMemPerCPU Default real memory size available per usable allocated CPU in megabytes. Used to avoid over-subscribing memory and causing paging. DefMemPerCPU would generally be used if individual processors are allocated to jobs (SelectType=select/cons_tres). The default value is 0 (unlimited). Also see DefMemPerGPU, DefMemPerNode and MaxMemPerCPU. DefMemPerCPU, DefMemPerGPU and DefMemPerNode are mutually exclusive. NOTE: This applies to usable allocated CPUs in a job allocation. This is important when more than one thread per core is config- ured. If a job requests --threads-per-core with fewer threads on a core than exist on the core (or --hint=nomultithread which implies --threads-per-core=1), the job will be unable to use those extra threads on the core and those threads will not be included in the memory per CPU calculation. But if the job has access to all threads on the core, those threads will be in- cluded in the memory per CPU calculation even if the job did not explicitly request those threads. In the following examples, each core has two threads. In this first example, two tasks can run on separate hyper- threads in the same core because --threads-per-core is not used. The third task uses both threads of the second core. The allo- cated memory per cpu includes all threads: $ salloc -n3 --mem-per-cpu=100 salloc: Granted job allocation 17199 $ sacct -j $SLURM_JOB_ID -X -o jobid%7,reqtres%35,alloctres%35 JobID ReqTRES AllocTRES ------- ----------------------------------- ----------------------------------- 17199 billing=3,cpu=3,mem=300M,node=1 billing=4,cpu=4,mem=400M,node=1 In this second example, because of --threads-per-core=1, each task is allocated an entire core but is only able to use one thread per core. Allocated CPUs includes all threads on each core. However, allocated memory per cpu includes only the usable thread in each core. $ salloc -n3 --mem-per-cpu=100 --threads-per-core=1 salloc: Granted job allocation 17200 $ sacct -j $SLURM_JOB_ID -X -o jobid%7,reqtres%35,alloctres%35 JobID ReqTRES AllocTRES ------- ----------------------------------- ----------------------------------- 17200 billing=3,cpu=3,mem=300M,node=1 billing=6,cpu=6,mem=300M,node=1 DefMemPerGPU Default real memory size available per allocated GPU in megabytes. The default value is 0 (unlimited). Please note a best effort attempt is made to predict which GPUs on the system will be used, but this could change between job submission and start time, causing MaxMemPerNode to potentially not work as ex- pected for heterogeneous jobs. Also see DefMemPerCPU and DefMemPerNode. DefMemPerCPU, DefMemPerGPU and DefMemPerNode are mutually exclusive. DefMemPerNode Default real memory size available per allocated node in megabytes. Used to avoid over-subscribing memory and causing paging. DefMemPerNode would generally be used if whole nodes are allocated to jobs (SelectType=select/linear) and resources are over-subscribed (OverSubscribe=yes or OverSubscribe=force). The default value is 0 (unlimited). Also see DefMemPerCPU, DefMemPerGPU and MaxMemPerCPU. DefMemPerCPU, DefMemPerGPU and DefMemPerNode are mutually exclusive. DependencyParameters Multiple options may be comma separated. disable_remote_singleton By default, when a federated job has a singleton depen- dency, each cluster in the federation must clear the sin- gleton dependency before the job's singleton dependency is considered satisfied. Enabling this option means that only the origin cluster must clear the singleton depen- dency. This option must be set in every cluster in the federation. kill_invalid_depend If a job has an invalid dependency and it can never run terminate it and set its state to be JOB_CANCELLED. By default the job stays pending with reason DependencyNev- erSatisfied. max_depend_depth=Maximum number of jobs to test for a circular job dependency. Stop testing after this number of job dependencies have been tested. The default value is 10 jobs. DisableRootJobs If set to "YES" then user root will be prevented from running any jobs. The default value is "NO", meaning user root will be able to execute jobs. DisableRootJobs may also be set by parti- tion. EioTimeout The number of seconds srun waits for slurmstepd to close the TCP/IP connection used to relay data between the user applica- tion and srun when the user application terminates. The default value is 60 seconds. May not exceed 65533. EnforcePartLimits Controls whether partition limits are enforced when a job is submitted to the cluster. The partition limits being considered by this option are its configured MaxMemPerCPU, MaxMemPerNode, MinNodes, MaxNodes, MaxTime, AllocNodes, AllowAccounts, Allow- Groups, AllowQOS, and QOS usage threshold. It also considers if the job requests more nodes than exist in the partition. If set, then a job and job QOS cannot be submitted that exceed partition limits. ALL Jobs which exceed the number of nodes in a partition and/or any of its configured limits will be rejected at submission time. If the job is submitted to multiple par- titions, the job must satisfy the limits on all the re- quested partitions. ANY Jobs will be accepted if they satisfy the limits on at least one of the requested partitions. NO Partition limits will not be enforced at submit time, but will still be enforced during scheduling. This includes jobs that request more nodes than exist in any of the partition, so jobs can be submitted to empty partitions. A job that exceeds the limits on all requested partitions will remain queued until the partition limits are al- tered. This is the default. Epilog Pathname of a script to execute as user root on every node when a user's job completes (e.g. "/usr/local/slurm/epilog"). If it is not an absolute path name (i.e. it does not start with a slash), it will be searched for in the same directory as the slurm.conf file. A glob pattern (See glob (7)) may also be used to run more than one epilog script (e.g. "/etc/slurm/epi- log.d/*"). When more than one epilog script is configured, they are executed in reverse alphabetical order (z-a -> Z-A -> 9-0). The Epilog script(s) may be used to purge files, disable user login, etc. By default there is no epilog. See Prolog and Epi- log Scripts for more information. NOTE: It is possible to configure multiple epilog scripts by in- cluding this option on multiple lines. EpilogMsgTime The number of microseconds that the slurmctld daemon requires to process an epilog completion message from the slurmd daemons. This parameter can be used to prevent a burst of epilog comple- tion messages from being sent at the same time which should help prevent lost messages and improve throughput for large jobs. The default value is 2000 microseconds. For a 1000 node job, this spreads the epilog completion messages out over two sec- onds. EpilogSlurmctld Fully qualified pathname of a program for the slurmctld to exe- cute upon termination of a job allocation (e.g. "/usr/lo- cal/slurm/epilog_controller"). The program executes as Slur- mUser, which gives it permission to drain nodes and requeue the job if a failure occurs (See scontrol(1)). Exactly what the program does and how it accomplishes this is completely at the discretion of the system administrator. Information about the job being initiated, its allocated nodes, etc. are passed to the program using environment variables. See Prolog and Epilog Scripts for more information. NOTE: It is possible to configure multiple epilog scripts by in- cluding this option on multiple lines. EpilogTimeout The interval in seconds Slurm waits for Epilog before terminat- ing them. The default value is PrologEpilogTimeout. This inter- val applies to the Epilog run by slurmd daemon after the job, the EpilogSlurmctld run by slurmctld daemon, and the SPANK plu- gin epilog call: slurm_spank_job_epilog. If the Epilog or slurm_spank_job_epilog time out, the node is drained. In all cases, errors are logged. FairShareDampeningFactor Dampen the effect of exceeding a user or group's fair share of allocated resources. Higher values will provides greater ability to differentiate between exceeding the fair share at high levels (e.g. a value of 1 results in almost no difference between over- consumption by a factor of 10 and 100, while a value of 5 will result in a significant difference in priority). The default value is 1. FederationParameters Used to define federation options. Multiple options may be comma separated. fed_display If set, then the client status commands (e.g. squeue, sinfo, sprio, etc.) will display information in a feder- ated view by default. This option is functionally equiva- lent to using the --federation options on each command. Use the client's --local option to override the federated view and get a local view of the given cluster. Allow client commands to use the --cluster option even when the slurmdbd is down by retrieving cluster records from slurmctld instead. FirstJobId The job id to be used for the first job submitted to Slurm. Job id values generated will incremented by 1 for each subsequent job. Value must be larger than 0. The default value is 1. Also see MaxJobId GresTypes A comma-delimited list of generic resources to be managed (e.g. GresTypes=gpu,mps). These resources may have an associated GRES plugin of the same name providing additional functionality. No generic resources are managed by default. Ensure this parameter is consistent across all nodes in the cluster for proper opera- tion. GroupUpdateForce If set to a non-zero value, then information about which users are members of groups allowed to use a partition will be updated periodically, even when there have been no changes to the /etc/group file. If set to zero, group member information will be updated only after the /etc/group file is updated. The de- fault value is 1. Also see the GroupUpdateTime parameter. GroupUpdateTime Controls how frequently information about which users are mem- bers of groups allowed to use a partition will be updated, and how long user group membership lists will be cached. The time interval is given in seconds with a default value of 600 sec- onds. A value of zero will prevent periodic updating of group membership information. Also see the GroupUpdateForce parame- ter. GpuFreqDef=[<type]=value>[,<type=value>] Default GPU frequency to use when running a job step if it has not been explicitly set using the --gpu-freq option. This op- tion can be used to independently configure the GPU and its mem- ory frequencies. There is no default value. If unset, no at- tempt to change the GPU frequency is made if the --gpu-freq op- tion has not been set. After the job is completed, the frequen- cies of all affected GPUs will be reset to the highest possible values. In some cases, system power caps may override the re- quested values. The field type can be "memory". If type is not specified, the GPU frequency is implied. The value field can either be "low", "medium", "high", "highm1" or a numeric value in megahertz (MHz). If the specified numeric value is not pos- sible, a value as close as possible will be used. See below for definition of the values. Examples of use include "GpuFre- qDef=medium,memory=high and "GpuFreqDef=450". Supported value definitions: low the lowest available frequency. medium attempts to set a frequency in the middle of the available range. high the highest available frequency. highm1 (high minus one) will select the next highest avail- able frequency. HashPlugin Identifies the type of hash plugin to use for network communica- tion. Acceptable values include: hash/k12 Hashes are generated by the KangorooTwelve cryp- tographic hash function. This is the default. hash/sha3 Hashes are generated by the SHA-3 cryptographic hash function. NOTE: Make sure that HashPlugin has the same value both in slurm.conf and in slurmdbd.conf. HealthCheckInterval The interval in seconds between executions of HealthCheckPro- gram. The default value is zero, which disables execution. HealthCheckNodeState Identify what node states should execute the HealthCheckProgram. Multiple state values may be specified with a comma separator. The default value is ANY to execute on nodes in any state. ALLOC Run on nodes in the ALLOC state (all CPUs allo- cated). ANY Run on nodes in any state. CYCLE Rather than running the health check program on all nodes at the same time, cycle through running on all compute nodes through the course of the HealthCheck- Interval. May be combined with the various node state options. IDLE Run on nodes in the IDLE state. NONDRAINED_IDLE Run on nodes that are in the IDLE state and not DRAINED. MIXED Run on nodes in the MIXED state (some CPUs idle and other CPUs allocated). START_ONLY Run only at slurmd startup. HealthCheckProgram Fully qualified pathname of a script to execute as user root pe- riodically on all compute nodes that are not in the NOT_RESPOND- ING state. This program may be used to verify the node is fully operational and DRAIN the node or send email if a problem is de- tected. Any action to be taken must be explicitly performed by the program (e.g. execute "scontrol update NodeName=foo State=drain Reason=tmp_file_system_full" to drain a node). The execution interval is controlled using the HealthCheckInterval parameter. Note that the HealthCheckProgram will be executed at the same time on all nodes to minimize its impact upon parallel programs. This program will be killed if it does not terminate normally within 60 seconds. This program will also be executed when the slurmd daemon is first started and before it registers with the slurmctld daemon. If HealthCheckNodeState is START_ONLY it will be executed only when the slurmd daemon is first started. By default, no program will be executed. HttpParserType Specify the http_parser implementation that will be used. De- fault is http_parser/libhttp_parser. Acceptable values at present: http_parser/libhttp_parser Use the libhttp_parser based plugin. InactiveLimit The interval, in seconds, after which a non-responsive job allo- cation command (e.g. srun or salloc) will result in the job be- ing terminated. If the node on which the command is executed fails or the command abnormally terminates, this will terminate its job allocation. This option has no effect upon batch jobs. When setting a value, take into consideration that a debugger using srun to launch an application may leave the srun command in a stopped state for extended periods of time. This limit is ignored for jobs running in partitions with the RootOnly flag set (the scheduler running as root will be responsible for the job). The default value is unlimited (zero) and may not exceed 65533 seconds. InteractiveStepOptions When LaunchParameters=use_interactive_step is enabled, launching salloc will automatically start an srun process with Interac- tiveStepOptions to launch a terminal on a node in the job allo- cation. The default value is "--interactive --preserve-env --pty $SHELL". The "--interactive" option is intentionally not documented in the srun man page. It is meant only to be used in InteractiveStepOptions in order to create an "interactive step" that will not consume resources so that other steps may run in parallel with the interactive step. JobAcctGatherType The JobAcctGather plugin collects memory, cpu, io, interconnect, energy and gpu usage information at the task level, depending on which plugins are configured in Slurm. This parameter will con- trol how some of these metrics will be collected. Unset by de- fault. Configurable values at present are: jobacct_gather/cgroup (recommended) Collect cpu and memory statistics by reading the task's cgroup directory interfaces (e.g. memory.stat, cpu.stat) by issuing a call to the configured CgroupPlugin (see "man cgroup.conf"). This mechanism ignores JobAcctGatherParams=UsePSS or NoShared since these are used only when reading memory us- age from the proc filesystem. jobacct_gather/linux Collect cpu and memory statistics by reading procfs. The plugin will take all the pids of the task and for each of them will read /proc/<pid>/stats. If UsePSS is set it will also read /proc/<pid>/smaps, and if NoShare is set it will also read /proc/<pid>/statm (see JobAcctGatherParams for more informa- tion). This plugin carries a performance penalty on jobs with a large number of spawned processes since it needs to iterate over all the task pids and aggregate the stats into one single metric for the ppid, and then these values need to be aggregated to the task stats. NOTE: Changing the plugin type when jobs are running in the cluster is possible. The already running steps will keep using the previous plugin mechanism, while new steps will use the new mechanism. JobAcctGatherFrequency The job accounting and profiling sampling intervals, specified for each data type. Multiple comma-separated <datatype>=<inter- val> intervals may be specified. If an interval is provided without a datatype, it will be assigned to the task datatype. Supported datatypes are as follows: Affects accounting and profiling: task=<interval> sampling interval in seconds for task usage by the jobacct_gather plugins and for task profiling by the acct_gather_profile plugin. Defaults to 30. If this interval is 0 (disabled), accounting information is collected only at job termina- tion, which reduces Slurm interference with the job, but also means that the statistics about a job are only derived from a single sample and don't reflect the average or maxi- mum of several samples throughout the life of the job. Affects profiling only: energy=<interval> sampling interval in seconds for energy pro- filing using the acct_gather_energy plugin. Defaults to 0 (disabled). network=<interval> sampling interval in seconds for infiniband profiling using the acct_gather_interconnect plugin. Defaults to 0 (disabled). filesystem=<interval> sampling interval in seconds for filesystem profiling using the acct_gather_filesystem plugin. Defaults to 0 (disabled). Smaller (non-zero) values have a greater impact upon job perfor- mance, but a value of 30 seconds is not likely to be noticeable for applications having less than 10,000 tasks. Users can independently override each interval on a per job ba- sis using the --acctg-freq option when submitting the job. This value should be lower or equal to EnergyIPMIFreq when using acct_gather_energy/ipmi or xcc plugins as otherwise it will un- necessarily get repeated values on successive polls. JobAcctGatherParams Arbitrary parameters for the job account gather plugin. Accept- able values at present include: NoShared Exclude shared memory from RSS. This option cannot be used with UsePSS. Only compatible with jobacct_gather/linux plugin. UsePss Use PSS value instead of RSS to calculate real usage of memory. The PSS value will be saved as RSS. This option cannot be used with NoShared. Only compatible with jobacct_gather/linux plugin. OverMemoryKill Kill processes that are being detected to use more memory than requested by steps every time accounting information is gath- ered by the JobAcctGather plugin. This pa- rameter should be used with caution because a job exceeding its memory allocation may affect other processes and/or machine health. NOTE: If available, it is recommended to limit memory by enabling task/cgroup as a TaskPlugin and making use of ConstrainRAM- Space=yes in the cgroup.conf instead of us- ing this JobAcctGather mechanism for memory enforcement. Using JobAcctGather is polling based and there is a delay before a job is killed, which could lead to system Out of Memory events. NOTE: When using OverMemoryKill, if the com- bined memory used by all the processes in a step exceeds the memory limit, the entire step will be killed/cancelled by the JobAc- ctGather plugin. This differs from the be- havior when using ConstrainRAMSpace, where processes in the step will be killed, but the step will be left active, possibly with other processes left running. DisableGPUAcct Do not do accounting of GPU usage and skip any gpu driver library call. This parameter can help to improve performance if the GPU driver response is slow. JobCompHost The name of the machine hosting the job completion database. Only used for database type storage plugins, ignored otherwise. JobCompLoc This option sets a string which has different meanings depending on JobCompType: If jobcomp/elasticsearch: Instructs this plugin to send the finished job records information to the Elasticsearch server URL endpoint (in- cluding the port number and the target index) configured in this option. This string should typically take the form of <host>:<port>/<target>/_doc. There is no default value for JobCompLoc when this plugin is enabled. NOTE: Refer to <https://slurm.schedmd.com/elastic- search.html> for more information. If jobcomp/filetxt: Instructs this plugin to send the finished job records information to a file configured in this option. This string should represent an absolute path to a file. The default value for this plugin is /var/log/slurm_job- comp.log. If jobcomp/kafka: When this plugin is configured, finished (and optionally start running) job records information is sent to a Kafka server. The plugin makes use of librdkafka. This string represents an absolute path to a file containing key=value pairs configuring the library behavior. For the plugin to work properly, this file needs to exist and least the bootstrap.servers librdkafka property needs to be configured in it. There is no default value for Job- CompLoc when this plugin is enabled. NOTE: For a full list of librdkafka properties, please refer to the library documentation. You can also view the jobcomp_kafka page for more information: <https://slurm.schedmd.com/jobcomp_kafka.html> NOTE: The target Kafka topic(s) and other plugin parame- ters can be configured via JobCompParams. If jobcomp/lua: This option is ignored in this plugin. The finished job record is processed by a hardcoded jobcomp.lua script ex- pected to be located in the same location of slurm.conf. There is no default value for JobCompLoc when this plugin is enabled. If jobcomp/mysql: Instructs this plugin to send the finished job records information to a database name configured in this option. This string should represent a database name. The de- fault value for this plugin is slurm_jobcomp_db. If jobcomp/script: The finished job record information is made available via environment variables and processed by a script with name configured by this option. This string should represent a path to a script. There is no default value for JobCom- pLoc when this plugin is enabled. It needs to be explic- itly configured or the plugin will fail to initialize. JobCompParams Pass arbitrary text string to job completion plugin. Also see JobCompType. Optional comma-separated list for jobcomp/elasticsearch: send_script Sends the job script as part of jobcomp messages. Optional comma-separated list for jobcomp/kafka: enable_job_start Instruct the jobcomp/kafka plugin to send a subset of the job record fields to the topic_job_start Kafka topic when a job first starts running. NOTE: The writing when the job finishes (histori- cal purpose of the plugin) is always enabled by default and can't be disabled. NOTE: The subset of fields for job start events is slightly smaller than those sent when the job fin- ishes. flush_timeout=<milliseconds> Maximum time (in milliseconds) to wait for all outstanding produce requests, et.al, to be com- pleted. This is passed as a timeout argument to the librdkafka flush API function, called on plu- gin termination. This is done prior to destroying the producer instance to make sure all queued and in-flight produce requests are completed before terminating. For non-blocking calls, set to 0. To wait indefinitely for an event, set to -1 (not recommended, since this is called on plugin fini and could block slurmctld graceful termination). Accepted values are [-1,2147483647]. Defaults to 500 (milliseconds). poll_interval=<seconds> Seconds between calls to librdkafka API poll func- tion, which polls the provided Kafka handle for events. The plugin spawns a separate thread to perform this call at the configured interval. Ac- cepted values are [0,4294967295]. Defaults to 2 (seconds). requeue_on_msg_timeout Instruct the delivery report callback to requeue messages that failed delivery because their time waiting for successful delivery reached the librd- kafka property message.timeout.ms. Defaults to not set (don't requeue and thus discard these mes- sages). send_script Sends the job script as part of jobcomp messages. topic=<string> Target Kafka topic to send messages to when a job finishes. Defaults to ClusterName. topic_job_start=<string> Target Kafka topic to send messages to when a job starts running. Defaults to <ClusterName>-job- start. NOTE: It is advisable that job start running event records be sent to a different Kafka topic than the topic configured for job finish event records. Optional comma-separated list for jobcomp/mysql: token_duration Duration in seconds to cache generated database passwords before requesting a new one from the StoragePassScript. Typically the token should re- fresh prior to actual expiration; upon token gen- eration failure the cached token will continue to be used to avoid transient generation failures from causing connection failures. Default value is 300 seconds (5 minutes). JobCompPass The password used to gain access to the database to store the job completion data. Only used for database type storage plug- ins, ignored otherwise. JobCompPassScript Absolute path to an executable script that generates ephemeral authentication tokens for database connections which are used instead of JobCompPass. The script must output the password/to- ken to stdout and exit with status 0 on success. This allows dy- namic password generation, instead of storing static credentials in configuration files. The script must be owned and executable by SlurmUser. Environment variables provided to the script: SLURM_STORAGE_HOSTNAME Database hostname SLURM_STORAGE_PORT Database port number SLURM_STORAGE_USER Database username Expected output format: TOKEN=<authentication_token> The script must exit with status 0 on success, non-zero on fail- ure. Any output to stderr will be logged as an error. If there is a backup host specified, the script will still be provided the main hostname and the same token is used for both hosts. JobCompPort The listening port of the job completion database server. Only used for database type storage plugins, ignored otherwise. JobCompType The job completion logging mechanism type. Unset by default. Acceptable values at present include: jobcomp/elasticsearch Upon job completion, a record of the job should be writ- ten to an Elasticsearch server, specified by the JobCom- pLoc parameter. NOTE: More information is available at the Slurm web site ( https://slurm.schedmd.com/elasticsearch.html ). jobcomp/filetxt Upon job completion, a record of the job should be writ- ten to a text file, specified by the JobCompLoc parame- ter. jobcomp/kafka Upon job completion (or optionally job start running), a record of the job should be sent to a Kafka server, spec- ified by the file path referenced in JobCompLoc and/or using other JobCompParams. jobcomp/lua Upon job completion, a record of the job should be processed by the jobcomp.lua script, located in the de- fault script directory (typically the subdirectory etc of the installation directory. jobcomp/mysql Upon job completion, a record of the job should be writ- ten to a MySQL or MariaDB database, specified by the Job- CompLoc parameter. jobcomp/script Upon job completion, a script specified by the JobCompLoc parameter is to be executed with environment variables providing the job information. JobCompUser The user account for accessing the job completion database. Only used for database type storage plugins, ignored otherwise. JobFileAppend This option controls what to do if a job's output or error file exist when the job is started. If JobFileAppend is set to a value of 1, then append to the existing file. By default, any existing file is truncated. JobRequeue This option controls the default ability for batch jobs to be requeued. Jobs may be requeued explicitly by a system adminis- trator, after node failure, or upon preemption by a higher pri- ority job. If JobRequeue is set to a value of 1, then batch jobs may be requeued unless explicitly disabled by the user. If JobRequeue is set to a value of 0, then batch jobs will not be requeued unless explicitly enabled by the user. Use the sbatch --no-requeue or --requeue option to change the default behavior for individual jobs. The default value is 1. JobSubmitPlugins These are intended to be site-specific plugins which can be used to set default job parameters and/or logging events. Slurm can be configured to use multiple job_submit plugins if desired, which must be specified as a comma-delimited list and will be executed in the order listed. e.g. for multiple job_submit plugin configuration: JobSubmitPlugins=lua,require_timelimit Take a look at <https://slurm.schedmd.com/job_submit_plug- ins.html> for further plugin implementation details. No job sub- mission plugins are used by default. Currently available plug- ins are: all_partitions Set default partition to all partitions on the cluster. defaults Set default values for job submission or modify requests. logging Log select job submission and modifica- tion parameters. lua Execute a Lua script implementing site's own job_submit logic. Only one Lua script will be executed. It must be named "job_submit.lua" and must be lo- cated in the default configuration di- rectory (typically the subdirectory "etc" of the installation directory). Sample Lua scripts can be found with the Slurm distribution, in the directory contribs/lua. Slurmctld will fatal on startup if the configured lua script is invalid. Slurm will try to load the script for each job submission. If the script is broken or removed while slurm- ctld is running, Slurm will fallback to the previous working version of the script. Warning: slurmctld runs this script while holding internal locks, and only a single copy of this script can run at a time. This blocks most concur- rency in slurmctld. Therefore, this script should run to completion as quickly as possible. partition Set a job's default partition based upon job submission parameters and available partitions. pbs Translate PBS job submission options to Slurm equivalent (if possible). require_timelimit Force job submissions to specify a time- limit. NOTE: For examples of use see the Slurm code in "src/plug- ins/job_submit" and "contribs/lua/job_submit*.lua" then modify the code to satisfy your needs. KillOnBadExit If set to 1, a step will be terminated immediately if any task is crashed or aborted, as indicated by a non-zero exit code. With the default value of 0, if one of the processes is crashed or aborted the other processes will continue to run while the crashed or aborted process waits. The user can override this configuration parameter by using srun's -K, --kill-on-bad-exit. KillWait The interval, in seconds, given to a job's processes between the SIGTERM and SIGKILL signals upon reaching its time limit. If the job fails to terminate gracefully in the interval specified, it will be forcibly terminated. The default value is 30 sec- onds. The value may not exceed 65533. MaxBatchRequeue Maximum number of times a batch job may be automatically re- queued before being marked as JobHeldAdmin. (Mainly useful when the SchedulerParameters option nohold_on_prolog_fail is en- abled.) The default value is 5. NodeFeaturesPlugins Identifies the plugins to be used for support of node features which can change through time. For example, a node which might be booted with various BIOS setting. This is supported through the use of a node's active_features and available_features in- formation. Acceptable values at present include: node_features/helpers Used to report and modify features on nodes using arbi- trary scripts or programs. See helpers.conf man page for more information: https://slurm.schedmd.com/helpers.conf.html LaunchParameters Identifies options to the job launch plugin. Acceptable values include: batch_step_set_cpu_freq Set the cpu frequency for the batch step from given --cpu-freq, or slurm.conf CpuFreqDef, option. By default only steps started with srun will utilize the cpu freq setting options. NOTE: If you are using srun to launch your steps inside a batch script (ad- vised) this option will create a situa- tion where you may have multiple agents setting the cpu_freq as the batch step usually runs on the same resources one or more steps the sruns in the script will create. interactive_step_set_cpu_freq Set the cpu frequency for the interac- tive step from given --cpu-freq, or slurm.conf CpuFreqDef, options. cray_net_exclusive Allow jobs on a Cray XC cluster exclu- sive access to network resources. This should only be set on clusters providing exclusive access to each node to a sin- gle job at once, and not using parallel steps within the job, otherwise re- sources on the node can be oversub- scribed. enable_nss_slurm Permits passwd and group resolution for a job to be serviced by slurmstepd rather than requiring a lookup from a network based service. See https://slurm.schedmd.com/nss_slurm.html for more information. lustre_no_flush If set on a Cray XC cluster, then do not flush the Lustre cache on job step com- pletion. This setting will only take ef- fect after reconfiguring, and will only take effect for newly launched jobs. mem_sort Sort NUMA memory at step start. User can override this default with SLURM_MEM_BIND environment variable or --mem-bind=nosort command line option. mpir_use_nodeaddr When launching tasks Slurm creates en- tries in MPIR_proctable that are used by parallel debuggers, profilers, and re- lated tools to attach to running process. By default the MPIR_proctable entries contain MPIR_procdesc structures where the host_name is set to NodeName by default. If this option is specified, NodeAddr will be used in this context instead. disable_send_gids By default, the slurmctld will look up and send the user_name and extended gids for a job, rather than independently on each node as part of each task launch. This helps mitigate issues around name service scalability when launching jobs involving many nodes. Using this option will disable this functionality. This option is ignored if enable_nss_slurm is specified. slurmstepd_memlock Lock the slurmstepd process's current memory in RAM. slurmstepd_memlock_all Lock the slurmstepd process's current and future memory in RAM. test_exec Have srun verify existence of the exe- cutable program along with user execute permission on the node where srun was called before attempting to launch it on nodes in the step. use_interactive_step Have salloc use the Interactive Step to launch a shell on an allocated compute node rather than locally to wherever salloc was invoked. This is accomplished by launching the srun command with In- teractiveStepOptions as options. This does not affect salloc called with a command as an argument. These jobs will continue to be executed as the calling user on the calling host. ulimit_pam_adopt When pam_slurm_adopt is used to join an external process into a job cgroup, RLIMIT_RSS is set, as is done for tasks running in regular steps. Licenses Specification of licenses (or other resources available on all nodes of the cluster) which can be allocated to jobs. License names can optionally be followed by a colon and count with a de- fault count of one. Multiple license names should be comma sep- arated (e.g. "Licenses=foo:4,bar"). Note that Slurm prevents jobs from being scheduled if their required license specifica- tion is not available. Slurm does not prevent jobs from using licenses that are not explicitly listed in the job submission specification. LogTimeFormat Format of the timestamp in slurmctld and slurmd log files. Ac- cepted format values include "iso8601", "iso8601_ms", "rfc5424", "rfc5424_ms", "rfc3339", "clock", "short" and "thread_id". The values ending in "_ms" differ from the ones without in that fractional seconds with millisecond precision are printed. The default value is "iso8601_ms". The "rfc5424" formats are the same as the "iso8601" formats except that the timezone value is also shown. The "clock" format shows a timestamp in microsec- onds retrieved with the C standard clock() function. The "short" format is a short date and time format. The "thread_id" format shows the timestamp in the C standard ctime() function form without the year but including the microseconds, the daemon's process ID and the current thread name and ID. MailDomain Domain name to qualify usernames if email address is not explic- itly given with the "--mail-user" option. If unset, the local MTA will need to qualify local address itself. Changes to Mail- Domain will only affect new jobs. MailProg Fully qualified pathname to the program used to send email per user request. The default value is "/bin/mail" (or "/usr/bin/mail" if "/bin/mail" does not exist but "/usr/bin/mail" does exist). The program is called with argu- ments suitable for the default mail command, however additional information about the job is passed in the form of environment variables. Additional variables are the same as those passed to Pro- logSlurmctld and EpilogSlurmctld with additional variables in the following contexts: ALL SLURM_JOB_STATE The base state of the job when the MailProg is called. SLURM_JOB_MAIL_TYPE The mail type triggering the mail. BEGIN SLURM_JOB_QEUEUED_TIME The amount of time the job was queued. END, FAIL, REQUEUE, TIME_LIMIT_* SLURM_JOB_RUN_TIME The amount of time the job ran for. END, FAIL SLURM_JOB_EXIT_CODE_MAX Job's exit code or highest exit code for an array job. SLURM_JOB_EXIT_CODE_MIN Job's minimum exit code for an array job. SLURM_JOB_TERM_SIGNAL_MAX Job's highest signal for an array job. STAGE_OUT SLURM_JOB_STAGE_OUT_TIME Job's staging out time. MaxArraySize The maximum job array task index value will be one less than MaxArraySize to allow for an index value of zero. Configure MaxArraySize to 0 in order to disable job array use. The value may not exceed 4000001. The value of MaxJobCount should be much larger than MaxArraySize, since each job array task still counts as a separate job (see MaxJobCount for further details). The default value is 1001. See also max_array_tasks in SchedulerPa- rameters. MaxDBDMsgs When communication to the SlurmDBD is not possible the slurmctld will queue messages meant to processed when the SlurmDBD is available again. In order to avoid running out of memory the slurmctld will only queue so many messages. The default value is 10000, or MaxJobCount * 2 + Node Count * 4, whichever is greater. The value can not be less than 10000. MaxJobCount The maximum number of jobs slurmctld can have in memory at one time. Combine with MinJobAge to ensure the slurmctld daemon does not exhaust its memory or other resources. Once this limit is reached, requests to submit additional jobs will fail. The default value is 10000 jobs. NOTE: Each task of a job array counts as one job even though they will not occupy separate job records until modified or initiated. Performance can suffer with more than a few hundred thousand jobs. Setting MaxSub- mitJobs per user is generally valuable to prevent a single user from filling the system with jobs. This is accomplished using Slurm's database and configuring enforcement of resource limits. MaxJobId The maximum job id to be used for jobs submitted to Slurm with- out a specific requested value. Job ids are unsigned 32bit inte- gers with the first 26 bits reserved for local job ids and the remaining 6 bits reserved for a cluster id to identify a feder- ated job's origin. The maximum allowed local job id is 67,108,863 (0x3FFFFFF). The default value is 67,043,328 (0x03ff0000). MaxJobId only applies to the local job id and not the federated job id. Job id values generated will be incre- mented by 1 for each subsequent job. Once MaxJobId is reached, the next job will be assigned FirstJobId. Federated jobs will always have a job ID of 67,108,865 or higher. Also see FirstJo- bId. MaxMemPerCPU Maximum real memory size available per allocated CPU in megabytes. Used to avoid over-subscribing memory and causing paging. MaxMemPerCPU would generally be used if individual processors are allocated to jobs (SelectType=select/cons_tres). The default value is 0 (unlimited). Also see DefMemPerCPU, DefMemPerGPU and MaxMemPerNode. MaxMemPerCPU and MaxMemPerNode are mutually exclusive. NOTE: If a job specifies a memory per CPU limit that exceeds this system limit, that job's count of CPUs per task will try to automatically increase. This may result in the job failing due to CPU count limits. This auto-adjustment feature is a best-ef- fort one and optimal assignment is not guaranteed due to the possibility of having heterogeneous configurations and multi-partition/qos jobs. If this is a concern it is advised to use a job submit LUA plugin instead to enforce auto-adjustments to your specific needs. MaxMemPerNode Maximum real memory size available per allocated node in a job allocation in megabytes. Used to avoid over-subscribing memory and causing paging. MaxMemPerNode would generally be used if whole nodes are allocated to jobs (SelectType=select/linear) and resources are over-subscribed (OverSubscribe=yes or OverSub- scribe=force). The default value is 0 (unlimited). Also see DefMemPerNode and MaxMemPerCPU. MaxMemPerCPU and MaxMemPerNode are mutually exclusive. MaxNodeCount Maximum count of nodes which may exist in the controller. By de- fault MaxNodeCount will be set to the number of nodes found in the slurm.conf. MaxNodeCount will be ignored if less than the number of nodes found in the slurm.conf. The total number of nodes in a system cannot exceed 65536. Increase MaxNodeCount to accommodate dynamically created nodes with dynamic node regis- trations and nodes created with scontrol. MaxStepCount The maximum number of steps that any job can initiate. This pa- rameter is intended to limit the effect of bad batch scripts. The default value is 40000 steps. MaxTasksPerNode Maximum number of tasks Slurm will allow a job step to spawn on a single node. The default MaxTasksPerNode is 512. May not ex- ceed 65533. MCSParameters MCS = Multi-Category Security MCS Plugin Parameters. The sup- ported parameters are specific to the MCSPlugin. Changes to this value take effect when the Slurm daemons are reconfigured. More information about MCS is available here <https://slurm.schedmd.com/mcs.html>. MCSPlugin MCS = Multi-Category Security : associate a security label to jobs and ensure that nodes can only be shared among jobs using the same security label. Unset by default. Acceptable values include: mcs/account only users with the same account can share the nodes (requires enabling of accounting). mcs/group only users with the same group can share the nodes. mcs/user a node cannot be shared with other users. mcs/label only jobs with the same arbitrary label string can share nodes. MessageTimeout Time permitted for a round-trip communication to complete in seconds. Default value is 10 seconds. For systems with shared nodes, the slurmd daemon could be paged out and necessitate higher values. MetricsType Specify the metrics plugin to be used to dump statistics from the slurmctld socket. Gathering of metrics is disabled when Pri- vateData is set. Refer to the Metrics Guide for further details: <https://slurm.schedmd.com/metrics.html> Configurable values at present are: metrics/openmetrics Use the OpenMetrics based plugin. MinJobAge The minimum age of a completed job before its record is cleared from the list of jobs slurmctld keeps in memory. Combine with MaxJobCount to ensure the slurmctld daemon does not exhaust its memory or other resources. The default value is 300 seconds. A value of zero prevents any job record purging. Jobs are not purged during a backfill cycle, so it can take longer than Min- JobAge seconds to purge a job if using the backfill scheduling plugin. In order to eliminate some possible race conditions, the minimum non-zero value for MinJobAge recommended is 2. MpiDefault Identifies the default type of MPI to be used. Unset by de- fault, which allows Slurm to work with versions of MPI other than listed below. Srun may override this configuration parame- ter in any case. Currently supported versions include: pmi2 and pmix. More information about MPI use is available here <https://slurm.schedmd.com/mpi_guide.html>. MpiParams MPI-related parameters. Multiple parameters may be comma sepa- rated. Currently supported parameters include: ports=Identifies a range of communication ports used by native Cray's PMI. disable_slurm_hydra_bootstrap Disable environment variable injection in allocations for the following variables: I_MPI_HYDRA_BOOTSTRAP, I_MPI_HY- DRA_BOOTSTRAP_EXEC_EXTRA_ARGS, HYDRA_BOOTSTRAP, HY- DRA_LAUNCHER_EXTRA_ARGS. Manually setting I_MPI_HYDRA_BOOTSTRAP or HYDRA_BOOTSTRAP to 'slurm' in the allocation will skip this parameter and injection of extra args will be performed as usual. NamespaceType Identifies the plugin to be used for job isolation through name- spaces. To use these plugins, 'PrologFlags=Contain' must be set. NOTE: See ProctrackType for resource containment and usage tracking. Acceptable values at present include: namespace/tmpfs Used to create a private namespace on the filesystem for jobs, which houses temporary file systems (/tmp and /dev/shm) for each job. namespace/linux Used to create a private filesystem name- space and optionally user and pid name- spaces. The filesystem namespace houses tem- porary filesystems (/tmp and /dev/shm) for each job. NOTE: This plugin requires cgroup/v2 to operate correctly. NOTE: When using user namespaces, bpf token support (added in kernel 6.9) is required to use ConstrainDevices in cgroup.conf. OverTimeLimit Number of minutes by which a job can exceed its time limit be- fore being canceled. Normally a job's time limit is treated as a hard limit and the job will be killed upon reaching that limit. Configuring OverTimeLimit will result in the job's time limit being treated like a soft limit. Adding the OverTimeLimit value to the soft time limit provides a hard time limit, at which point the job is canceled. This is particularly useful for backfill scheduling, which bases upon each job's soft time limit. The default value is zero. May not exceed 65533 min- utes. A value of "UNLIMITED" is also supported. PluginDir Identifies the places in which to look for Slurm plugins. This is a colon-separated list of directories, like the PATH environ- ment variable. The default value is the prefix given at config- ure time + "/lib/slurm". PlugStackConfig Location of the config file for Slurm stackable plugins that use the Stackable Plugin Architecture for Node job (K)control (SPANK). This provides support for a highly configurable set of plugins to be called before and/or after execution of each task spawned as part of a user's job step. Default location is "plugstack.conf" in the same directory as the system slurm.conf. For more information on SPANK plugins, see the spank(8) manual. PreemptMode Mechanism used to preempt jobs or enable gang scheduling. When the PreemptType parameter is set to enable preemption, the Pre- emptMode selects the default mechanism used to preempt the eli- gible jobs for the cluster. PreemptMode may be specified on a per partition basis to over- ride this default value if PreemptType=preempt/partition_prio. Alternatively, it can be specified on a per QOS basis if Pre- emptType=preempt/qos. In either case, a valid default Preempt- Mode value must be specified for the cluster as a whole when preemption is enabled. The GANG option is used to enable gang scheduling independent of whether preemption is enabled (i.e. independent of the Preempt- Type setting). It can be specified in addition to a PreemptMode setting with the two options comma separated (e.g. Preempt- Mode=SUSPEND,GANG). See <https://slurm.schedmd.com/preempt.html> and <https://slurm.schedmd.com/gang_scheduling.html> for more de- tails. NOTE: For performance reasons, the backfill scheduler reserves whole nodes for jobs, not partial nodes. If during backfill scheduling a job preempts one or more other jobs, the whole nodes for those preempted jobs are reserved for the preemptor job, even if the preemptor job requested fewer resources than that. These reserved nodes aren't available to other jobs dur- ing that backfill cycle, even if the other jobs could fit on the nodes. Therefore, jobs may preempt more resources during a sin- gle backfill iteration than they requested. NOTE: For heterogeneous job to be considered for preemption all components must be eligible for preemption. When a heterogeneous job is to be preempted the first identified component of the job with the highest order PreemptMode (SUSPEND (highest), REQUEUE, CANCEL (lowest)) will be used to set the PreemptMode for all components. The GraceTime and user warning signal for each com- ponent of the heterogeneous job remain unique. Heterogeneous jobs are excluded from GANG scheduling operations. OFF Is the default value and disables job preemption and gang scheduling. It is only compatible with preemp- tion being disabled at the global level. A common use case for this parameter is to set it on a parti- tion to disable preemption for that partition. CANCEL The preempted job will be cancelled. GANG Enables gang scheduling (time slicing) of jobs in the same partition, and allows the resuming of sus- pended jobs. In order to use gang scheduling, the GANG option must be specified at the cluster level. NOTE: If GANG scheduling is enabled with Preempt- Type=preempt/partition_prio, the controller will ig- nore PreemptExemptTime and the following PreemptPa- rameters: reorder_count, strict_order, and youngest_first. NOTE: Gang scheduling is performed independently for each partition, so if you only want time-slicing by OverSubscribe, without any preemption, then config- uring partitions with overlapping nodes is not rec- ommended. On the other hand, if you want to use PreemptType=preempt/partition_prio to allow jobs from higher PriorityTier partitions to Suspend jobs from lower PriorityTier partitions you will need overlapping partitions, and PreemptMode=SUSPEND,GANG to use the Gang scheduler to resume the suspended jobs(s). You must configure the partition's OverSub- scribe setting to FORCE for all partitions in which time-slicing is to take place. In any case, time-slicing won't happen between jobs on different partitions. NOTE: Heterogeneous jobs are excluded from GANG scheduling operations. NOTE: In case of overlapping partitions. If the node is allocated job that allows sharing of resources (Oversubscribe=FORCE or Oversubscribe=YES and job was submitted with -s/--oversubscribe) it can only be allocated by jobs from the same partition. REQUEUE Preempts jobs by requeuing them (if possible) or canceling them. For jobs to be requeued they must have the --requeue sbatch option set or the cluster wide JobRequeue parameter in slurm.conf must be set to 1. SUSPEND The preempted jobs will be suspended, and later the Gang scheduler will resume them. Therefore the SUS- PEND preemption mode always needs the GANG option to be specified at the cluster level. Also, because the suspended jobs will still use memory on the allo- cated nodes, Slurm needs to be able to track memory resources to be able to suspend jobs. When suspending jobs, Slurm sends the SIGTSTP sig- nal, waits the time specified by PreemptParame- ters=suspend_grace_time (default is 2 seconds), then sends the SIGSTOP signal. The SIGCONT signal is sent when resuming jobs. If PreemptType=preempt/qos is configured and if the preempted job(s) and the preemptor job are on the same partition, then they will share resources with the Gang scheduler (time-slicing). If not (i.e. if the preemptees and preemptor are on different parti- tions) then the preempted jobs will remain suspended until the preemptor ends. NOTE: Because gang scheduling is performed indepen- dently for each partition, if using PreemptType=pre- empt/partition_prio then jobs in higher PriorityTier partitions will suspend jobs in lower PriorityTier partitions to run on the released resources. Only when the preemptor job ends will the suspended jobs will be resumed by the Gang scheduler. NOTE: Suspended jobs will not release GRES. Higher priority jobs will not be able to preempt to gain access to GRES. PRIORITY Allow preemption only if the preemptor's job prior- ity is higher than the preemptee's job priority. WITHIN For PreemptType=preempt/qos, allow jobs within the same qos to preempt one another. While this can be set globally here, it is recommend that this only be set directly on a relevant subset of the system qos values instead. PreemptParameters Multiple options may be comma separated. min_exempt_priority=Threshold value for the job's global prior- ity. Only those jobs with priority lower than this value will be marked as preemptable. reclaim_licenses If set, jobs may be preempted to reclaim licenses. Other- wise jobs requesting busy licenses will have to wait even if they have preemption priority. The logic to support this option is only available in the select/cons_tres plugin. Jobs that use OR in the license request are not eligible to preempt other jobs to reclaim licenses. reorder_count=Specify how many attempts should be made in re- ordering preemptable jobs to minimize the total number of jobs that will be preempted. The default value is 1. High values may adversely impact performance. Changes to the order of jobs on these at- tempts can be enabled with strict_order. The logic to support this option is only available in the se- lect/cons_tres plugin. send_user_signal Send the user signal (e.g. --signal=<sig_num>) at preemp- tion time even if the signal time hasn't been reached. In the case of a gracetime preemption the user signal will be sent if the user signal has been specified and not sent, otherwise a SIGTERM will be sent to the tasks. strict_order When reordering preemptable jobs, place the most recently tested job at the front of the list since we are certain that it actually added resources needed by the new job. This ensures that with enough reorder attempts, the mini- mum possible number of jobs will be preempted. See also reorder_count. The logic to support this option is only available in the select/cons_tres plugin. suspend_grace_time Specifies, in units of seconds, the preemption grace time when using PreemptMode=SUSPEND. When a job is suspended, the SIGTSTP signal will be sent, and then after waiting the specified suspend grace time, the SIGSTOP signal will be sent. The default value is 2 seconds. NOTE: This parameter is only used when PreemptMode=SUS- PEND is configured or when suspending jobs with scontrol suspend. For setting the preemption grace time when us- ing other preemption modes, see GraceTime. youngest_first If set, then the preemption sorting algorithm will be changed to sort by the job start times to favor preempt- ing younger jobs over older. (Requires preempt/parti- tion_prio or preempt/qos plugins.) PreemptType Specifies the plugin used to identify which jobs can be pre- empted in order to start a pending job. Unset by default. preempt/partition_prio Job preemption is based upon partition PriorityTier. Jobs in higher PriorityTier partitions may preempt jobs from lower PriorityTier partitions. This is not compati- ble with PreemptMode=OFF. preempt/qos Job preemption rules are specified by Quality Of Service (QOS) specifications in the Slurm database. In the case of PreemptMode=SUSPEND, a preempting job has to be sub- mitted to a partition with a higher PriorityTier or to the same partition. Submission to the same partition is also supported, which results in the preemptor QoS to gang schedule the preemptee QoS. This option is not com- patible with PreemptMode=OFF. A configuration of Pre- emptMode=SUSPEND is only supported by the SelectType=se- lect/cons_tres plugin. See the sacctmgr man page to con- figure the options for preempt/qos. PreemptExemptTime Global option for minimum run time for all jobs before they can be considered for preemption. Any QOS PreemptExemptTime takes precedence over the global option. This is only honored for Pre- emptMode=REQUEUE and PreemptMode=CANCEL. A time of -1 disables the option, equivalent to 0. Acceptable time formats include "minutes", "minutes:seconds", "hours:min- utes:seconds", "days-hours", "days-hours:minutes", and "days-hours:minutes:seconds". PrEpParameters Parameters to be passed to the PrEpPlugins. PrEpPlugins A resource for programmers wishing to write their own plugins for the Prolog and Epilog (PrEp) scripts. The default, and cur- rently the only implemented plugin is prep/script. Additional plugins can be specified in a comma-separated list. For more in- formation please see the PrEp Plugin API documentation page: <https://slurm.schedmd.com/prep_plugins.html> PriorityCalcPeriod The period of time in minutes in which the half-life decay will be re-calculated. Applicable only if PriorityType=priority/mul- tifactor. The default value is 5 (minutes). PriorityDecayHalfLife This controls how long prior resource use is considered in de- termining how over- or under-serviced an association is (user, account and cluster) in determining job priority. The record of usage will be decayed over time, with half of the original value cleared at age PriorityDecayHalfLife. If set to 0 no decay will be applied. This is helpful if you want to enforce hard time limits per association. If set to 0 PriorityUsageResetPeriod must be set to some interval. Applicable only if Priority- Type=priority/multifactor. The unit is a time string (i.e. min, hr:min:00, days-hr:min:00, or days-hr). The default value is 7-0 (7 days). PriorityFavorSmall Specifies that small jobs should be given preferential schedul- ing priority. Applicable only if PriorityType=priority/multi- factor. Supported values are "YES" and "NO". The default value is "NO". PriorityFlags Flags to modify priority behavior. Applicable only if Priority- Type=priority/multifactor. The keywords below have no associ- ated value (e.g. "PriorityFlags=ACCRUE_ALWAYS,SMALL_RELA- TIVE_TO_TIME"). ACCRUE_ALWAYS If set, priority age factor will be increased despite job ineligibility due to either depen- dencies, holds or begin time in the future. Ac- crue limits are ignored. CALCULATE_RUNNING If set, priorities will be recalculated not only for pending jobs, but also running and suspended jobs. DEPTH_OBLIVIOUS If set, priority will be calculated based simi- lar to the normal multifactor calculation, but depth of the associations in the tree does not adversely affect their priority. This option automatically enables NO_FAIR_TREE. NO_FAIR_TREE Disables the "fair tree" algorithm, and reverts to "classic" fair share priority scheduling. INCR_ONLY If set, priority values will only increase in value. Job priority will never decrease in value. MAX_TRES If set, the weighted TRES value (e.g. TRES- BillingWeights) is calculated as the MAX of in- dividual TRESs on a node (e.g. cpus, mem, gres) plus the sum of all global TRESs (e.g. li- censes). MAX_TRES_GRES If set, the weighted TRES value (e.g. TRES- BillingWeights) is calculated as the MAX of in- dividual TRESs on a node (e.g. cpus, mem), plus the billable gres, plus the sum of all global TRESs (e.g. licenses). NO_NORMAL_ALL If set, all NO_NORMAL_* flags are set. NO_NORMAL_ASSOC If set, the association factor is not normal- ized against the highest association priority. NO_NORMAL_PART If set, the partition factor is not normalized against the highest partition PriorityJobFac- tor. NO_NORMAL_QOS If set, the QOS factor is not normalized against the highest qos priority. NO_NORMAL_TRES If set, the TRES factor is not normalized against the job's partition TRES counts. SMALL_RELATIVE_TO_TIME If set, the job's size component will be based upon not the job size alone, but the job's size divided by its time limit. PriorityMaxAge Specifies the job age which will be given the maximum age factor in computing priority. For example, a value of 30 minutes would result in all jobs over 30 minutes old would get the same age-based priority. Applicable only if PriorityType=prior- ity/multifactor. The unit is a time string (i.e. min, hr:min:00, days-hr:min:00, or days-hr). The default value is 7-0 (7 days). PriorityParameters Arbitrary string used by the PriorityType plugin. PrioritySiteFactorParameters Arbitrary string used by the PrioritySiteFactorPlugin plugin. PrioritySiteFactorPlugin The specifies an optional plugin to be used alongside "prior- ity/multifactor", which is meant to initially set and continu- ously update the SiteFactor priority factor. Unset by default. PriorityType This specifies the plugin to be used in establishing a job's scheduling priority. Also see PriorityFlags for configuration options. The default value is "priority/multifactor". priority/basic Jobs are evaluated in a First In, First Out (FIFO) man- ner. priority/multifactor Jobs are assigned a priority based upon a variety of fac- tors that include size, age, Fairshare, etc. When not FIFO scheduling, jobs are prioritized in the following order: 1. Jobs that can preempt 2. Jobs with an advanced reservation 3. Partition PriorityTier 4. Job priority 5. Job submit time 6. Job ID PriorityUsageResetPeriod At this interval the usage of associations will be reset to 0. This is used if you want to enforce hard limits of time usage per association. If PriorityDecayHalfLife is set to be 0 no de- cay will happen and this is the only way to reset the usage ac- cumulated by running jobs. By default this is turned off and it is advised to use the PriorityDecayHalfLife option to avoid not having anything running on your cluster, but if your schema is set up to only allow certain amounts of time on your system this is the way to do it. Applicable only if PriorityType=prior- ity/multifactor. NONE Never clear historic usage. The default value. NOW Clear the historic usage now. Executed at startup and reconfiguration time. DAILY Cleared every day at midnight. WEEKLY Cleared every week on Sunday at time 00:00. MONTHLY Cleared on the first day of each month at time 00:00. QUARTERLY Cleared on the first day of each quarter at time 00:00. YEARLY Cleared on the first day of each year at time 00:00. PriorityWeightAge An integer value that sets the degree to which the queue wait time component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. Requires Account- ingStorageType=accounting_storage/slurmdbd. The default value is 0. PriorityWeightAssoc An integer value that sets the degree to which the association component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. The default value is 0. PriorityWeightFairshare An integer value that sets the degree to which the fair-share component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. Requires AccountingStor- ageType=accounting_storage/slurmdbd. The default value is 0. PriorityWeightJobSize An integer value that sets the degree to which the job size com- ponent contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. The default value is 0. PriorityWeightPartition Partition factor used by priority/multifactor plugin in calcu- lating job priority. Applicable only if PriorityType=prior- ity/multifactor. The default value is 0. PriorityWeightQOS An integer value that sets the degree to which the Quality Of Service component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. The default value is 0. PriorityWeightTRES A comma-separated list of TRES Types and weights that sets the degree that each TRES Type contributes to the job's priority. e.g. PriorityWeightTRES=CPU=1000,Mem=2000,GRES/gpu=3000 Applicable only if PriorityType=priority/multifactor and if Ac- countingStorageTRES is configured with each TRES Type. Negative values are allowed. The default values are 0. PrivateData This controls what type of information is hidden from regular users. By default, all information is visible to all users. User SlurmUser and root can always view all information. Multi- ple values may be specified with a comma separator. Acceptable values include: accounts (NON-SlurmDBD ACCOUNTING ONLY) Prevents users from view- ing any account definitions unless they are coordinators of them. events prevents users from viewing event information unless they have operator status or above. jobs Prevents users from viewing jobs or job steps belonging to other users. (NON-SlurmDBD ACCOUNTING ONLY) Prevents users from viewing job records belonging to other users unless they are coordinators of the association running the job when using sacct. nodes Prevents users from viewing node state information. partitions Prevents users from viewing partition state information. reservations Prevents regular users from viewing reservations which they can not use. usage Prevents users from viewing usage of any other user, this applies to sshare. (NON-SlurmDBD ACCOUNTING ONLY) Pre- vents users from viewing usage of any other user, this applies to sreport. users (NON-SlurmDBD ACCOUNTING ONLY) Prevents users from view- ing information of any user other than themselves, this also makes it so users can only see associations they deal with. Coordinators can see associations of all users in the account they are coordinator of, but can only see themselves when listing users. ProctrackType Identifies the plugin to be used for process tracking on a job step basis. The slurmd daemon uses this mechanism to identify all processes which are children of processes it spawns for a user job step. NOTE: "proctrack/linuxproc" and "proctrack/pgid" can fail to identify all processes associated with a job since processes can become a child of the init process (when the par- ent process terminates) or change their process group. To reli- ably track all processes, "proctrack/cgroup" is highly recom- mended. NOTE: The NamespaceType applies to a job namespace iso- lation, while ProctrackType applies to job resource limits and tracking. Acceptable values at present include: proctrack/cgroup Uses linux cgroups to constrain and track processes, and is the default for systems with cgroup support. NOTE: See "man cgroup.conf" for configuration details. proctrack/linuxproc Uses linux process tree using parent process IDs. proctrack/pgid Uses Process Group IDs. NOTE: This is the default for the BSD family. Prolog Pathname of a program for the slurmd to execute whenever it is asked to run a job step from a new job allocation. If it is not an absolute path name (i.e. it does not start with a slash), it will be searched for in the same directory as the slurm.conf file. A glob pattern (See glob (7)) may also be used to specify more than one program to run (e.g. "/etc/slurm/prolog.d/*"). When more than one prolog script is configured, they are exe- cuted in reverse alphabetical order (z-a -> Z-A -> 9-0). The slurmd executes the prolog before starting the first job step. The prolog script or scripts may be used to purge files, enable user login, etc. By default there is no prolog. Any configured script is expected to complete execution quickly (in less time than MessageTimeout). If the prolog fails (returns a non-zero exit code), this will result in the node being set to a DRAIN state and the job being requeued. The job will be placed in a held state, unless nohold_on_prolog_fail is configured in Sched- ulerParameters. See Prolog and Epilog Scripts for more informa- tion. NOTE: It is possible to configure multiple prolog scripts by in- cluding this option on multiple lines. PrologEpilogTimeout The interval in seconds Slurm waits for Prolog and Epilog before terminating them. The default behavior is to wait indefinitely. This interval applies to the Prolog and Epilog run by slurmd daemon before and after the job, the PrologSlurmctld and Epi- logSlurmctld run by slurmctld daemon, and the SPANK plugin pro- log/epilog calls: slurm_spank_job_prolog and slurm_spank_job_epilog. If the PrologSlurmctld times out, the job is requeued if possi- ble. If the Prolog or slurm_spank_job_prolog time out, the job is requeued if possible and the node is drained. If the Epilog or slurm_spank_job_epilog time out, the node is drained. In all cases, errors are logged. NOTE: This value is not used for prologs if PrologTimeout is configured. Likewise, this value is not used for epilogs if EpilogTimout is configured. PrologTimeout The interval in seconds Slurm waits for Prolog before terminat- ing them. The default value is PrologEpilogTimeout. This inter- val applies to the Prolog run by slurmd daemon before the job, the PrologSlurmctld run by slurmctld daemon, and the SPANK plu- gin prolog call: slurm_spank_job_prolog. If the PrologSlurmctld times out, the job is requeued if possi- ble. If the Prolog or slurm_spank_job_prolog time out, the job is requeued if possible and the node is drained. In all cases, errors are logged. PrologFlags Flags to control the Prolog behavior. By default no flags are set. Multiple flags may be specified in a comma-separated list. Currently supported options are: Alloc If set, the Prolog script will be executed at job allo- cation. By default, Prolog is executed just before the task is launched. Therefore, when salloc is started, no Prolog is executed. Alloc is useful for preparing things before a user starts to use any allocated resources. In particular, this flag is needed on a Cray system when cluster compatibility mode is enabled. NOTE: Use of the Alloc flag will increase the time re- quired to start jobs. Contain At job allocation time, use the ProcTrack plugin to cre- ate a job container on all allocated compute nodes. This container may be used for user processes not launched under Slurm control, for example pam_slurm_adopt may place processes launched through a direct user login into this container. If using pam_slurm_adopt, then ProcTrackType must be set to proc- track/cgroup. Setting the Contain implicitly sets the Alloc flag. DeferBatch If set, slurmctld will wait until the prolog completes on all allocated nodes before sending the batch job launch request. With just the Alloc flag, slurmctld will launch the batch step as soon as the first node in the job allocation completes the prolog. NoHold If set, the Alloc flag should also be set. This will al- low for salloc to not block until the prolog is finished on each node. The blocking will happen when steps reach the slurmd and before any execution has happened in the step. This is a much faster way to work and if using srun to launch your tasks you should use this flag. This flag cannot be combined with the Contain or X11 flags. ForceRequeueOnFail When a batch job fails to launch due to a Prolog fail- ure, always requeue it automatically even if the job re- quested no requeues. NOTE: Setting this flag implicitly sets the Alloc flag. RunInJob Make the Prolog/Epilog run in the extern slurmstepd. This will contain it in one of on the job's processes. This will contain it in the cgroup if configured. Set- ting the RunInJob flag implicitly sets the Contain and Alloc flag. Serial By default, the Prolog and Epilog scripts run concur- rently on each node. This flag forces those scripts to run serially within each node, but with a significant penalty to job throughput on each node. NOTE: This is incompatible with RunInJob. X11 Enable Slurm's built-in X11 forwarding capabilities. This is incompatible with ProctrackType=proctrack/linux- proc. Setting the X11 flag implicitly enables both Con- tain and Alloc flags as well. PrologSlurmctld Fully qualified pathname of a program for the slurmctld daemon to execute before granting a new job allocation (e.g. "/usr/lo- cal/slurm/prolog_controller"). The program executes as Slur- mUser on the same node where the slurmctld daemon executes, giv- ing it permission to drain nodes and requeue the job if a fail- ure occurs or cancel the job if appropriate. Exactly what the program does and how it accomplishes this is completely at the discretion of the system administrator. Information about the job being initiated, its allocated nodes, etc. are passed to the program using environment variables. While this program is run- ning, the nodes associated with the job will be have a POWER_UP/CONFIGURING flag set in their state, which can be read- ily viewed. The slurmctld daemon will wait indefinitely for this program to complete. Once the program completes with an exit code of zero, the nodes will be considered ready for use and the program will be started. If some node can not be made available for use, the program should drain the node (typically using the scontrol command) and terminate with a non-zero exit code. A non-zero exit code will result in the job being re- queued (where possible) or killed. Note that only batch jobs can be requeued. See Prolog and Epilog Scripts for more informa- tion. NOTE: It is possible to configure multiple prolog scripts by in- cluding this option on multiple lines. PropagatePrioProcess Controls the scheduling priority (nice value) of user spawned tasks. 0 The tasks will inherit the scheduling priority from the slurm daemon. This is the default value. 1 The tasks will inherit the scheduling priority of the com- mand used to submit them (e.g. srun or sbatch). Unless the job is submitted by user root, the tasks will have a sched- uling priority no higher than the slurm daemon spawning them. 2 The tasks will inherit the scheduling priority of the com- mand used to submit them (e.g. srun or sbatch) with the re- striction that their nice value will always be one higher than the slurm daemon (i.e. the tasks scheduling priority will be lower than the slurm daemon). PropagateResourceLimits A comma-separated list of resource limit names. The slurmd dae- mon uses these names to obtain the associated (soft) limit val- ues from the user's process environment on the submit node. These limits are then propagated and applied to the jobs that will run on the compute nodes. This parameter can be useful when system limits vary among nodes. Any resource limits that do not appear in the list are not propagated. However, the user can override this by specifying which resource limits to propa- gate with the sbatch or srun "--propagate" option. If neither PropagateResourceLimits or PropagateResourceLimitsExcept are configured and the "--propagate" option is not specified, then the default action is to propagate all limits. Only one of the parameters, either PropagateResourceLimits or PropagateResource- LimitsExcept, may be specified. The user limits can not exceed hard limits under which the slurmd daemon operates. If the user limits are not propagated, the limits from the slurmd daemon will be propagated to the user's job. The limits used for the Slurm daemons can be set in the /etc/sysconf/slurm file. For more information, see: https://slurm.schedmd.com/faq.html#mem- lock The following limit names are supported by Slurm (although some options may not be supported on some systems): ALL All limits listed below (default) NONE No limits listed below AS The maximum address space (virtual memory) for a process. CORE The maximum size of core file CPU The maximum amount of CPU time DATA The maximum size of a process's data segment FSIZE The maximum size of files created. Note that if the user sets FSIZE to less than the current size of the slurmd.log, job launches will fail with a 'File size limit exceeded' error. MEMLOCK The maximum size that may be locked into memory NOFILE The maximum number of open files NPROC The maximum number of processes available RSS The maximum resident set size. Note that this only has effect with Linux kernels 2.4.30 or older or BSD. STACK The maximum stack size PropagateResourceLimitsExcept A comma-separated list of resource limit names. By default, all resource limits will be propagated, (as described by the Propa- gateResourceLimits parameter), except for the limits appearing in this list. The user can override this by specifying which re- source limits to propagate with the sbatch or srun "--propagate" option. See PropagateResourceLimits above for a list of valid limit names. RebootProgram Program to be executed on each compute node to reboot it. In- voked on each node once it becomes idle after the command "scon- trol reboot" is executed by an authorized user or a job is sub- mitted with the "--reboot" option. After rebooting, the node is returned to normal use. See ResumeTimeout to configure the time you expect a reboot to finish in. A node will be marked DOWN if it doesn't reboot within ResumeTimeout. ReconfigFlags Flags to control various actions that may be taken when an "scontrol reconfig" command is issued. Currently the options are: KeepPartInfo If set, an "scontrol reconfig" command will maintain the in-memory value of partition "state" and other parameters that may have been dynamically updated by "scontrol update". Par- tition information in the slurm.conf file will be merged with in-memory data. This flag super- sedes the KeepPartState flag. KeepPartState If set, an "scontrol reconfig" command will preserve only the current "state" value of in-memory partitions and will reset all other parameters of the partitions that may have been dynamically updated by "scontrol update" to the values from the slurm.conf file. Partition in- formation in the slurm.conf file will be merged with in-memory data. KeepPowerSaveSettings If set, an "scontrol reconfig" command will preserve the current state of SuspendExcNodes, SuspendExcParts and SuspendExcStates. The default for the above flags is not set, and the "scontrol reconfig" will rebuild the partition information using only the definitions in the slurm.conf file. RequeueExit Enables automatic requeue for batch jobs which exit with the specified values. Separate multiple exit code by a comma and/or specify numeric ranges using a "-" separator (e.g. "Requeue- Exit=1-9,18") Jobs will be put back in to pending state and later scheduled again. Restarted jobs will have the environment variable SLURM_RESTART_COUNT set to the number of times the job has been restarted. RequeueExitHold Enables automatic requeue for batch jobs which exit with the specified values, with these jobs being held until released man- ually by the user. Separate multiple exit code by a comma and/or specify numeric ranges using a "-" separator (e.g. "Re- queueExitHold=10-12,16") These jobs are put in the JOB_SPE- CIAL_EXIT exit state. Restarted jobs will have the environment variable SLURM_RESTART_COUNT set to the number of times the job has been restarted. ResumeFailProgram The program that will be executed when nodes fail to resume to by ResumeTimeout. The argument to the program will be the names of the failed nodes (using Slurm's hostlist expression format). Programs will be killed if they run longer than the largest con- figured, global or partition, ResumeTimeout or SuspendTimeout. ResumeProgram Slurm supports a mechanism to reduce power consumption on nodes that remain idle for an extended period of time. This is typi- cally accomplished by reducing voltage and frequency or powering the node down. ResumeProgram is the program that will be exe- cuted when a node in power save mode is assigned work to per- form. For reasons of reliability, ResumeProgram may execute more than once for a node when the slurmctld daemon crashes and is restarted. If ResumeProgram is unable to restore a node to service with a responding slurmd and an updated BootTime, it should set the node state to DOWN, which will result in a re- queue of any job associated with the node - this will happen au- tomatically if the node doesn't register within ResumeTimeout. SchedulerParameters=requeue_on_resume_failure can be used to al- ways requeue batch jobs in this situation, even if the job re- quested no requeues. If the node isn't actually rebooted (i.e. when multiple-slurmd is configured) starting slurmd with "-b" option might be useful. The program executes as SlurmUser. The argument to the program will be the names of nodes to be removed from power savings mode (using Slurm's hostlist expression for- mat). A job to node mapping is available in JSON format by read- ing the temporary file specified by the SLURM_RESUME_FILE envi- ronment variable. This file is closed once slurmctld shuts down. If ResumeProgram is running, slurmctld shutdown is delayed by up to ten seconds to give ResumeProgram time to read this file. Therefore, this file should be read at the beginning of ResumeProgram. By default no program is run. Programs will be killed if they run longer than the largest configured, global or partition, ResumeTimeout or SuspendTimeout. ResumeRate The rate at which nodes in power save mode are returned to nor- mal operation by ResumeProgram. The value is a number of nodes per minute and it can be used to prevent power surges if a large number of nodes in power save mode are assigned work at the same time (e.g. a large job starts). A value of zero results in no limits being imposed. The default value is 300 nodes per minute. ResumeTimeout Maximum time permitted (in seconds) between when a node resume request is issued and when the node is actually available for use. Nodes which fail to respond in this time frame will be marked DOWN and the jobs scheduled on the node requeued if pos- sible. Nodes which reboot after this time frame will be marked DOWN with a reason of "Node unexpectedly rebooted." The default value is 60 seconds, and the maximum value is either 65533 or INFINITE. ResvEpilog Fully qualified pathname of a program for the slurmctld to exe- cute when a reservation ends. It does not run when a running reservation is deleted. The program can be used to cancel jobs, modify partition configuration, etc. The reservation named will be passed as an argument to the program. By default there is no epilog. ResvOverRun Describes how long a job already running in a reservation should be permitted to execute after the end time of the reservation has been reached. The time period is specified in minutes and the default value is 0 (kill the job immediately). The value may not exceed 65533 minutes, although a value of "UNLIMITED" is supported to permit a job to run indefinitely after its reserva- tion is terminated. ResvProlog Fully qualified pathname of a program for the slurmctld to exe- cute when a reservation begins. The program can be used to can- cel jobs, modify partition configuration, etc. The reservation named will be passed as an argument to the program. By default there is no prolog. ReturnToService Controls when a DOWN node will be returned to service. The de- fault value is 0. Supported values include 0 A node will remain in the DOWN state until a system adminis- trator explicitly changes its state (even if the slurmd dae- mon registers and resumes communications). 1 A DOWN node will become available for use upon registration with a valid configuration only if it was set DOWN due to being non-responsive. If the node was set DOWN for any other reason (low memory, unexpected reboot, etc.), its state will not automatically be changed. A node registers with a valid configuration if its memory, GRES, CPU count, etc. are equal to or greater than the values configured in slurm.conf. 2 A DOWN node will become available for use upon registration with a valid configuration. The node could have been set DOWN for any reason. A node registers with a valid configu- ration if its memory, GRES, CPU count, etc. are equal to or greater than the values configured in slurm.conf. SchedulerParameters The interpretation of this parameter varies by SchedulerType. Multiple options may be comma separated. allow_zero_lic If set, then job submissions requesting more than config- ured licenses won't be rejected. assoc_limit_stop If set and a job cannot start due to association limits, then do not attempt to initiate any lower priority jobs in that partition. Setting this can decrease system throughput and utilization, but avoid potentially starv- ing larger jobs by preventing them from launching indefi- nitely. batch_sched_delay=How long, in seconds, the scheduling of batch jobs can be delayed. This can be useful in a high-throughput environment in which batch jobs are submitted at a very high rate (i.e. using the sbatch command) and one wishes to reduce the overhead of attempting to schedule each job at submit time. The default value is 3 seconds. bb_array_stage_cnt=Number of tasks from a job array that should be available for burst buffer resource allocation. Higher values will increase the sys- tem overhead as each task from the job array will be moved to its own job record in memory, so relatively small values are generally recommended. The default value is 10. bf_allow_magnetic_slot By default the backfill scheduler will not add a slot in the bf plan when a job attempts to use a magnetic reser- vation. This option reverses this to make the backfill scheduler add slots in the bf plan when jobs are eligible to run in a magnetic reservation. With this option en- abled, jobs inside magnetic reservations will respect priorities and also be counted against the backfill lim- its such as bf_max_job_test. NOTE: Backfill first evalu- ates jobs inside reservations, which means all magnetic jobs will be tested first. When enabling this option, make sure to revise (increasing if necessary) the back- fill limits configured to validate backfill cycle gets to test the expected jobs in the queue. NOTE: If bf_one_resv_per_job is used along with this option the magnetic reservation slot will now be the only slot in the bf plan. Otherwise the slot will be the first one outside the magnetic reservation. bf_busy_nodes When selecting resources for pending jobs to reserve for future execution (i.e. the job can not be started immedi- ately), then preferentially select nodes that are in use. This will tend to leave currently idle resources avail- able for backfilling longer running jobs, but may result in allocations having less than optimal network topology. This option is currently only supported by the se- lect/cons_tres plugin. bf_continue The backfill scheduler periodically releases locks in or- der to permit other operations to proceed rather than blocking all activity for what could be an extended pe- riod of time. Setting this option will cause the back- fill scheduler to continue processing pending jobs from its original job list after releasing locks even if job or node state changes. bf_hetjob_immediate Instruct the backfill scheduler to attempt to start a heterogeneous job as soon as all of its components are determined able to do so. Otherwise, the backfill sched- uler will delay heterogeneous jobs initiation attempts until after the rest of the queue has been processed. This delay may result in lower priority jobs being allo- cated resources, which could delay the initiation of the heterogeneous job due to account and/or QOS limits being reached. This option is disabled by default. If enabled and bf_hetjob_prio=min is not set, then it would be auto- matically set. bf_hetjob_prio=[min|avg|max] At the beginning of each backfill scheduling cycle, a list of pending to be scheduled jobs is sorted according to the precedence order configured in PriorityType. This option instructs the scheduler to alter the sorting algo- rithm to ensure that all components belonging to the same heterogeneous job will be attempted to be scheduled con- secutively (thus not fragmented in the resulting list). More specifically, all components from the same heteroge- neous job will be treated as if they all have the same priority (minimum, average or maximum depending upon this option's parameter) when compared with other jobs (or other heterogeneous job components). The original order will be preserved within the same heterogeneous job. Note that the operation is calculated for the PriorityTier layer and for the Priority resulting from the prior- ity/multifactor plugin calculations. When enabled, if any heterogeneous job requested an advanced reservation, then all of that job's components will be treated as if they had requested an advanced reservation (and get preferen- tial treatment in scheduling). Note that this operation does not update the Priority values of the heterogeneous job components, only their order within the list, so the output of the sprio command will not be affected. Heterogeneous jobs have special scheduling properties: they are only scheduled by the backfill scheduling plu- gin, each of their components is considered separately when reserving resources (and might have different Prior- ityTier or different Priority values), and no heteroge- neous job component is actually allocated resources until all if its components can be initiated. This may imply potential scheduling deadlock scenarios because compo- nents from different heterogeneous jobs can start reserv- ing resources in an interleaved fashion (not consecu- tively), but none of the jobs can reserve resources for all components and start. Enabling this option can help to mitigate this problem. By default, this option is dis- abled. bf_interval=The number of seconds between backfill iterations. Higher values result in less overhead and better respon- siveness. This option applies only to Scheduler- Type=sched/backfill. Default: 30, Min: 1, Max: 10800 (3h). A setting of -1 will disable the backfill schedul- ing loop. bf_job_part_count_reserve=The backfill scheduling logic will re- serve resources for the specified count of highest priority jobs in each partition. For example, bf_job_part_count_reserve=10 will cause the backfill scheduler to reserve resources for the ten highest prior- ity jobs in each partition. Any lower priority job that can be started using currently available resources and not adversely impact the expected start time of these higher priority jobs will be started by the backfill scheduler The default value is zero, which will reserve resources for any pending job and delay initiation of lower priority jobs. Also see bf_min_age_reserve and bf_min_prio_reserve. Default: 0, Min: 0, Max: 100000. bf_licenses Require the backfill scheduling logic to track and plan for license availability. By default, any job blocked on license availability will not have resources reserved which can lead to job starvation. This option implicitly enables bf_running_job_reserve. bf_max_job_array_resv=The maximum number of tasks from a job ar- ray for which the backfill scheduler will reserve resources in the future. Since job arrays can potentially have millions of tasks, the overhead in reserving resources for all tasks can be prohibitive. In addition various limits may prevent all the jobs from starting at the expected times. This has no impact upon the number of tasks from a job array that can be started immediately, only those tasks expected to start at some future time. Default: 20, Min: 0, Max: 1000. NOTE: Jobs submitted to multiple partitions appear in the job queue once per partition. If different copies of a single job array record aren't consecutive in the job queue and an- other job array record is in between, then bf_max_job_ar- ray_resv tasks are considered per partition that the job is submitted to. bf_max_job_assoc=The maximum number of jobs per user association to attempt starting with the backfill scheduler. This setting is similar to bf_max_job_user but is handy if a user has multiple asso- ciations equating to basically different users. One can set this limit to prevent users from flooding the back- fill queue with jobs that cannot start and that prevent jobs from other users to start. This option applies only to SchedulerType=sched/backfill. Also see the bf_max_job_user, bf_max_job_part, bf_max_job_test, and bf_max_job_user_part options. Set bf_max_job_test to a value much higher than bf_max_job_assoc. Default: 0 (no limit), Min: 0, Max: bf_max_job_test. bf_max_job_part=The maximum number of jobs per partition to at- tempt starting with the backfill scheduler. This can be especially helpful for systems with large numbers of partitions and jobs. This option applies only to SchedulerType=sched/backfill. Also see the partition_job_depth and bf_max_job_test options. Set bf_max_job_test to a value much higher than bf_max_job_part. Default: 0 (no limit), Min: 0, Max: bf_max_job_test. bf_max_job_start=The maximum number of jobs which can be initi- ated in a single iteration of the backfill scheduler. This option applies only to SchedulerType=sched/backfill. Default: 0 (no limit), Min: 0, Max: 10000. bf_max_job_test=The maximum number of jobs to attempt backfill scheduling for (i.e. the queue depth). Higher values result in more overhead and less responsiveness. Until an attempt is made to backfill schedule a job, its expected initiation time value will not be set. In the case of large clus- ters, configuring a relatively small value may be desir- able. This option applies only to Scheduler- Type=sched/backfill. Default: 500, Min: 1, Max: 1,000,000. bf_max_job_user=The maximum number of jobs per user to attempt starting with the backfill scheduler for ALL partitions. One can set this limit to prevent users from flooding the backfill queue with jobs that cannot start and that prevent jobs from other users to start. This is similar to the MAXIJOB limit in Maui. This option applies only to SchedulerType=sched/backfill. Also see the bf_max_job_part, bf_max_job_test, and bf_max_job_user_part options. Set bf_max_job_test to a value much higher than bf_max_job_user. Default: 0 (no limit), Min: 0, Max: bf_max_job_test. bf_max_job_user_part=The maximum number of jobs per user per partition to attempt starting with the backfill scheduler for any single partition. This option applies only to SchedulerType=sched/backfill. Also see the bf_max_job_part, bf_max_job_test, and bf_max_job_user options. Default: 0 (no limit), Min: 0, Max: bf_max_job_test. bf_max_time=The maximum time in seconds the backfill scheduler can spend (including time spent sleeping when locks are released) before discontin- uing, even if maximum job counts have not been reached. This option applies only to SchedulerType=sched/backfill. The default value is the value of bf_interval (which de- faults to 30 seconds). Default: bf_interval value (def. 30 sec), Min: 1, Max: 3600 (1h). NOTE: If bf_interval is short and bf_max_time is large, this may cause locks to be acquired too frequently and starve out other serviced RPCs. It's advisable if using this parameter to set max_rpc_cnt high enough that scheduling isn't always dis- abled, and low enough that the interactive workload can get through in a reasonable period of time. max_rpc_cnt needs to be below 256 (the default RPC thread limit). Running around the middle (150) may give you good re- sults. NOTE: When increasing the amount of time spent in the backfill scheduling cycle, Slurm can be prevented from responding to client requests in a timely manner. To address this you can use max_rpc_cnt to specify a number of queued RPCs before the scheduler stops to respond to these requests. bf_min_age_reserve=The backfill and main scheduling logic will not reserve resources for pending jobs until they have been pending and runnable for at least the specified number of seconds. In addition, jobs waiting for less than the specified number of seconds will not prevent a newly submitted job from starting im- mediately, even if the newly submitted job has a lower priority. This can be valuable if jobs lack time limits or all time limits have the same value. The default value is zero, which will reserve resources for any pend- ing job and delay initiation of lower priority jobs. Also see bf_job_part_count_reserve and bf_min_prio_re- serve. Default: 0, Min: 0, Max: 2592000 (30 days). bf_min_prio_reserve=The backfill and main scheduling logic will not reserve resources for pending jobs unless they have a priority equal to or higher than the specified value. In addition, jobs with a lower pri- ority will not prevent a newly submitted job from start- ing immediately, even if the newly submitted job has a lower priority. This can be valuable if one wished to maximize system utilization without regard for job prior- ity below a certain threshold. The default value is zero, which will reserve resources for any pending job and delay initiation of lower priority jobs. Also see bf_job_part_count_reserve and bf_min_age_reserve. De- fault: 0, Min: 0, Max: 2^63. bf_node_space_size=Size of backfill node_space table. Adding a single job to backfill reservations in the worst case can consume two node_space records. In the case of large clusters, configuring a relatively small value may be desirable. This option applies only to SchedulerType=sched/backfill. Also see bf_max_job_test and bf_running_job_reserve. Default: bf_max_job_test, Min: 2, Max: 2,000,000. bf_one_resv_per_job Disallow adding more than one backfill reservation per job. The scheduling logic builds a sorted list of job- partition pairs. Jobs submitted to multiple partitions have as many entries in the list as requested partitions. By default, the backfill scheduler may evaluate all the job-partition entries for a single job, potentially re- serving resources for each pair, but only starting the job in the reservation offering the earliest start time. Having a single job reserving resources for multiple par- titions could impede other jobs (or hetjob components) from reserving resources already reserved for the parti- tions that don't offer the earliest start time. A single job that requests multiple partitions can also prevent itself from starting earlier in a lower priority parti- tion if the partitions overlap nodes and a backfill reservation in the higher priority partition blocks nodes that are also in the lower priority partition. This op- tion makes it so that a job submitted to multiple parti- tions will stop reserving resources once the first job- partition pair has booked a backfill reservation. Subse- quent pairs from the same job will only be tested to start now. This allows for other jobs to be able to book the other pairs resources at the cost of not guaranteeing that the multi partition job will start in the partition offering the earliest start time (unless it can start im- mediately). This option is disabled by default. bf_resolution=The number of seconds in the resolution of data maintained about when jobs begin and end. Higher values result in better responsive- ness and quicker backfill cycles by using larger blocks of time to determine node eligibility. However, higher values lead to less efficient system planning, and may miss opportunities to improve system utilization. This option applies only to SchedulerType=sched/backfill. De- fault: 60, Min: 1, Max: 3600 (1 hour). bf_running_job_reserve Add an extra step to backfill logic, which creates back- fill reservations for jobs running on whole nodes. This option is disabled by default. bf_topopt_enable Enable experimental hook to control whether to delay jobs in backfill for a better placement. Modify src/plug- ins/sched/backfill/oracle.c for testing. It is recommended to disable the main scheduler so that all jobs are planned through backfill and utilize the or- acle function(). This can be done by setting SchedulerPa- rameters=sched_interval=-1. It's also recommended to run with SchedulerParame- ters=bf_running_job_reserve for better planning. bf_topopt_iterations The number of successive backfill map slots that a job may be delayed. This option applies only when the bf_topopt_enable is set. bf_window=The number of minutes into the future to look when considering jobs to schedule. Higher values result in more overhead and less respon- siveness. A value at least as long as the highest al- lowed time limit is generally advisable to prevent job starvation. In order to limit the amount of data managed by the backfill scheduler, if the value of bf_window is increased, then it is generally advisable to also in- crease bf_resolution. This option applies only to Sched- ulerType=sched/backfill. Default: 1440 (1 day), Min: 1, Max: 43200 (30 days). bf_window_linear=For performance reasons, the backfill scheduler will decrease precision in calculation of job expected termination times. By de- fault, the precision starts at 30 seconds and that time interval doubles with each evaluation of currently exe- cuting jobs when trying to determine when a pending job can start. This algorithm can support an environment with many thousands of running jobs, but can result in the ex- pected start time of pending jobs being gradually being deferred due to lack of precision. A value for bf_win- dow_linear will cause the time interval to be increased by a constant amount on each iteration. The value is specified in units of seconds. For example, a value of 60 will cause the backfill scheduler on the first iteration to identify the job ending soonest and determine if the pending job can be started after that job plus all other jobs expected to end within 30 seconds (default initial value) of the first job. On the next iteration, the pend- ing job will be evaluated for starting after the next job expected to end plus all jobs ending within 90 seconds of that time (30 second default, plus the 60 second option value). The third iteration will have a 150 second win- dow and the fourth 210 seconds. Without this option, the time windows will double on each iteration and thus be 30, 60, 120, 240 seconds, etc. The use of bf_window_lin- ear is not recommended with more than a few hundred si- multaneously executing jobs. bf_yield_interval=The backfill scheduler will periodically re- linquish locks in order for other pending operations to take place. This specifies the times when the locks are relinquished in microseconds. Smaller values may be helpful for high throughput comput- ing when used in conjunction with the bf_continue option. Also see the bf_yield_sleep option. Default: 2,000,000 (2 sec), Min: 1, Max: 10,000,000 (10 sec). bf_yield_rpc_cnt If the number of active threads in the slurmctld daemon is lower than this value, continue scheduling of jobs. The scheduler will check this condition at certain points in code and release previously yielded locks if neces- sary. This is used to instruct Slurm when to stop pro- cessing requests and start scheduling new jobs, which is the opposite of max_rpc_cnt. In conjunction with max_rpc_cnt, it can improve Slurm's responsiveness to spikes of requests. Default: MAX((max_rpc_cnt / 10), 20) (option disabled), Min: 0, Max: 200. NOTE: If a value is set, then a value lower than max_rpc_cnt is recommended. It may require some tuning for each system, but needs to be high enough that sched- uling isn't always disabled, and low enough that requests can get through in a reasonable period of time. Avoid both values being close enough to cause continuous switching between request processing and scheduling. bf_yield_sleep=The backfill scheduler will periodically relin- quish locks in order for other pending operations to take place. This specifies the length of time for which the locks are relinquished in microseconds. Also see the bf_yield_interval option. Default: 500,000 (0.5 sec), Min: 1, Max: 10,000,000 (10 sec). build_queue_timeout=Defines the maximum time that can be devoted to building a queue of jobs to be tested for scheduling. If the system has a huge num- ber of jobs with dependencies, just building the job queue can take so much time as to adversely impact over- all system performance and this parameter can be adjusted as needed. The default value is 2,000,000 microseconds (2 seconds). correspond_after_task_cnt=Defines the number of array tasks that get split for potential aftercorr dependency check. Low number may result in dependent task check failures when the job one depends on gets purged before the split. Default: 10. default_queue_depth=The default number of jobs to attempt sched- uling (i.e. the queue depth) when a running job completes or other routine actions occur, however the frequency with which the scheduler is run may be limited by using the defer or sched_min_interval para- meters described below. The main scheduling loop will run (ignoring this limit) on a less frequent basis as de- fined by the sched_interval option described below. The default value is 100. See the partition_job_depth option to limit depth by partition. defer Setting this option will avoid attempting to schedule each job individually at job submit time, but defer it until a later time when scheduling multiple jobs simulta- neously may be possible. This option may improve system responsiveness when large numbers of jobs (many hundreds) are submitted at the same time, but it will delay the initiation time of individual jobs. Also see de- fault_queue_depth above. defer_batch Like defer, but only will defer scheduling for batch jobs. Interactive allocations from salloc/srun will still attempt to schedule immediately upon submission. delay_boot=Do not reboot nodes in order to satisfied this job's feature specification if the job has been eligible to run for less than this time period. If the job has waited for less than the speci- fied period, it will use only nodes which already have the specified features. The argument is in units of min- utes. Individual jobs may override this default value with the --delay-boot option. disable_job_shrink Deny user requests to shrink the size of running jobs. (However, running jobs may still shrink due to node fail- ure if the --no-kill option was set.) disable_hetjob_steps Disable job steps that span heterogeneous job alloca- tions. enable_hetjob_steps Enable job steps that span heterogeneous job allocations. The default value. enable_job_state_cache Enables an independent cache of job state details within slurmctld. This allows processing of `squeue --only-job-state` and replaced RPCs with minimal impact on other slurmctld operations. enable_user_top Enable use of the "scontrol top" command by non-privi- leged users. extra_constraints Enable node filtering with the --extra option for salloc, sbatch, and srun and the node's Extra field. ignore_constraint_validation If set, and a job requests --constraint any features in the request that would create an invalid request with the current system will not generate an error. This is help- ful for dynamic systems where nodes with features come and go. Jobs will remain in the job queue until the re- quested feature is in the cluster and available. Please note using this option will not protect you from typos. See also ignore_prefer_validation. Ignore_NUMA Some processors (e.g. AMD Opteron 6000 series) contain multiple NUMA nodes per socket. This is a configuration which does not map into the hardware entities that Slurm optimizes resource allocation for (PU/thread, core, socket, baseboard, node and network switch). In order to optimize resource allocations on such hardware, Slurm will consider each NUMA node within the socket as a sepa- rate socket by default. Use the Ignore_NUMA option to re- port the correct socket count, but not optimize resource allocations on the NUMA nodes. NOTE: Since hwloc 2.0 NUMA Nodes are are not part of the main/CPU topology tree, because of that if Slurm is build with hwloc 2.0 or above Slurm will treat HWLOC_OBJ_PACK- AGE as Socket, you can change this behavior using Slurmd- Parameters=l3cache_as_socket. ignore_prefer_validation If set, and a job requests --prefer any features in the request that would create an invalid request with the current system will not generate an error. This is help- ful for dynamic systems where nodes with features come and go. Please note using this option will not protect you from typos. See also ignore_constraint_validation. max_array_tasks Specify the maximum number of tasks that can be included in a job array. The default limit is MaxArraySize, but this option can be used to set a lower limit. For exam- ple, max_array_tasks=1000 and MaxArraySize=100001 would permit a maximum task ID of 100000, but limit the number of tasks in any single job array to 1000. max_rpc_cnt=If the number of active threads in the slurmctld daemon is equal to or larger than this value, defer scheduling of jobs. The scheduler will check this condition at certain points in code and yield locks if necessary. This can improve Slurm's ability to process requests at a cost of initiat- ing new jobs less frequently. Default: 0 (option dis- abled), Min: 0, Max: 1000. NOTE: The maximum number of threads (MAX_SERVER_THREADS) is internally set to 256 and defines the number of served RPCs at a given time. Setting max_rpc_cnt to more than 256 will be only useful to let backfill continue schedul- ing work after locks have been yielded (i.e. each 2 sec- onds) if there are a maximum of MAX(max_rpc_cnt/10, 20) RPCs in the queue. i.e. max_rpc_cnt=1000, the scheduler will be allowed to continue after yielding locks only when there are less than or equal to 100 pending RPCs. If a value is set, then a value of 10 or higher is recom- mended. It may require some tuning for each system, but needs to be high enough that scheduling isn't always dis- abled, and low enough that requests can get through in a reasonable period of time. max_sched_time=How long, in seconds, the main scheduling loop will run before exiting. Note that all other Slurm operations, including responses to RPCs, will be deferred while the scheduling loop is running. Defaults to 2 seconds in most cases, or 1 second if Mes- sageTimeout is set to 3 or less. The maximum value is half of MessageTimeout. Larger values will be replaced with the applicable default value. NOTE: A higher value will allow the main scheduler to evaluate more pending jobs per cycle. If this timeout is reached, some low priority pending jobs will not be eval- uated, which can leave their reason for pending as 'None' until they can be evaluated in a future scheduling cycle. max_script_size=Specify the maximum size of a batch script, in bytes. The default value is 4 megabytes. Larger values may ad- versely impact system performance. max_submit_line_size=Specify the maximum size of a submit line, in bytes. The default value is 1 megabtye. This option cannot ex- ceed 2 megabytes. max_switch_wait=Maximum number of seconds that a job can delay execution waiting for the specified desired switch count. The default value is 300 seconds. no_backup_scheduling If used, the backup controller will not schedule jobs when it takes over. The backup controller will allow jobs to be submitted, modified and cancelled but won't sched- ule new jobs. This is useful in Cray environments when the backup controller resides on an external Cray node. nohold_on_prolog_fail By default, if the Prolog exits with a non-zero value the job is requeued in a held state. By specifying this para- meter the job will be requeued but not held so that the scheduler can dispatch it to another host. pack_serial_at_end If used with the select/cons_tres plugin, then put serial jobs at the end of the available nodes rather than using a best fit algorithm. This may reduce resource fragmen- tation for some workloads. partition_job_depth=The default number of jobs to attempt sched- uling (i.e. the queue depth) from each partition/queue in Slurm's main scheduling logic. This limit will be enforced for all main sched- uler cycles. The functionality is similar to that pro- vided by the bf_max_job_part option for the backfill scheduling logic. The default value is 0 (no limit). Job's excluded from attempted scheduling based upon par- tition will not be counted against the de- fault_queue_depth limit. Also see the bf_max_job_part option. reduce_completing_frag This option is used to control how scheduling of re- sources is performed when jobs are in the COMPLETING state, which influences potential fragmentation. If this option is not set then no jobs will be started in any partition when any job is in the COMPLETING state for less than CompleteWait seconds. If this option is set then no jobs will be started in any individual partition that has a job in COMPLETING state for less than Com- pleteWait seconds. In addition, no jobs will be started in any partition with nodes that overlap with any nodes in the partition of the completing job. This option is to be used in conjunction with CompleteWait. NOTE: CompleteWait must be set in order for this to work. If CompleteWait=0 then this option does nothing. NOTE: reduce_completing_frag only affects the main sched- uler, not the backfill scheduler. requeue_delay= Delay before a non-Expedited Requeue job is eligible to run after being requeued. Defaults to the Au- thInfo=cred_expire setting, which itself defaults to 120 seconds. requeue_on_resume_failure In the event that nodes fail to resume by ResumeTimeout, all batch jobs will be requeued -- even if the jobs re- quested not to be requeued. This is similar to Pro- logFlags=ForceRequeueOnFail. salloc_wait_nodes If defined, the salloc command will wait until all allo- cated nodes are ready for use (i.e. booted) before the command returns. By default, salloc will return as soon as the resource allocation has been made. The salloc com- mand can use the --wait-all-nodes option to override this configuration parameter. sbatch_wait_nodes If defined, the sbatch script will wait until all allo- cated nodes are ready for use (i.e. booted) before the initiation. By default, the sbatch script will be initi- ated as soon as the first node in the job allocation is ready. The sbatch command can use the --wait-all-nodes option to override this configuration parameter. sched_interval=How frequently, in seconds, the main scheduling loop will execute and test all pending jobs, with only the partition_job_depth limit in place. The default value is 60 seconds. A setting of -1 will disable the main scheduling loop. sched_max_job_start=The maximum number of jobs that the main scheduling logic will start in any single execution. The default value is zero, which im- poses no limit. sched_min_interval=How frequently, in microseconds, the main scheduling loop will execute and test any pending jobs. The scheduler runs in a limited fash- ion every time that any event happens which could enable a job to start (e.g. job submit, job terminate, etc.). If these events happen at a high frequency, the scheduler can run very frequently and consume significant resources if not throttled by this option. This option specifies the minimum time between the end of one scheduling cycle and the beginning of the next scheduling cycle. A value of zero will disable throttling of the scheduling logic interval. The default value is 2 microseconds. spec_cores_first Specialized cores will be selected from the first cores of the first sockets, cycling through the sockets on a round robin basis. By default, specialized cores will be selected from the last cores of the last sockets, cycling through the sockets on a round robin basis. step_retry_count=When a step completes and there are steps end- ing resource allocation, then retry step allocations for at least this number of pend- ing steps. Also see step_retry_time. The default value is 8 steps. step_retry_time=When a step completes and there are steps ending resource allocation, then retry step allocations for all steps which have been pending for at least this number of seconds. Also see step_retry_count. The default value is 60 seconds. time_min_as_soft_limit Treat the --time-min limit as a soft time limit for the job. Scheduling will plan for the shorter duration, while permitting the job to continue running until the ("hard") --time limit. whole_hetjob Requests to cancel, hold or release any component of a heterogeneous job will be applied to all components of the job. NOTE: This option was previously named whole_pack and this is still supported for backwards compatibility. SchedulerTimeSlice Number of seconds in each time slice when gang scheduling is en- abled (PreemptMode=SUSPEND,GANG). The value must be between 5 seconds and 65533 seconds. The default value is 30 seconds. SchedulerType Identifies the type of scheduler to be used. The scontrol com- mand can be used to manually change job priorities if desired. Acceptable values include: sched/backfill For a backfill scheduling module to augment the default FIFO scheduling. Backfill scheduling will initiate lower-priority jobs if doing so does not delay the ex- pected initiation time of any higher priority job. Ef- fectiveness of backfill scheduling is dependent upon users specifying job time limits, otherwise all jobs will have the same time limit and backfilling is impossible. Note documentation for the SchedulerParameters option above. This is the default configuration. sched/builtin This is the FIFO scheduler which initiates jobs in prior- ity order. If any job in the partition can not be sched- uled, no lower priority job in that partition will be scheduled. An exception is made for jobs that can not run due to partition constraints (e.g. the time limit) or down/drained nodes. In that case, lower priority jobs can be initiated and not impact the higher priority job. ScronParameters Multiple options may be comma separated. enable Enable the use of scrontab to submit and manage periodic repeating jobs. explicit_scancel When cancelling an scrontab job, require the user to ex- plicitly request cancelling the job with the --cron flag in scancel. SelectType Identifies the type of resource selection algorithm to be used. When changed, all job information (running and pending) will be lost, since the job state save format used by each plugin is different. The only exception to this is when changing from the legacy cons_res to cons_tres. Acceptable values include select/cons_tres The resources (cores, memory, GPUs and all other track- able resources) within a node are individually allocated as consumable resources. Note that whole nodes can be allocated to jobs for selected partitions by using the OverSubscribe=Exclusive option. See the partition Over- Subscribe parameter for more information. This is the default value. select/linear for allocation of entire nodes assuming a one-dimensional array of nodes in which sequentially ordered nodes are preferable. For a heterogeneous cluster (e.g. different CPU counts on the various nodes), resource allocations will favor nodes with high CPU counts as needed based upon the job's node and CPU specification if TopologyPlu- gin=topology/flat is configured. Use of other topology plugins with select/linear and heterogeneous nodes is not recommended and may result in valid job allocation re- quests being rejected. The linear plugin is not designed to track generic resources on a node. In cases where generic resources (such as GPUs) need to be tracked, the cons_tres plugin should be used instead. SelectTypeParameters The permitted values of SelectTypeParameters depend upon the configured value of SelectType. The only supported options for SelectType=select/linear are CR_ONE_TASK_PER_CORE and CR_Memory, which treats memory as a consumable resource and prevents memory over subscription with job preemption or gang scheduling. By default SelectType=select/linear allocates whole nodes to jobs without considering their memory consumption. By default Se- lectType=select/cons_tres uses CR_Core_Memory, which allocates Core to jobs while considering their memory consumption. The following options are supported by the SelectType=se- lect/cons_tres plugin: CR_CPU CPUs are consumable resources. Configure the number of CPUs on each node, which may be equal to the count of cores or hyper-threads on the node depending upon the de- sired minimum resource allocation. The node's Boards, Sockets, CoresPerSocket and ThreadsPerCore may optionally be configured and result in job allocations which have improved locality; however doing so will prevent more than one job from being allocated on each core. CR_CPU_Memory CPUs and memory are consumable resources. Configure the number of CPUs on each node, which may be equal to the count of cores or hyper-threads on the node depending upon the desired minimum resource allocation. The node's Boards, Sockets, CoresPerSocket and ThreadsPerCore may optionally be configured and result in job allocations which have improved locality; however doing so will pre- vent more than one job from being allocated on each core. Setting a value for DefMemPerCPU is strongly recommended. CR_Core Cores are consumable resources. On nodes with hy- per-threads, each thread is counted as a CPU to satisfy a job's resource requirement, but multiple jobs are not al- located threads on the same core. The count of CPUs al- located to a job is rounded up to account for every CPU on an allocated core. This will also impact total allo- cated memory when --mem-per-cpu is used to be multiply of total number of CPUs on allocated cores. CR_Core_Memory Cores and memory are consumable resources. On nodes with hyper-threads, each thread is counted as a CPU to satisfy a job's resource requirement, but multiple jobs are not allocated threads on the same core. The count of CPUs allocated to a job may be rounded up to account for every CPU on an allocated core. Setting a value for DefMemPer- CPU is strongly recommended. CR_ONE_TASK_PER_CORE Allocate one task per core by default. Without this op- tion, by default one task will be allocated per thread on nodes with more than one ThreadsPerCore configured. NOTE: This option cannot be used with CR_CPU*. CR_CORE_DEFAULT_DIST_BLOCK Allocate cores within a node using block distribution by default. This is a pseudo-best-fit algorithm that mini- mizes the number of boards and minimizes the number of sockets (within minimum boards) used for the allocation. This default behavior can be overridden specifying a par- ticular "-m" parameter with srun/salloc/sbatch. Without this option, cores will be allocated cyclically across the sockets. CR_LLN Schedule resources to jobs on the least loaded nodes (based upon the number of idle CPUs). This is generally only recommended for an environment with serial jobs as idle resources will tend to be highly fragmented, result- ing in parallel jobs being distributed across many nodes. Note that node Weight takes precedence over how many idle resources are on each node. Also see the partition con- figuration parameter LLN use the least loaded nodes in selected partitions. CR_Pack_Nodes If a job allocation contains more resources than will be used for launching tasks (e.g. if whole nodes are allo- cated to a job), then rather than distributing a job's tasks evenly across its allocated nodes, pack them as tightly as possible on these nodes. For example, con- sider a job allocation containing two entire nodes with eight CPUs each. If the job starts ten tasks across those two nodes without this option, it will start five tasks on each of the two nodes. With this option, eight tasks will be started on the first node and two tasks on the second node. This can be superseded by "NoPack" in srun's "--distribution" option. CR_Pack_Nodes only ap- plies when the "block" task distribution method is used. LL_SHARED_GRES When allocating resources for a shared GRES (gres/mps, gres/shard), prefer least loaded device (in terms of al- ready allocated fraction). This way jobs are spread across GRES devices on the node, instead of the default behavior where the first available device is used. This option is only supported by select/cons_tres plugin. CR_Socket Sockets are consumable resources. On nodes with multiple cores, each core or thread is counted as a CPU to satisfy a job's resource requirement, but multiple jobs are not allocated resources on the same socket. CR_Socket_Memory Memory and sockets are consumable resources. On nodes with multiple cores, each core or thread is counted as a CPU to satisfy a job's resource requirement, but multiple jobs are not allocated resources on the same socket. Setting a value for DefMemPerCPU is strongly recommended. MULTIPLE_SHARING_GRES_PJ By default, only one sharing gres per job is allowed on each node from shared gres requests. This allows multiple sharing gres' to be used on a single node to satisfy shared gres requirements per job. Example: If there are 10 shards to a gpu and 12 shards are requested, instead of being denied the job will be allocated with 2 gpus. 1 using 10 shards and the other using 2 shards. ENFORCE_BINDING_GRES Set --gres-flags=enforce-binding as the default in every job. This can be overridden with --gres-flags=dis- able-binding. ONE_TASK_PER_SHARING_GRES Set --gres-flags=one-task-per-sharing as the default in every job. This can be overridden with --gres-flags=mul- tiple-tasks-per-sharing. NOTE: If memory isn't configured as a consumable resource (CR_CPU, CR_Core or CR_Socket without _Memory) memory can be oversubscribed and will not be constrained by task/cgroup even if it is configured in cgroup.conf. In this case the --mem op- tion is only used to filter out nodes with lower configured mem- ory and does not take running jobs into account. For instance, two jobs requesting all the memory of a node can run at the same time. SlurmctldAddr An optional address to be used for communications to the cur- rently active slurmctld daemon, normally used with Virtual IP addressing of the currently active server. If this parameter is not specified then each primary and backup server will have its own unique address used for communications as specified in the SlurmctldHost parameter. If this parameter is specified then the SlurmctldHost parameter will still be used for communica- tions to specific slurmctld primary or backup servers, for exam- ple to cause all of them to read the current configuration files or shutdown. Also see the SlurmctldPrimaryOffProg and Slurm- ctldPrimaryOnProg configuration parameters to configure programs to manipulate virtual IP address manipulation. SlurmctldDebug The level of detail to provide slurmctld daemon's logs. The de- fault value is info. If the slurmctld daemon is initiated with -v or --verbose options, that debug level will be preserved or restored upon reconfiguration. quiet Log nothing fatal Log only fatal errors error Log only errors info Log errors and general informational messages verbose Log errors and verbose informational messages debug Log errors and verbose informational messages and de- bugging messages debug2 Log errors and verbose informational messages and more debugging messages debug3 Log errors and verbose informational messages and even more debugging messages debug4 Log errors and verbose informational messages and even more debugging messages debug5 Log errors and verbose informational messages and even more debugging messages SlurmctldHost The short, or long, hostname of the machine where Slurm control daemon is executed (i.e. the name returned by the command "host- name -s"). This hostname is optionally followed by either the IP address or a name by which the address can be identified, en- closed in parentheses. e.g. SlurmctldHost=slurmctl-primary(12.34.56.78) Each host running an instance of slurmctld should have a Slurm- ctldHost= entry. e.g. SlurmctldHost=slurmctl-primary1 SlurmctldHost=slurmctl-primary2 SlurmctldHost=slurmctl-primary3(12.34.56.78) SlurmctldHost must be specified at least once. If specified more than once, the first entry will run as the primary and all other entries as standby backups. If the primary host fails, the first backup will change from standby to primary until the first host comes back online. This same process will repeat if the new primary fails. Slurm daemons need to be reconfigured (e.g. "scontrol reconfig") for changes to this parameter to take effect. It is okay for jobs to be running when making these changes, as the running steps will get the updated SlurmctldHost info. Every slurmctld host controller must have access to the State- SaveLocation directory, which must be readable and writable from the primary and all backup controllers at all times. Refer to the RELOCATING CONTROLLERS section if you need to change this. SlurmctldLogFile Fully qualified pathname of a file into which the slurmctld dae- mon's logs are written. The default value is none (performs logging via syslog). See the section LOGGING if a pathname is specified. SlurmctldParameters Multiple options may be comma separated. allow_user_triggers Permit setting triggers from non-root/slurm_user users. SlurmUser must also be set to root to permit these trig- gers to work. See the strigger man page for additional details. cloud_dns By default, Slurm expects that the network address for a cloud node won't be known until the creation of the node and that Slurm will be notified of the node's address (e.g. scontrol update nodename=<name> nodeaddr=<addr>). Since Slurm communications rely on the node configuration found in the slurm.conf, Slurm will tell the client com- mand, after waiting for all nodes to boot, each node's ip address. However, in environments where the nodes are in DNS, this step can be avoided by configuring this option. conmgr_max_connections=<connection_count> Specify the maximum number of connections to be processed at any given time. This does not influence the maximum number of pending connections as that is controlled by the kernel. Increasing this value will increase slurm- ctld's memory footprint. Sites are advised to monitor memory consumption when increasing this value. Defaults to 512. conmgr_threads=<thread_count> The number of process threads in thread pool used for re- ceiving and processing connections on the listening sock- ets. In most cases, you should decrease conmgr_threads to improve scheduling performance. conmgr_use_poll Use poll(2) instead of epoll(7) for monitoring file de- scriptors. conmgr_connect_timeout=<seconds> Wait <seconds> before considering an outbound connection attempt to be timed out. Defaults to the value of Mes- sageTimeout. conmgr_read_timeout=<seconds> Wait <seconds> before considering a read from a file de- scriptor to be timed out. Defaults to the value of Mes- sageTimeout. conmgr_quiesce_timeout=<seconds> Wait <seconds> before considering quiesce to be timed out. Upon timeout, all (non-listening) active connections will be closed to allow the quiesce to start. Defaults to two times value of MessageTimeout. conmgr_wait_write_delay=<seconds> When waiting for kernel to flush outgoing buffer, poll kernel for changes every <seconds> for changes. Defaults to the value of MessageTimeout. conmgr_write_timeout=<seconds> Wait <seconds> before considering a write from a file de- scriptor to be timed out. Defaults to the value of Mes- sageTimeout. disable_triggers Disable the ability to register new triggers. enable_async_reply Enable slurmctld to reply to incoming (supported) RPCs asynchronously without blocking a thread in the conmgr thread pool. enable_configless Permit "configless" operation by the slurmd, slurmstepd, and user commands. When enabled the slurmd will be per- mitted to retrieve config files and Prolog, Epilog, TaskProlog, and TaskEpilog scripts from the slurmctld, and on any 'scontrol reconfigure' command new configs and scripts will be automatically pushed out and applied to nodes that are running in this "configless" mode. See https://slurm.schedmd.com/configless_slurm.html for more details. NOTE: Included files with the Include directive will only be pushed if the filename has no path separators and is located adjacent to slurm.conf. NOTE: Prolog and Epilog scripts will only be pushed if the filenames have no path separators and are located ad- jacent to slurm.conf. Glob patterns (See glob (7)) are not supported. enable_expedited_requeue Allow jobs to request an expedited requeue on certain events. An expedited requeue ensures that the job is im- mediately eligible to run and gets placed at the top of the queue. idle_on_node_suspend Mark nodes as idle, regardless of current state, when suspending nodes with SuspendProgram so that nodes will be eligible to be resumed at a later time. node_reg_mem_percent=Percentage of memory a node is allowed to register with without being marked as invalid with low memory. Default is 100. For State=CLOUD nodes, the default is 90. To disable this for cloud nodes set it to 100. config_overrides takes precedence over this option. It's recommended that task/cgroup with ConstrainRamSpace is configured. A memory cgroup limit won't be set more than the actual memory on the node. If needed, configure AllowedRamSpace in the cgroup.conf to add a buffer. no_quick_restart By default starting a new instance of the slurmctld will kill the old one running before taking control. If this option is set this will not happen without the -i option. power_save_interval How often the power_save thread looks to resume and sus- pend nodes. The power_save thread will do work sooner if there are node state changes. Default is 10 seconds. power_save_min_interval How often the power_save thread, at a minimum, looks to resume and suspend nodes. Default is 0. max_powered_nodes The max number of powered up nodes across the cluster. Once this is reached, jobs requesting additional nodes will not start, and "scontrol power up <nodes>" will fail. max_dbd_msg_action Action used once MaxDBDMsgs is reached, options are 'dis- card' (default) and 'exit'. When 'discard' is specified and MaxDBDMsgs is reached we start by purging pending messages of types Step start and complete, and it reaches MaxDBDMsgs again Job start mes- sages are purged. Job completes and node state changes continue to consume the empty space created from the purgings until MaxDBDMsgs is reached again at which no new message is tracked creating data loss and potentially runaway jobs. When 'exit' is specified and MaxDBDMsgs is reached the slurmctld will exit instead of discarding any messages. It will be impossible to start the slurmctld with this option where the slurmdbd is down and the slurmctld is tracking more than MaxDBDMsgs. reboot_from_controller Run the RebootProgram from the controller instead of on the slurmds. The RebootProgram will be passed a comma-separated list of nodes to reboot as the first ar- gument and if applicable the required features needed for reboot as the second argument. reconfig_on_restart Every restart of slurmctld (process restart not triggered by "scontrol reconfigure") will trigger a reconfiguration request to all slurmd and sackd daemons. For "configless" systems this will ensure all processes are running the current configuration. NOTE: Use with caution when performing rolling upgrades as this could inadvertently trigger an upgrade of the slurmd or sackd daemons earlier than intended. rl_bucket_size= Size of the token bucket. This permits a certain amount of RPC burst from a user before the steady-state rate limit takes effect. The default value is 30. rl_enable Enable per-user RPC rate-limiting support. Client-com- mands will be told to back off and sleep for a second once the limit has been reached. This is implemented as a "token bucket", which permits a certain degree of "bursty" RPC load from an individual user before holding them to a steady-state RPC load established by the refill period and rate. rl_log_freq= The maximum frequency (in seconds) for which logs about RPC limit being exceeded by an individual user are printed to the logs. Set to 0 to see every incidence. Set to -1 to disable the log message entirely. The de- fault value is 0. rl_refill_period= How frequently, in seconds, in which additional tokens are added to each user bucket. The default value is 1. rl_refill_rate= How many tokens to add to the bucket on each period. The default value is 2. rl_table_size= Number of entries in the user hash-table. Recommended value should be at least twice the number of active user accounts on the system. The default value is 8192. enable_stepmgr Enable slurmstepd step management system wide. This en- ables job steps to be managed by a single extern slurm- stepd associated with the job to manage steps. This is beneficial for jobs that submit many steps inside their allocations. PrologFlags=contain must be set. user_resv_delete Allow any user able to run in a reservation to delete it. validate_nodeaddr_threads= During startup, slurmctld looks up the address for each compute node in the system. On large systems this can cause considerable delay, this option permits the slurm- ctld to concurrently handle the lookup calls and can re- duce system startup time considerably. The default value is 1. Maximum permitted value is 64. SlurmctldPidFile Fully qualified pathname of a file into which the slurmctld dae- mon may write its process id. This may be used for automated signal processing. The default value is "/var/run/slurm- ctld.pid". SlurmctldPort The port number that the Slurm controller, slurmctld, listens to for work. The default value is SLURMCTLD_PORT as established at system build time. If none is explicitly specified, it will be set to 6817. SlurmctldPort may also be configured to support a range of port numbers in order to accept larger bursts of incom- ing messages by specifying two numbers separated by a dash (e.g. SlurmctldPort=6817-6818). NOTE: Either slurmctld and slurmd daemons must not execute on the same nodes or the values of SlurmctldPort and SlurmdPort must be different. NOTE: On Cray systems, Realm-Specific IP Addressing (RSIP) will automatically try to interact with anything opened on ports 8192-60000. Configure SlurmctldPort to use a port outside of the configured SrunPortRange and RSIP's port range. SlurmctldPrimaryOffProg This program is executed when a slurmctld daemon running as the primary server becomes a backup server. The controller will wait for this script to end before fully shutting down. By default no program is executed. See also the related "SlurmctldPrimaryOn- Prog" parameter. SlurmctldPrimaryOnProg This program is executed when a slurmctld daemon running as a backup server becomes the primary server. The controller will wait for this script to end before fully starting up. By default no program is executed. When using virtual IP addresses to man- age High Available Slurm services, this program can be used to add the IP address to an interface (and optionally try to kill the unresponsive slurmctld daemon and flush the ARP caches on nodes on the local Ethernet fabric). See also the related "SlurmctldPrimaryOffProg" parameter. SlurmctldSyslogDebug The slurmctld daemon will log events to the syslog file at the specified level of detail. If not set, the slurmctld daemon will log to syslog at level fatal, unless there is no SlurmctldLog- File and it is running in the background, in which case it will log to syslog at the level specified by SlurmctldDebug (at fatal in the case that SlurmctldDebug is set to quiet) or it is run in the foreground, when it will be set to quiet. quiet Log nothing fatal Log only fatal errors error Log only errors info Log errors and general informational messages verbose Log errors and verbose informational messages debug Log errors and verbose informational messages and de- bugging messages debug2 Log errors and verbose informational messages and more debugging messages debug3 Log errors and verbose informational messages and even more debugging messages debug4 Log errors and verbose informational messages and even more debugging messages debug5 Log errors and verbose informational messages and even more debugging messages NOTE: By default, Slurm's systemd service file starts the slurm- ctld daemon in the foreground with the --systemd option. This means that systemd will capture stdout/stderr output and print that to syslog, independent of Slurm printing to syslog di- rectly. To prevent systemd from doing this, add "StandardOut- put=null" and "StandardError=null" to the respective service files or override files. SlurmctldTimeout The interval, in seconds, that the backup controller waits for the primary controller to respond before assuming control. The default value is 120 seconds. May not exceed 65533. SlurmdDebug The level of detail to provide slurmd daemon's logs. The de- fault value is info. quiet Log nothing fatal Log only fatal errors error Log only errors info Log errors and general informational messages verbose Log errors and verbose informational messages debug Log errors and verbose informational messages and de- bugging messages debug2 Log errors and verbose informational messages and more debugging messages debug3 Log errors and verbose informational messages and even more debugging messages debug4 Log errors and verbose informational messages and even more debugging messages debug5 Log errors and verbose informational messages and even more debugging messages SlurmdLogFile Fully qualified pathname of a file into which the slurmd dae- mon's logs are written. The default value is none (performs logging via syslog). The first "%h" within the name is replaced with the hostname on which the slurmd is running. The first "%n" within the name is replaced with the Slurm node name on which the slurmd is running. See the section LOGGING if a pathname is specified. SlurmdParameters Parameters specific to the Slurmd. Multiple options may be comma separated. NOTE: Additional node-specific parameters can be specified using the Parameters option in individual node definitions. allow_ecores If set, and processors on your nodes have E-Cores, allows them to be used in for scheduling and task placement. (By default, E-Cores are ignored.) config_overrides If set, consider the configuration of each node to be that specified in the slurm.conf configuration file and any node with less than the configured resources will not be set to INVAL/INVALID_REG. This option is generally only useful for testing purposes. Equivalent to the now deprecated FastSchedule=2 option. conmgr_max_connections=<connection_count> Specify the maximum number of connections to be processed at any given time. This does not influence the maximum number of pending connections as that is controlled by the kernel. Increasing this value will increase slurmd's memory footprint. Sites are advised to monitor memory consumption when increasing this value. Defaults to 150. conmgr_threads=<thread_count> The number of process threads in thread pool used for re- ceiving and processing connections on the listening sock- ets. In most cases you should decrease conmgr_threads to improve scheduling performance. Default value is 6 threads. conmgr_use_poll Use poll(2) instead of epoll(7) for monitoring file de- scriptors. conmgr_connect_timeout=<seconds> Wait <seconds> before considering an outbound connection attempt to be timed out. Defaults to the value of Mes- sageTimeout. conmgr_read_timeout=<seconds> Wait <seconds> before considering a read from a file de- scriptor to be timed out. Defaults to the value of Mes- sageTimeout. conmgr_quiesce_timeout=<seconds> Wait <seconds> before considering quiesce to be timed out. Upon timeout, all (non-listening) active connections will be closed to allow the quiesce to start. Defaults to two times value of MessageTimeout. conmgr_wait_write_delay=<seconds> When waiting for kernel to flush outgoing buffer, poll kernel for changes every <seconds> for changes. Defaults to the value of MessageTimeout. conmgr_write_timeout=<seconds> Wait <seconds> before considering a write from a file de- scriptor to be timed out. Defaults to the value of Mes- sageTimeout. l3cache_as_socket Use the hwloc l3cache as the socket count. Can be useful on certain processors where the socket level is too coarse, and the l3cache may provide better task distribu- tion. (E.g., along CCX boundaries instead of socket boundaries.) Mutually exclusive with numa_node_as_socket. Requires hwloc v2. numa_node_as_socket Use the hwloc NUMA Node to determine main hierarchy ob- ject to be used as socket. If the option is set Slurm will check the parent object of NUMA Node and use it as socket. This option may be useful for architectures likes AMD Epyc, where number of nodes per socket may be config- ured. Mutually exclusive with l3cache_as_socket. Re- quires hwloc v2. shutdown_on_reboot If set, the Slurmd will shut itself down when a reboot request is received. contain_spank If set and a job_container plugin is specified, the spank_user(), spank_task_post_fork() and spank_task_exit() calls will be run inside the job con- tainer. SlurmdPidFile Fully qualified pathname of a file into which the slurmd daemon may write its process id. This may be used for automated signal processing. The first "%h" within the name is replaced with the hostname on which the slurmd is running. The first "%n" within the name is replaced with the Slurm node name on which the slurmd is running. The default value is "/var/run/slurmd.pid". SlurmdPort The port number that the Slurm compute node daemon, slurmd, lis- tens to for work. The default value is SLURMD_PORT as estab- lished at system build time. If none is explicitly specified, its value will be 6818. NOTE: Either slurmctld and slurmd dae- mons must not execute on the same nodes or the values of Slurm- ctldPort and SlurmdPort must be different. NOTE: On Cray systems, Realm-Specific IP Addressing (RSIP) will automatically try to interact with anything opened on ports 8192-60000. Configure SlurmdPort to use a port outside of the configured SrunPortRange and RSIP's port range. SlurmdSpoolDir Fully qualified pathname of a directory into which the slurmd daemon's state information and batch job script information are written. This must be a common pathname for all nodes, but should represent a directory which is local to each node (refer- ence a local file system). The default value is "/var/spool/slurmd". The first "%h" within the name is replaced with the hostname on which the slurmd is running. The first "%n" within the name is replaced with the Slurm node name on which the slurmd is running. SlurmdSyslogDebug The slurmd daemon will log events to the syslog file at the specified level of detail. If not set, the slurmd daemon will log to syslog at level fatal, unless there is no SlurmdLogFile and it is running in the background, in which case it will log to syslog at the level specified by SlurmdDebug (at fatal in the case that SlurmdDebug is set to quiet) or it is run in the fore- ground, when it will be set to quiet. quiet Log nothing fatal Log only fatal errors error Log only errors info Log errors and general informational messages verbose Log errors and verbose informational messages debug Log errors and verbose informational messages and de- bugging messages debug2 Log errors and verbose informational messages and more debugging messages debug3 Log errors and verbose informational messages and even more debugging messages debug4 Log errors and verbose informational messages and even more debugging messages debug5 Log errors and verbose informational messages and even more debugging messages NOTE: By default, Slurm's systemd service file starts the slurmd daemon in the foreground with the --systemd option. This means that systemd will capture stdout/stderr output and print that to syslog, independent of Slurm printing to syslog directly. To prevent systemd from doing this, add "StandardOutput=null" and "StandardError=null" to the respective service files or override files. SlurmdTimeout The interval, in seconds, that the Slurm controller waits for slurmd to respond before configuring that node's state to DOWN. A value of zero indicates the node will not be tested by slurm- ctld to confirm the state of slurmd, the node will not be auto- matically set to a DOWN state indicating a non-responsive slurmd, and some other tool will take responsibility for moni- toring the state of each compute node and its slurmd daemon. Slurm's hierarchical communication mechanism is used to ping the slurmd daemons in order to minimize system noise and overhead. The default value is 300 seconds. The value may not exceed 65533 seconds. SlurmdUser The name of the user that the slurmd daemon executes as. This user must exist on all nodes of the cluster for authentication of communications between Slurm components. The default value is "root", which should be kept in almost all cases so that slurmd can run jobs as the user that submitted them. SlurmSchedLogFile Fully qualified pathname of the scheduling event logging file. The syntax of this parameter is the same as for SlurmctldLog- File. In order to configure scheduler logging, set both the SlurmSchedLogFile and SlurmSchedLogLevel parameters. SlurmSchedLogLevel The initial level of scheduling event logging, similar to the SlurmctldDebug parameter used to control the initial level of slurmctld logging. Valid values for SlurmSchedLogLevel are "0" (scheduler logging disabled) and "1" (scheduler logging en- abled). If this parameter is omitted, the value defaults to "0" (disabled). In order to configure scheduler logging, set both the SlurmSchedLogFile and SlurmSchedLogLevel parameters. The scheduler logging level can be changed dynamically using scon- trol. SlurmUser The name of the user that the slurmctld daemon executes as. For security purposes, a user other than "root" is recommended. This user must exist on all nodes of the cluster for authentica- tion of communications between Slurm components. The default value is "root". SrunEpilog Fully qualified pathname of an executable to be run by srun fol- lowing the completion of a job step. The command line arguments for the executable will be the command and arguments of the job step. This configuration parameter may be overridden by srun's --epilog parameter. Note that while the other "Epilog" executa- bles (e.g., TaskEpilog) are run by slurmd on the compute nodes where the tasks are executed, the SrunEpilog runs on the node where the "srun" is executing. SrunPortRange The srun creates a set of listening ports to communicate with the controller, the slurmstepd and to handle the application I/O. By default these ports are ephemeral meaning the port num- bers are selected by the kernel. Using this parameter allow sites to configure a range of ports from which srun ports will be selected. This is useful if sites want to allow only certain port range on their network. NOTE: On Cray systems, Realm-Specific IP Addressing (RSIP) will automatically try to interact with anything opened on ports 8192-60000. Configure SrunPortRange to use a range of ports above those used by RSIP, ideally 1000 or more ports, for exam- ple "SrunPortRange=60001-63000". NOTE: SrunPortRange must be large enough to cover the expected number of srun ports created. A single srun opens 4 listening ports plus 2 more for every 48 hosts beyond the first 48. Use of the --pty option will result in an additional port being used. Example: srun -N 1 will use 4 listening ports. srun --pty -N 1 will use 5 listening ports. srun -N 48 will use 4 listening ports. srun -N 50 will use 6 listening ports. srun -N 200 will use 12 listening ports. SrunProlog Fully qualified pathname of an executable to be run by srun prior to the launch of a job step. The command line arguments for the executable will be the command and arguments of the job step. This configuration parameter may be overridden by srun's --prolog parameter. Note that while the other "Prolog" executa- bles (e.g., TaskProlog) are run by slurmd on the compute nodes where the tasks are executed, the SrunProlog runs on the node where the "srun" is executing. StateSaveLocation Fully qualified pathname of a directory into which the Slurm controller, slurmctld, saves its state (e.g. "/usr/lo- cal/slurm/checkpoint"). Slurm state will saved here to recover from system failures. SlurmUser must be able to create files in this directory. If you have a secondary SlurmctldHost config- ured, this location should be readable and writable by both sys- tems. Since all running and pending job information is stored here, the use of a reliable file system (e.g. RAID) is recom- mended. The default value is "/var/spool". If any slurm dae- mons terminate abnormally, their core files will also be written into this directory. SuspendExcNodes Specifies the nodes which are to not be placed in power save mode, even if the node remains idle for an extended period of time. Use Slurm's hostlist expression or NodeSets to identify nodes with an optional ":" separator and count of nodes to ex- clude from the preceding range. For example "nid[10-20]:4" will prevent 4 powered up nodes in the set "nid[10-20]" from being powered down. Multiple sets of nodes can be specified with or without counts in a comma separated list (e.g "nid[10-20]:4,nid[80-90]:2"). By default no nodes are excluded. This value may be updated with scontrol. See Recon- figFlags=KeepPowerSaveSettings for setting persistence. SuspendExcParts Specifies the partitions whose nodes are to not be placed in power save mode, even if the node remains idle for an extended period of time. Multiple partitions can be identified and sepa- rated by commas. By default no nodes are excluded. This value may be updated with scontrol. See ReconfigFlags=KeepPower- SaveSettings for setting persistence. SuspendExcStates Specifies node states that are not to be powered down automati- cally. Valid states include CLOUD, DOWN, DRAIN, DYNAMIC_FUTURE, DYNAMIC_NORM, FAIL, INVALID_REG, MAINTENANCE, NOT_RESPONDING, PERFCTRS, PLANNED, and RESERVED. By default, any of these states, if idle for SuspendTime, would be powered down. This value may be updated with scontrol. See ReconfigFlags=KeepPow- erSaveSettings for setting persistence. SuspendProgram SuspendProgram is the program that will be executed when a node remains idle for an extended period of time. This program is expected to place the node into some power save mode. This can be used to reduce the frequency and voltage of a node or com- pletely power the node off. The program executes as SlurmUser. The argument to the program will be the names of nodes to be placed into power savings mode (using Slurm's hostlist expres- sion format). By default, no program is run. Programs will be killed if they run longer than the largest configured, global or partition, ResumeTimeout or SuspendTimeout. SuspendRate The rate at which nodes are placed into power save mode by Sus- pendProgram. The value is number of nodes per minute and it can be used to prevent a large drop in power consumption (e.g. after a large job completes). A value of zero results in no limits being imposed. The default value is 60 nodes per minute. SuspendTime Nodes which remain idle or down for this number of seconds will be placed into power save mode by SuspendProgram. Setting Sus- pendTime to anything but INFINITE (or -1) will enable power save mode. INFINITE is the default. SuspendTimeout Maximum time permitted (in seconds) between when a node suspend request is issued and when the node is shutdown. At that time the node must be ready for a resume request to be issued as needed for new work. The default value is 30 seconds. SwitchParameters Optional parameters for the switch plugin. On HPE Slingshot systems configured with SwitchType=switch/hpe_slingshot, the following parameters are supported (separate multiple parameters with a comma): vnis=<min>-<max> Range of VNIs to allocate for jobs and applications. The default value is 1024-65535. destroy_retries=<retry attempts> Configure the number of times destroying CXI services is retried at the end of the step. There is a one second pause between each retry. The default value is 5. tcs=<class1>[:<class2>]... Set of traffic classes to configure for applications. Supported traffic classes are DEDICATED_ACCESS, LOW_LA- TENCY, BULK_DATA, and BEST_EFFORT. The traffic classes may also be specified as TC_DEDICATED_ACCESS, TC_LOW_LA- TENCY, TC_BULK_DATA, and TC_BEST_EFFORT. single_node_vni=<all|user|none> If set to 'all', allocate a VNI for all job steps (by de- fault, no VNI will be allocated for single-node job steps). If set to 'user', allocate a VNI for single-node job steps using the srun --network=single_node_vni option or SLURM_NETWORK=single_node_vni environment variable. If set to 'none' (or if single_node_vni is not set), do not allocate any VNI for single-node job steps. For backwards compatibility, setting single_node_vni with no argument is equivalent to 'all'. job_vni=<all|user|none> If set to 'all', allocate an additional VNI for jobs, shared among all job steps. If set to 'user', allocate an additional VNI for any job using the srun --net- work=job_vni option or SLURM_NETWORK=job_vni environment variable. If set to 'none' (or if job_vni is not set), do not allocate any additional VNI for jobs. For back- wards compatibility, setting job_vni with no argument is equivalent to 'all'. adjust_limits If set, slurmd will set an upper bound on network re- source reservations by taking the per-NIC maximum re- source quantity and subtracting the reserved or used val- ues (whichever is higher) for any system network ser- vices; this is the default. no_adjust_limits If set, slurmd will calculate network resource reserva- tions based only upon the per-resource configuration de- fault and number of tasks in the application; it will not set an upper bound on those reservation requests based on resource usage of already-existing system network ser- vices. Setting this will mean more application launches could fail based on network resource exhaustion, but if the application absolutely needs a certain amount of re- sources to function, this option will ensure that. hwcoll_addrs_per_job The number of Slingshot hardware collectives multicast addresses to allocate per job. (That are larger than hw- coll_min_nodes nodes) hwcoll_num_nodes The minimum number of nodes for a job to be allocated Slingshot hardware collectives. Because the hardware col- lective engine is not expected to offer a meaningful per- formance boost for jobs spanning a small number of nodes. fm_url If set, slurm will use the configured URL to interface with the fabric manager to enable Slingshot hardware col- lectives. Note enable_stepmgr needs to be set for hard- ware collectives to run. fm_auth HPE fabric manager REST API authentication type (BASIC or OAUTH, default OAUTH). fm_authdir Directory containing authentication info files (default /etc/fmsim for BASIC authentication, /etc/wlm-client-auth for OAUTH authentication). fm_mtls_url This sets an alternative URL to fm_url that slurm daemons will use to interface with the fabric manager to enable Slingshot hardware collectives when mTLS authentication is enabled. If this is not set, fm_url will be used in- stead. To enable mTLS authentication see fm_mtls_ca, fm_mtls_cert, and fm_mtls_key. Note: Setting fm_url and enable_stepmgr are required to enable Slingshot hardware collectives. fm_mtls_ca Path to Certificate Authority (CA) bundle file or direc- tory containing a file signed by the fabric manager cer- tificate. If set, the identity of the fabric manager server will be verified if Slingshot hardware collectives are enabled. See also fm_mtls_cert and fm_mtls_key. Note: This option is not required to enable mTLS authen- tication with the fabric manager. However, without it the client (slurmctld and stepmgr processes) will not be able to verify the server identity. fm_mtls_cert Path to client public certificate. This is required to enable mTLS authentication with the fabric manager when Slingshot hardware collectives are enabled. See also fm_mtls_ca and fm_mtls_key. fm_mtls_key Path to client private key. This is required to enable mTLS authentication to the fabric manager when Slingshot hardware collectives are enabled. See also fm_mtls_ca and fm_mtls_cert. nic_distribution_count=<val> The default number of NICs users will evenly distribute their tasks over. Users can override this value by using --network=nic_distribution_count=<val> option or the SLURM_NETWORK=nic_distribution_count=<val> environment variable. Defaults to the number of NICs on each node. def_<rsrc>=<val> Per-CPU reserved allocation for this resource. res_<rsrc>=<val> Per-node reserved allocation for this resource. If set, overrides the per-CPU allocation. max_<rsrc>=<val> Maximum per-node application for this resource. The resources that may be configured are: txqs Transmit command queues. The default is 2 per-CPU, maxi- mum 1024 per-node. tgqs Target command queues. The default is 1 per-CPU, maximum 512 per-node. eqs Event queues. The default is 2 per-CPU, maximum 2047 per- node. cts Counters. The default is 1 per-CPU, maximum 2047 per- node. tles Trigger list entries. The default is 1 per-CPU, maximum 2048 per-node. ptes Portable table entries. The default is 6 per-CPU, maximum 2048 per-node. les List entries. The default is 16 per-CPU, maximum 16384 per-node. acs Addressing contexts. The default is 2 per-CPU, maximum 1022 per-node. On systems configured with SwitchType=switch/nvidia_imex, the following parameters are supported: imex_channel_count Number of channels that can be configured. Channels allow nodes to create a secure method of sharing memory. The default value is 2048. By default, each job is allocated one IMEX channel that is accessible by the batch, interactive, and normal job steps on all nodes within the job. If using --net- work=unique-channel-per-segment on job submission and topology/block is configured, then each segment will be allocated one IMEX channel that is accessible by the batch, interactive, and normal job steps on all nodes within that particular segment. SwitchType Identifies the type of switch or interconnect used for applica- tion communications. The default value is no special plugin re- quiring special processing for job launch or termination (Ether- net, and InfiniBand). All Slurm daemons, commands and running jobs must be restarted or reconfigured for a change in SwitchType to take effect. If running jobs exist at the time slurmctld is restarted with a new value of SwitchType, records of all jobs in any state may be lost. Acceptable values in- clude: switch/hpe_slingshot For HPE Slingshot systems. switch/nvidia_imex For allocating unique channels within an NVIDIA IMEX domain. TaskEpilog Fully qualified pathname of a program to be executed as the slurm job's user after termination of each task. Will run inside of the job's container if configured. Should not be used for policy enforcement. See TaskProlog for execution order details. TaskPlugin Identifies the type of task launch plugin, typically used to provide resource management within a node (e.g. pinning tasks to specific processors). More than one task plugin can be specified in a comma-separated list. The prefix of "task/" is optional. Unset by default. Acceptable values include: task/affinity binds processes to specified resources using sched_setaffinity(). This enables the --cpu-bind and/or --mem-bind srun options. task/cgroup enables process containment to specified re- sources using Cgroups cpuset interface. This en- ables the --cpu-bind and/or --mem-bind srun op- tions. NOTE: see "man cgroup.conf" for configu- ration details. NOTE: It is recommended to stack task/cgroup,task/affinity to- gether when configuring TaskPlugin, and setting Constrain- Cores=yes in cgroup.conf. This setup uses the task/affinity plu- gin for setting the cpu mask for tasks and uses the task/cgroup plugin to fence tasks into the allocated cpus. TaskPluginParam Optional parameters for the task plugin. Multiple options should be comma separated. None, Sockets, Cores and Threads are mutually exclusive and treated as a last possible source of --cpu-bind default. See also Node and Partition CpuBind options. Cores Bind tasks to cores by default. Overrides automatic binding. None Perform no task binding by default. Overrides automatic binding. Sockets Bind to sockets by default. Overrides automatic binding. Threads Bind to threads by default. Overrides automatic binding. SlurmdSpecOverride If slurmd is started in a cgroup which has cpuset or mem- ory constraints, then CpuSpecList and MemSpecLimit will be set and will override the configured values. This will avoid scheduling resources from these constraints. In cgroup/v1, slurmd and slurmstepd daemons will now not be able to use any of these resources. While in normal be- havior, cgroup/v1 constrains the daemons to CpuSpecList and MemSpecLimit. SlurmdOffSpec If specialized cores or CPUs are identified for the node (i.e. the CoreSpecCount or CpuSpecList are configured for the node), then Slurm daemons running on the compute node (i.e. slurmd and slurmstepd) should run outside of those resources (i.e. specialized resources are completely un- available to Slurm daemons and jobs spawned by Slurm). OOMKillStep Set this parameter to kill the whole step in all the nodes in case an OOM event is triggered in any task of the step. This applies to entire allocations but does not apply to the external step. It can be overwritten by the user. NOTE: This parameter requires the task/cgroup plugin, Cgroups v2, and a kernel newer than 4.19. Verbose Verbosely report binding before tasks run by default. Autobind Set a default binding in the event that "auto binding" doesn't find a match. Set to Threads, Cores or Sockets (E.g. TaskPluginParam=autobind=threads). TaskProlog Fully qualified pathname of a program to be executed as the slurm job's user prior to initiation of each task. Will run in- side of the job's container if configured. Should not be used for policy enforcement. Besides the normal environment vari- ables, this has SLURM_TASK_PID available to identify the process ID of the task being started. Standard output from this program can be used to control the environment variables and output for the user program. export NAME=value Will set environment variables for the task being spawned. Everything after the equal sign to the end of the line will be used as the value for the environment variable. Ex- porting of functions is not currently sup- ported. print ... Will cause that line (without the leading "print ") to be printed to the job's stan- dard output. unset NAME Will clear environment variables for the task being spawned. The order of task prolog/epilog execution is as follows: 1. pre_launch_priv() Function in TaskPlugin 1. pre_launch() Function in TaskPlugin 2. TaskProlog System-wide per task program defined in slurm.conf 3. User prolog Job-step-specific task program defined using srun's --task-prolog option or SLURM_TASK_PROLOG environment variable 4. Task Execute the job step's task 5. User epilog Job-step-specific task program defined using srun's --task-epilog option or SLURM_TASK_EPILOG environment variable 6. TaskEpilog System-wide per task program defined in slurm.conf 7. post_term() Function in TaskPlugin TCPTimeout Time permitted for TCP connection to be established. Default value is 2 seconds. TLSParameters Comma-separated options for the TLS plugin configured by TL- SType. Supported values include: ca_cert_file= Path of certificate authority (CA) certificate. Must ex- ist on all hosts and be accessible by all Slurm compo- nents. File permissions must be 644, and owned by Slur- mUser/root. Default path is "ca_cert.pem" in the Slurm configuration directory ctld_cert_file= Path of certificate used by slurmctld. Must chain to ca_cert_file. Should only exist on host running slurm- ctld. File permissions must be 600, and owned by Slur- mUser. Default path is "ctld_cert.pem" in the Slurm configura- tion directory ctld_cert_key_file= Path of private key that accompanies ctld_cert_file. Should only exist on host running slurmctld. File permis- sions must be 600, and owned by SlurmUser. Default path is "ctld_cert_key.pem" in the Slurm configu- ration directory restd_cert_file= Path of certificate used by slurmrestd. Must chain to ca_cert_file. Should only exist on host running slurm- restd. File permissions must be 600, and owned by the user that runs slurmrestd. Default path is "restd_cert.pem" in the Slurm configura- tion directory restd_cert_key_file= Path of private key that accompanies restd_cert_file. Should only exist on host running slurmrestd. File per- missions must be 600, and owned by the user that runs slurmrestd. Default path is "restd_cert_key.pem" in the Slurm config- uration directory sackd_cert_file= Path of certificate used by sackd. Must chain to ca_cert_file. Should only exist on host running sackd. File permissions must be 600, and owned by SlurmUser. Default path is "sackd_cert.pem" in the Slurm configura- tion directory NOTE: If not using the certmgr plugin, this file needs to exist. sackd_cert_key_file= Path of private key that accompanies sackd_cert_file. Should only exist on host running sackd. File permissions must be 600, and owned by SlurmUser. Default path is "sackd_cert_key.pem" in the Slurm config- uration directory NOTE: If not using the certmgr plugin, this file needs to exist. slurmd_cert_file= Path of certificate used by slurmd. Must chain to ca_cert_file. Should only exist on host running slurmd. File permissions must be 600, and owned by SlurmUser. Default path is "slurmd_cert.pem" in the Slurm configura- tion directory NOTE: If not using the certmgr plugin, this file needs to exist. slurmd_cert_key_file= Path of private key that accompanies slurmd_cert_file. Should only exist on host running slurmd. File permis- sions must be 600, and owned by SlurmUser. Default path is "slurmd_cert_key.pem" in the Slurm con- figuration directory NOTE: If not using the certmgr plugin, this file needs to exist. load_system_certificates Load certificates found in default system locations (e.g. /etc/ssl) into trust store. Default is to not load system certificates, and to rely solely on ca_cert_file to establish trust. security_policy_version= Security policy version used by s2n. See s2n documenta- tion for more details. Default security policy is "20230317", which is FIPS compliant and includes TLS 1.3. TLSType Specify the TLS implementation that will be used. Unset by de- fault. Acceptable values at present: tls/s2n Use the s2n TLS plugin. Requires additional configuration and causes significant processing overhead, but allows all Slurm communication to be encrypted. Refer to the TLS guide for more details: <https://slurm.schedmd.com/tls.html> TmpFS Fully qualified pathname of the file system available to user jobs for temporary storage. This parameter is used in establish- ing a node's TmpDisk space. The default value is "/tmp". TopologyParam Comma-separated options identifying network topology options. Dragonfly Optimize allocation for Dragonfly network. Valid when TopologyPlugin=topology/tree. RoutePart Instead of using the plugin's default route calculation, use partition node lists to route communications from the controller. Once on the compute node, communications will be routed us- ing the requested plugin's normal algorithm, following TreeWidth if applicable. If a node is in multiple partitions, the first partition seen will be used. The controller will communi- cate directly with any nodes that aren't in a partition. BlockAsNodeRank Assign the same node rank to all nodes under one base block. This can be useful if the nam- ing convention for the nodes does not match the network topology. Valid when topology/block is a cluster default topology. SwitchAsNodeRank Assign the same node rank to all nodes under one leaf switch. This can be useful if the naming convention for the nodes does not match the network topology. Valid when topology/tree is a cluster default topology. RouteTree Use the switch hierarchy defined in a topol- ogy.conf file for routing instead of just scheduling. Valid when TopologyPlugin=topol- ogy/tree. Incompatible with dynamic nodes. TopoMaxSizeUnroll=Maximum number of individual job sizes auto- matically unrolled from min-max nodes job specification. Default: -1 (option disabled). Valid when TopologyPlu- gin=topology/block. TopoOptional Only optimize allocation for network topology if the job includes a switch option. Since op- timizing resource allocation for topology in- volves much higher system overhead, this option can be used to impose the extra overhead only on jobs which can take advantage of it. If most job allocations are not optimized for network topology, they may fragment resources to the point that topology optimization for other jobs will be difficult to achieve. NOTE: Jobs may span across nodes without common parent switches with this enabled. TopologyPlugin Identifies the plugin to be used for determining the network topology and optimizing job allocations to minimize network con- tention. See NETWORK TOPOLOGY below for details. Additional plugins may be provided in the future which gather topology in- formation directly from the network. Acceptable values include: topology/block used for a block network topology, as de- scribed in the topology.conf(5) man page topology/flat best-fit logic over one-dimensional topol- ogy. This is the default. topology/tree used for a hierarchical network with the select/cons_tres plugin, as described in the topology.conf(5) man page NOTE: This option is ignored if topology.yaml exists. TrackWCKey Boolean yes or no. Used to set display and track of the Workload Characterization Key. Must be set to track correct wckey usage. NOTE: You must also set TrackWCKey in your slurmdbd.conf file to create historical usage reports. TreeWidth Slurmd daemons use a virtual tree network for communications. TreeWidth specifies the width of the tree (i.e. the fanout). The default value is 16, meaning each slurmd daemon can communi- cate with up to 16 other slurmd daemons. This value balances of- floading slurmctld (max 16 threads running), time of communica- tion, and node fault tolerance (4368 nodes can be contacted with three message hops). The default value will work well for most clusters however on bigger systems this value can be increased to avoid long timeouts and retransmissions in case of unrespon- sive nodes. The value may not exceed 65533. UnkillableStepProgram If the processes in a job step are determined to be unkillable for a period of time specified by the UnkillableStepTimeout variable, the program specified by UnkillableStepProgram will be executed. By default no program is run. See section UNKILLABLE STEP PROGRAM SCRIPT for more information. UnkillableStepTimeout The length of time, in seconds, that Slurm will wait before de- ciding that processes in a job step are unkillable (after they have been signaled with SIGKILL) and execute UnkillableStepPro- gram. The default timeout value is 60 seconds or five times the value of MessageTimeout, whichever is greater. If exceeded, the compute node will be drained to prevent future jobs from being scheduled on the node. NOTE: Ensure that UnkillableStepTimeout is at least 5 times larger than MessageTimeout, otherwise it can lead to unexpected draining of nodes. UrlParserType Specify the url_parser implementation that will be used. Default is url_parser/libhttp_parser. Acceptable values at present: url_parser/libhttp_parser Use the libhttp_parser based plugin. UsePAM If set to 1, PAM (Pluggable Authentication Modules for Linux) will be enabled. PAM is used to establish the upper bounds for resource limits. With PAM support enabled, local system adminis- trators can dynamically configure system resource limits. Chang- ing the upper bound of a resource limit will not alter the lim- its of running jobs, only jobs started after a change has been made will pick up the new limits. The default value is 0 (not to enable PAM support). Remember that PAM also needs to be con- figured to support Slurm as a service. For sites using PAM's directory based configuration option, a configuration file named slurm should be created. The module-type, control-flags, and module-path names that should be included in the file are: auth required pam_localuser.so auth required pam_shells.so account required pam_unix.so account required pam_access.so session required pam_unix.so For sites configuring PAM with a general configuration file, the appropriate lines (see above), where slurm is the service-name, should be added. See <https://slurm.schedmd.com/pam_slurm_adopt.html> for more de- tails. NOTE: UsePAM option has nothing to do with the con- tribs/pam/pam_slurm and/or contribs/pam_slurm_adopt modules. So these two modules can work independently of the value set for UsePAM. VSizeFactor Memory specifications in job requests apply to real memory size (also known as resident set size). It is possible to enforce virtual memory limits for both jobs and job steps by limiting their virtual memory to some percentage of their real memory al- location. The VSizeFactor parameter specifies the job's or job step's virtual memory limit as a percentage of its real memory limit. For example, if a job's real memory limit is 500MB and VSizeFactor is set to 101 then the job will be killed if its real memory exceeds 500MB or its virtual memory exceeds 505MB (101 percent of the real memory limit). The default value is 0, which disables enforcement of virtual memory limits. The value may not exceed 65533 percent. NOTE: This parameter is dependent on OverMemoryKill being con- figured in JobAcctGatherParams. It is also possible to configure the TaskPlugin to use task/cgroup for memory enforcement. VSize- Factor will not have an effect on memory enforcement done through cgroups. WaitTime Specifies how many seconds the srun command should by default wait after the first task terminates before terminating all re- maining tasks. The "--wait" option on the srun command line overrides this value. The default value is 0, which disables this feature. May not exceed 65533 seconds. X11Parameters For use with Slurm's built-in X11 forwarding implementation. home_xauthority If set, xauth data on the compute node will be placed in ~/.Xauthority rather than in a temporary file under TmpFS. NODE CONFIGURATION The configuration of nodes (or machines) to be managed by Slurm is also specified in /etc/slurm.conf. Changes in node configuration (e.g. adding nodes, changing their processor count, etc.) require restarting or reconfiguring all slurmctld and slurmd daemons. All slurmd daemons must know each node in the system to forward messages in support of hi- erarchical communications. Only the NodeName must be supplied in the configuration file. All other node configuration information is op- tional. It is advisable to establish baseline node configurations, es- pecially if the cluster is heterogeneous. Nodes which register to the system with less than the configured resources (e.g. too little mem- ory), will be placed in the "DOWN" state to avoid scheduling jobs on them. Establishing baseline configurations will also speed Slurm's scheduling process by permitting it to compare job requirements against these (relatively few) configuration parameters and possibly avoid hav- ing to check job requirements against every individual node's configu- ration. The resources checked at node registration time are: CPUs, RealMemory and TmpDisk. Default values can be specified with a record in which NodeName is "DE- FAULT". The default entry values will apply only to lines following it in the configuration file and the default values can be reset multiple times in the configuration file with multiple entries where "Node- Name=DEFAULT". Each line where NodeName is "DEFAULT" will replace or add to previous default values and will not reinitialize the default values. The "NodeName=" specification must be placed on every line de- scribing the configuration of nodes. A single node name can not appear as a NodeName value in more than one line (duplicate node name records will be ignored). In fact, it is generally possible and desirable to define the configurations of all nodes in only a few lines. This con- vention permits significant optimization in the scheduling of larger clusters. In order to support the concept of jobs requiring consecu- tive nodes on some architectures, node specifications should be place in this file in consecutive order. No single node name may be listed more than once in the configuration file. Use "DownNodes=" to record the state of nodes which are temporarily in a DOWN, DRAIN or FAILING state without altering permanent configuration information. A job step's tasks are allocated to nodes in order the nodes appear in the configuration file. There is presently no capability within Slurm to arbitrarily order a job step's tasks. Multiple node names may be comma separated (e.g. "alpha,beta,gamma") and/or a simple node range expression may optionally be used to specify numeric ranges of nodes to avoid building a configuration file with large numbers of entries. The node range expression can contain one pair of square brackets with a sequence of comma-separated numbers and/or ranges of numbers separated by a "-" (e.g. "linux[0-64,128]", or "lx[15,18,32-33]"). Note that the numeric ranges can include one or more leading zeros to indicate the numeric portion has a fixed number of digits (e.g. "linux[0000-1023]"). Multiple numeric ranges can be included in the expression (e.g. "rack[0-63]_blade[0-41]"). If one or more numeric expressions are included, one of them must be at the end of the name (e.g. "unit[0-31]rack" is invalid), but arbitrary names can always be used in a comma-separated list. The node configuration specified the following information: NodeName Name that Slurm uses to refer to a node. Typically this would be the string that "/bin/hostname -s" returns. It may also be the fully qualified domain name as returned by "/bin/hostname -f" (e.g. "foo1.bar.com"), or any valid domain name associated with the host through the host database (/etc/hosts) or DNS, de- pending on the resolver settings. Note that if the short form of the hostname is not used, it may prevent use of hostlist expres- sions (the numeric portion in brackets must be at the end of the string). It may also be an arbitrary string if NodeHostname is specified. If the NodeName is "DEFAULT", the values specified with that record will apply to subsequent node specifications unless explicitly set to other values in that node record or re- placed with a different set of default values. Each line where NodeName is "DEFAULT" will replace or add to previous default values and not reinitialize the default values. For architec- tures in which the node order is significant, nodes will be con- sidered consecutive in the order defined. For example, if the configuration for "NodeName=charlie" immediately follows the configuration for "NodeName=baker" they will be considered adja- cent in the computer. NOTE: If the NodeName is "ALL" the process parsing the configuration will exit immediately as it is an internally reserved word. NodeHostname Typically this would be the string that "/bin/hostname -s" re- turns. It may also be the fully qualified domain name as re- turned by "/bin/hostname -f" (e.g. "foo1.bar.com"), or any valid domain name associated with the host through the host database (/etc/hosts) or DNS, depending on the resolver settings. Note that if the short form of the hostname is not used, it may pre- vent use of hostlist expressions (the numeric portion in brack- ets must be at the end of the string). A node range expression can be used to specify a set of nodes. If an expression is used, the number of nodes identified by NodeHostname on a line in the configuration file must be identical to the number of nodes identified by NodeName. By default, the NodeHostname will be identical in value to NodeName. NodeAddr Name that a node should be referred to in establishing a commu- nications path. This name will be used as an argument to the getaddrinfo() function for identification. If a node range ex- pression is used to designate multiple nodes, they must exactly match the entries in the NodeName (e.g. "NodeName=lx[0-7] NodeAddr=elx[0-7]"). NodeAddr may also contain IP addresses. By default, the NodeAddr will be identical in value to NodeHost- name. BcastAddr Alternate network path to be used for sbcast network traffic to a given node. This name will be used as an argument to the getaddrinfo() function. If a node range expression is used to designate multiple nodes, they must exactly match the entries in the NodeName (e.g. "NodeName=lx[0-7] BcastAddr=elx[0-7]"). BcastAddr may also contain IP addresses. By default, the Bcas- tAddr is unset, and sbcast traffic will be routed to the NodeAddr for a given node. Note: cannot be used with Communica- tionParameters=NoInAddrAny. Boards Number of Baseboards in nodes with a baseboard controller. Note that when Boards is specified, SocketsPerBoard, CoresPerSocket, and ThreadsPerCore should be specified. The default value is 1. CoreSpecCount Number of cores reserved for system use. Depending upon the TaskPluginParam option of SlurmdOffSpec, the Slurm daemon slurmd may either be confined to these resources (the default) or pre- vented from using these resources. If cgroup/v1 is used, the same applies to the slurmstepd processes. Isolation of slurmd from user jobs may improve application performance. A job can use these cores if AllowSpecResourcesUsage=yes and the user ex- plicitly requests less than the configured CoreSpecCount. If this option and CpuSpecList are both designated for a node, an error is generated. For information on the algorithm used by Slurm to select the cores refer to the core specialization docu- mentation ( https://slurm.schedmd.com/core_spec.html ). CoresPerSocket Number of cores in a single physical processor socket (e.g. "2"). The CoresPerSocket value describes physical cores, not the logical number of processors per socket. NOTE: If you have multi-core processors, you will likely need to specify this pa- rameter in order to optimize scheduling. The default value is 1. CpuBind If a job step request does not specify an option to control how tasks are bound to allocated CPUs (by using --cpu-bind) and all nodes allocated to the job have the same CpuBind option, the node CpuBind option will control how tasks are bound to allo- cated resources. Partition definitions are used next if the node definition(s) can't be used, followed by TaskPluginParam as a last resort, with the default being no binding. Supported values for CpuBind are none, socket, ldom (NUMA), core and thread. CPUs Number of logical processors on the node (e.g. "2"). It can be set to the total number of sockets(supported only by select/lin- ear), cores or threads. This can be useful when you want to schedule only the cores on a hyper-threaded node. If CPUs is omitted, its default will be set equal to the product of Boards, Sockets, CoresPerSocket, and ThreadsPerCore. CpuSpecList A comma-delimited list of Slurm abstract CPU IDs reserved for system use. The list will be expanded to include all other CPUs, if any, on the same cores. Depending upon the TaskPlugin- Param option of SlurmdOffSpec, the Slurm daemon slurmd may ei- ther be confined to these resources (the default) or prevented from using these resources. If cgroup/v1 is used, the same ap- plies to the slurmstepd processes. Isolation of slurmd from user jobs may improve application performance. A job can use these cores if AllowSpecResourcesUsage=yes and the user explic- itly requests less than the number of CPUs in this list. If this option and CoreSpecCount are both designated for a node, an error is generated. This option has no effect unless cgroup job confinement is also configured (i.e. the task/cgroup TaskPlugin is enabled and ConstrainCores=yes is set in cgroup.conf). Features A comma-delimited list of arbitrary strings indicative of some characteristic associated with the node. There is no value or count associated with a feature at this time, a node either has a feature or it does not. A desired feature may contain a nu- meric component indicating, for example, processor speed but this numeric component will be considered to be part of the fea- ture string. Features are intended to be used to filter nodes eligible to run jobs via the --constraint argument. By default a node has no features. Also see Gres for being able to have more control such as types and count. Using features is faster than scheduling against GRES but is limited to Boolean opera- tions. NOTE: The hostlist function feature{myfeature} expands to all nodes with the specified feature. This may be used in place of or alongside regular hostlist expressions in commands or config- uration files that interact with the slurmctld. For example: scontrol update node=feature{myfeature} state=resume or Parti- tionName=p1 Nodes=feature{myfeature}. Gres A comma-delimited list of generic resources specifications for a node. The format is: "<name>[:<type>][:no_consume]:<num- ber>[K|M|G]". The first field is the resource name, which matches the GresType configuration parameter name. The optional type field might be used to identify a model of that generic re- source. It is forbidden to specify both an untyped GRES and a typed GRES with the same <name>. The optional no_consume field allows you to specify that a generic resource does not have a finite number of that resource that gets consumed as it is re- quested. The no_consume field is a GRES specific setting and ap- plies to the GRES, regardless of the type specified. It should not be used with GRES that has a dedicated plugin, if you're looking for a way to overcommit GPUs to multiple processes at the time you may be interested in using "shard" GRES instead. The final field must specify a generic resources count. A suf- fix of "K", "M", "G", "T" or "P" may be used to multiply the number by 1024, 1048576, 1073741824, etc. respectively. (e.g."Gres=gpu:tesla:1,gpu:kepler:1,bandwidth:lustre:no_con- sume:4G"). By default a node has no generic resources and its maximum count is that of an unsigned 64bit integer. Also see Features for Boolean flags to filter nodes using job con- straints. MemSpecLimit Amount of RealMemory, in megabytes, reserved for system use and not available for user allocations. Must be less than the amount defined for RealMemory. If the task/cgroup plugin is configured and that plugin constrains memory allocations (i.e. the task/cgroup TaskPlugin is enabled and ConstrainRAMSpace=yes is set in cgroup.conf), then the slurmd will be allocated the spec- ified memory limit. If cgroup/v1 is used the slurmstepd will also be allocated the specified memory limit. If cgroup/v2 is used, the slurmstepd's consumption is completely dependent on the topology of the job. Note that having the Memory set in Se- lectTypeParameters as any of the options that has it as a con- sumable resource is needed for this option to work. The daemons will not be killed if they exhaust the memory allocation (i.e. the Out-Of-Memory Killer is disabled for the daemon's memory cgroup). If the task/cgroup plugin is not configured, the spec- ified memory will only be unavailable for user allocations. Parameters Allows for node-specific additions to the global SlurmdParame- ters. Options are appended, and cannot override global options. Port The port number that the Slurm compute node daemon, slurmd, lis- tens to for work on this particular node. By default there is a single port number for all slurmd daemons on all compute nodes as defined by the SlurmdPort configuration parameter. Use of this option is not generally recommended except for development or testing purposes. If multiple slurmd daemons execute on a node this can specify a range of ports. NOTE: On Cray systems, Realm-Specific IP Addressing (RSIP) will automatically try to interact with anything opened on ports 8192-60000. Configure Port to use a port outside of the config- ured SrunPortRange and RSIP's port range. Procs See CPUs. RealMemory Size of real memory on the node in megabytes (e.g. "2048"). The default value is 1. Lowering RealMemory with the goal of setting aside some amount for the OS and not available for job alloca- tions will not work as intended if Memory is not set as a con- sumable resource in SelectTypeParameters. So one of the *_Memory options need to be enabled for that goal to be accomplished. Also see MemSpecLimit. Reason Identifies the reason for a node being in state "DOWN", "DRAINED" "DRAINING", "FAIL" or "FAILING". Use quotes to en- close a reason having more than one word. RestrictedCoresPerGPU Number of cores per GPU restricted for only GPU use. If a job does not request a GPU it will not have access to these cores. The node's GPUs must either be autodetected or have valid cores configured in gres.conf(5). NOTE: Configuring multiple GPU types on overlapping sockets can result in erroneous GPU type and restricted core pairings in al- locations requesting gpus without specifying a type. NOTE: Shared gpu gres (shards or mps) will have access to these cores, but there is no guarantee that reserved cores are used in pro- portion to the shared gres allocation. Sockets Number of physical processor sockets/chips on the node (e.g. "2"). If Sockets is omitted, it will be inferred from CPUs, CoresPerSocket, and ThreadsPerCore. NOTE: If you have multi-core processors, you will likely need to specify these pa- rameters. Sockets and SocketsPerBoard are mutually exclusive. If Sockets is specified when Boards is also used, Sockets is in- terpreted as SocketsPerBoard rather than total sockets. The de- fault value is 1. SocketsPerBoard Number of physical processor sockets/chips on a baseboard. Sockets and SocketsPerBoard are mutually exclusive. The default value is 1. State State of the node with respect to the initiation of user jobs. Acceptable values are CLOUD, DOWN, DRAIN, FAIL, FAILING, FUTURE and UNKNOWN. Node states of BUSY and IDLE should not be speci- fied in the node configuration, but set the node state to UN- KNOWN instead. Setting the node state to UNKNOWN will result in the node state being set to BUSY, IDLE or other appropriate state based upon recovered system state information. The de- fault value is UNKNOWN. Also see the DownNodes parameter below. CLOUD Indicates the node exists in the cloud. Its initial state will be treated as powered down. The node will be available for use after its state is recovered from Slurm's state save file or the slurmd daemon starts on the compute node. DOWN Indicates the node failed and is unavailable to be al- located work. DRAIN Indicates the node is unavailable to be allocated work. FAIL Indicates the node is expected to fail soon, has no jobs allocated to it, and will not be allocated to any new jobs. FAILING Indicates the node is expected to fail soon, has one or more jobs allocated to it, but will not be allo- cated to any new jobs. FUTURE Indicates the node is defined for future use and need not exist when the Slurm daemons are started. These nodes can be made available for use simply by updating the node state using the scontrol command rather than restarting the slurmctld daemon. After these nodes are made available, change their State in the slurm.conf file. Until these nodes are made available, they will not be seen using any Slurm commands or nor will any attempt be made to contact them. FUTURE nodes retain non-FUTURE state on restart. Use scontrol to put node back into FUTURE state. Dynamic Future Nodes A slurmd started with -F[<feature>] will be as- sociated with a FUTURE node that matches the same configuration (sockets, cores, threads) as reported by slurmd -C. The node's NodeAddr and NodeHostname will automatically be retrieved from the slurmd and will be cleared when set back to the FUTURE state. UNKNOWN Indicates the node's state is undefined but will be established (set to BUSY or IDLE) when the slurmd dae- mon on that node registers. UNKNOWN is the default state. ThreadsPerCore Number of logical threads in a single physical core (e.g. "2"). Note that the Slurm can allocate resources to jobs down to the resolution of a core. If your system is configured with more than one thread per core, execution of a different job on each thread is not supported unless you configure SelectTypeParame- ters=CR_CPU plus CPUs; do not configure Sockets, CoresPerSocket or ThreadsPerCore. A job can execute a one task per thread from within one job step or execute a distinct job step on each of the threads. Note also if you are running with more than 1 thread per core and running the select/cons_tres plugin then you will want to set the SelectTypeParameters variable to something other than CR_CPU to avoid unexpected results. The default value is 1. TmpDisk Total size of temporary disk storage in TmpFS in megabytes (e.g. "16384"). TmpFS (for "Temporary File System") identifies the lo- cation which jobs should use for temporary storage. Note this does not indicate the amount of free space available to the user on the node, only the total file system size. The system admin- istration should ensure this file system is purged as needed so that user jobs have access to most of this space. The Prolog and/or Epilog programs (specified in the configuration file) might be used to ensure the file system is kept clean. The de- fault value is 0. Topology Comma-separated list of pairs in the format <topol- ogy_name>:<topology_unit>. Where <topology_unit> is the block name or the name of a leaf switch. Intermediate switch names -- ':' delimited -- can be provided and will be created if needed (e.g. Topology=topo-tree:sw_root:s1:s2). This setting over- writes the node topology affiliation configuration specified in topology.conf(5) and topology.yaml(5). Weight The priority of the node for scheduling purposes. All things being equal, jobs will be allocated the nodes with the lowest weight which satisfies their requirements. For example, a het- erogeneous collection of nodes might be placed into a single partition for greater system utilization, responsiveness and ca- pability. It would be preferable to allocate smaller memory nodes rather than larger memory nodes if either will satisfy a job's requirements. The units of weight are arbitrary, but larger weights should be assigned to nodes with more processors, memory, disk space, higher processor speed, etc. Note that if a job allocation request can not be satisfied using the nodes with the lowest weight, the set of nodes with the next lowest weight is added to the set of nodes under consideration for use (repeat as needed for higher weight values). If you absolutely want to minimize the number of higher weight nodes allocated to a job (at a cost of higher scheduling overhead), give each node a dis- tinct Weight value and they will be added to the pool of nodes being considered for scheduling individually. The default value is 1. NOTE: Node weights are first considered among currently avail- able nodes. For example, POWERED_DOWN and POWERING_UP nodes with lower weights will not be evaluated before a powered up IDLE node. DOWN NODE CONFIGURATION The DownNodes= parameter permits you to mark certain nodes as in a DOWN, DRAIN, FAIL, FAILING or FUTURE state without altering the perma- nent configuration information listed under a NodeName= specification. DownNodes Any node name, or list of node names, from the NodeName= speci- fications. Reason Identifies the reason for a node being in state DOWN, DRAIN, FAIL, FAILING or FUTURE. Use quotes to enclose a reason having more than one word. State State of the node with respect to the initiation of user jobs. Acceptable values are DOWN, DRAIN, FAIL, FAILING and FUTURE. For more information about these states see the descriptions un- der State in the NodeName= section above. The default value is DOWN. NODESET CONFIGURATION The nodeset configuration allows you to define a name for a specific set of nodes which can be used to simplify the partition configuration section, especially for heterogeneous or condo-style systems. Each nodeset may be defined by an explicit list of nodes, and/or by filter- ing the nodes by a particular configured feature. If both Feature= and Nodes= are used the nodeset shall be the union of the two subsets. Note that the nodesets are only used to simplify the partition defini- tions at present, and are not usable outside of the partition configu- ration. Feature All nodes with this feature will be included as part of this nodeset. Only a single feature is allowed. Nodes List of nodes in this set. NodeSet Unique name for a set of nodes. Must not overlap with any Node- Name definitions. PARTITION CONFIGURATION The partition configuration permits you to establish different job lim- its or access controls for various groups (or partitions) of nodes. Nodes may be in more than one partition, making partitions serve as general purpose queues. For example one may put the same set of nodes into two different partitions, each with different constraints (time limit, job sizes, groups allowed to use the partition, etc.). Jobs are allocated resources within a single partition. Default values can be specified with a record in which PartitionName is "DEFAULT". The de- fault entry values will apply only to lines following it in the config- uration file and the default values can be reset multiple times in the configuration file with multiple entries where "PartitionName=DEFAULT". The "PartitionName=" specification must be placed on every line de- scribing the configuration of partitions. Each line where Partition- Name is "DEFAULT" will replace or add to previous default values and not reinitialize the default values. A single partition name can not appear as a PartitionName value in more than one line (duplicate parti- tion name records will be ignored). If a partition that is in use is deleted from the configuration and slurm is restarted or reconfigured (scontrol reconfigure), jobs using the partition are canceled. NOTE: Put all parameters for each partition on a single line. Each line of partition configuration information should represent a different parti- tion. The partition configuration file contains the following informa- tion: AllocNodes Comma-separated list of nodes from which users can submit jobs in the partition. Node names may be specified using the node range expression syntax described above. The default value is "ALL". AllowAccounts Comma-separated list of accounts which may execute jobs in the partition. The default value is "ALL". This list is hierarchi- cal, meaning subaccounts are included automatically. NOTE: If AllowAccounts is used then DenyAccounts will not be enforced. Also refer to DenyAccounts. AllowGroups Comma-separated list of group names which may execute jobs in this partition. A user will be permitted to submit a job to this partition if AllowGroups has at least one group associated with the user. Jobs executed as user root or as user SlurmUser will be allowed to use any partition, regardless of the value of AllowGroups. In addition, a Slurm Admin or Operator will be able to view any partition, regardless of the value of AllowGroups. If user root attempts to execute a job as another user (e.g. us- ing srun's --uid option), then the job will be subject to Allow- Groups as if it were submitted by that user. By default, Allow- Groups is unset, meaning all groups are allowed to use this par- tition. The special value 'ALL' is equivalent to this. Users who are not members of the specified group will not see informa- tion about this partition by default. However, this should not be treated as a security mechanism, since job information will be returned if a user requests details about the partition or a specific job. See the PrivateData parameter to restrict access to job information. NOTE: For performance reasons, Slurm main- tains a list of user IDs allowed to use each partition and this is checked at job submission time. This list of user IDs is up- dated when the slurmctld daemon is restarted, reconfigured (e.g. "scontrol reconfig") or the partition's AllowGroups value is re- set, even if is value is unchanged (e.g. "scontrol update Parti- tionName=name AllowGroups=group"). For a user's access to a partition to change, both his group membership must change and Slurm's internal user ID list must change using one of the meth- ods described above. AllowQos Comma-separated list of Qos which may execute jobs in the parti- tion. Jobs executed as user root can use any partition without regard to the value of AllowQos. The default value is "ALL". NOTE: If AllowQos is used then DenyQos will not be enforced. Also refer to DenyQos. Alternate Partition name of alternate partition to be used if the state of this partition is "DRAIN" or "INACTIVE." CpuBind If a job step request does not specify an option to control how tasks are bound to allocated CPUs (by using --cpu-bind) and all nodes allocated to the job do not have the same CpuBind option for the node, then the partition's CpuBind option will control how tasks are bound to allocated resources. The TaskPluginParam will be used as a last resort, with the default being no bind- ing. Supported values for CpuBind are none, socket, ldom (NUMA), core and thread. Default If this keyword is set, jobs submitted without a partition spec- ification will utilize this partition. Possible values are "YES" and "NO". The default value is "NO". DefaultTime Run time limit used for jobs that don't specify a value. If not set then MaxTime will be used. Format is the same as for Max- Time. DefCpuPerGPU Default count of CPUs allocated per allocated GPU. This value is used only if the job didn't specify --cpus-per-task and --cpus-per-gpu. DefMemPerCPU Default real memory size available per allocated CPU in megabytes. Used to avoid over-subscribing memory and causing paging. DefMemPerCPU would generally be used if individual processors are allocated to jobs (SelectType=select/cons_tres). If not set, the DefMemPerCPU value for the entire cluster will be used. Also see DefMemPerGPU, DefMemPerNode and MaxMemPerCPU. DefMemPerCPU, DefMemPerGPU and DefMemPerNode are mutually exclu- sive. DefMemPerGPU Default real memory size available per allocated GPU in megabytes. Please note a best effort attempt is made to predict which GPUs on the system will be used, but this could change be- tween job submission and start time, causing MaxMemPerNode to potentially not work as expected for heterogeneous jobs. Also see DefMemPerCPU, DefMemPerNode and MaxMemPerCPU. DefMemPerCPU, DefMemPerGPU and DefMemPerNode are mutually exclusive. DefMemPerNode Default real memory size available per allocated node in megabytes. Used to avoid over-subscribing memory and causing paging. DefMemPerNode would generally be used if whole nodes are allocated to jobs (SelectType=select/linear) and resources are over-subscribed (OverSubscribe=yes or OverSubscribe=force). If not set, the DefMemPerNode value for the entire cluster will be used. Also see DefMemPerCPU, DefMemPerGPU and MaxMemPerCPU. DefMemPerCPU, DefMemPerGPU and DefMemPerNode are mutually exclu- sive. DenyAccounts Comma-separated list of accounts which may not execute jobs in the partition. By default, no accounts are denied access. This list is hierarchical, meaning subaccounts are included automati- cally. NOTE: If AllowAccounts is used then DenyAccounts will not be enforced. Also refer to AllowAccounts. DenyQos Comma-separated list of Qos which may not execute jobs in the partition. By default, no QOS are denied access NOTE: If Al- lowQos is used then DenyQos will not be enforced. Also refer AllowQos. DisableRootJobs If set to "YES" then user root will be prevented from running any jobs on this partition. The default value will be the value of DisableRootJobs set outside of a partition specification (which is "NO", allowing user root to execute jobs). ExclusiveTopo If set to "YES," then only one job may be run on a single topol- ogy segment. This capability is also available on a per-job ba- sis by using the --exclusive=topo option. ExclusiveUser If set to "YES" then nodes will be exclusively allocated to users. Multiple jobs may be run for the same user, but only one user can be active at a time. This capability is also available on a per-job basis by using the --exclusive=user option. GraceTime Specifies, in units of seconds, the preemption grace time to be extended to a job which has been selected for preemption. This parameter only takes effect when PreemptType=partition_prio. The default value is zero, no preemption grace time is allowed on this partition. Once a job has been selected for preemption, its end time is set to the current time plus GraceTime. The job's tasks are immediately sent SIGCONT and SIGTERM signals in order to provide notification of its imminent termination. This is followed by the SIGCONT, SIGTERM and SIGKILL signal sequence upon reaching its new end time. This second set of signals is sent to both the tasks and the containing batch script, if ap- plicable. See also the global KillWait configuration parameter. NOTE: This parameter does not apply to PreemptMode=SUSPEND. For setting the preemption grace time when using PreemptMode=SUS- PEND, see PreemptParameters=suspend_grace_time. Hidden Specifies if the partition and its jobs are to be hidden by de- fault. Hidden partitions will by default not be reported by the Slurm APIs or commands. Possible values are "YES" and "NO". The default value is "NO". Note that partitions that a user lacks access to by virtue of the AllowGroups parameter will also be hidden by default. LLN Schedule resources to jobs on the least loaded nodes (based upon the number of idle CPUs). This is generally only recommended for an environment with serial jobs as idle resources will tend to be highly fragmented, resulting in parallel jobs being distrib- uted across many nodes. Note that node Weight takes precedence over how many idle resources are on each node. Also see the Se- lectTypeParameters configuration parameter CR_LLN to use the least loaded nodes in every partition. MaxCPUsPerNode Maximum number of CPUs on any node available to all jobs from this partition. This can be especially useful to schedule GPUs. For example a node can be associated with two Slurm partitions (e.g. "cpu" and "gpu") and the partition/queue "cpu" could be limited to only a subset of the node's CPUs, ensuring that one or more CPUs would be available to jobs in the "gpu" parti- tion/queue. Also see MaxCPUsPerSocket. MaxCPUsPerSocket Maximum number of CPUs on any node available on the all jobs from this partition. This can be especially useful to schedule GPUs. Also see MaxCPUsPerNode. MaxMemPerCPU Maximum real memory size available per allocated CPU in megabytes. Used to avoid over-subscribing memory and causing paging. MaxMemPerCPU would generally be used if individual processors are allocated to jobs (SelectType=select/cons_tres). If not set, the MaxMemPerCPU value for the entire cluster will be used. Also see DefMemPerCPU and MaxMemPerNode. MaxMemPerCPU and MaxMemPerNode are mutually exclusive. MaxMemPerNode Maximum real memory size available per allocated node in a job allocation in megabytes. Used to avoid over-subscribing memory and causing paging. MaxMemPerNode would generally be used if whole nodes are allocated to jobs (SelectType=select/linear) and resources are over-subscribed (OverSubscribe=yes or OverSub- scribe=force). If not set, the MaxMemPerNode value for the en- tire cluster will be used. Also see DefMemPerNode and MaxMem- PerCPU. MaxMemPerCPU and MaxMemPerNode are mutually exclusive. MaxNodes Maximum count of nodes which may be allocated to any single job. The default value is "UNLIMITED", which is represented inter- nally as -1. MaxTime Maximum run time limit for jobs. Format is minutes, min- utes:seconds, hours:minutes:seconds, days-hours, days-hours:min- utes, days-hours:minutes:seconds or "UNLIMITED". Time resolu- tion is one minute and second values are rounded up to the next minute. The job TimeLimit may be updated by root, SlurmUser or an Operator to a value higher than the configured MaxTime after job submission. MinNodes Minimum count of nodes which may be allocated to any single job. The default value is 0. Nodes Comma-separated list of nodes or nodesets which are associated with this partition. Node names may be specified using the node range expression syntax described above. A blank list of nodes (i.e. Nodes="") can be used if one wants a partition to exist, but have no resources (possibly on a temporary basis). A value of "ALL" is mapped to all nodes configured in the cluster. OverSubscribe Controls the ability of the partition to execute more than one job at a time on each resource (node, socket or core depending upon the value of SelectTypeParameters). If resources are to be over-subscribed, avoiding memory over-subscription is very im- portant. SelectTypeParameters should be configured to treat memory as a consumable resource and the --mem option should be used for job allocations. Sharing of resources is typically useful only when using gang scheduling (PreemptMode=sus- pend,gang). Possible values for OverSubscribe are "EXCLUSIVE", "FORCE", "YES", and "NO". Note that a value of "YES" or "FORCE" can negatively impact performance for systems with many thou- sands of running jobs. The default value is "NO". For more in- formation see the following web pages: https://slurm.schedmd.com/cons_tres.html https://slurm.schedmd.com/cons_tres_share.html https://slurm.schedmd.com/gang_scheduling.html https://slurm.schedmd.com/preempt.html EXCLUSIVE Allocates entire nodes to jobs even with Select- Type=select/cons_tres configured. Jobs that run in partitions with OverSubscribe=EXCLUSIVE will have exclusive access to all allocated nodes. These jobs are allocated all CPUs and GRES on the nodes, but they are only allocated as much memory as they ask for. This is by design to support gang scheduling, because suspended jobs still reside in memory. To request all the memory on a node, use --mem=0 at submit time. FORCE Makes all resources (except GRES) in the partition available for oversubscription without any means for users to disable it. May be followed with a colon and maximum number of jobs in running or suspended state. For example OverSubscribe=FORCE:4 enables each node, socket or core to oversubscribe each re- source four ways. Recommended only for systems us- ing PreemptMode=suspend,gang. NOTE: OverSubscribe=FORCE:1 is a special case that is not exactly equivalent to OverSubscribe=NO. Over- Subscribe=FORCE:1 disables the regular oversubscrip- tion of resources in the same partition but it will still allow oversubscription due to preemption or on overlapping partitions with the same PriorityTier. Setting OverSubscribe=NO will prevent oversubscrip- tion from happening in all cases. NOTE: If using PreemptType=preempt/qos you can spec- ify a value for FORCE that is greater than 1. For example, OverSubscribe=FORCE:2 will permit two jobs per resource normally, but a third job can be started only if done so through preemption based upon QOS. NOTE: If OverSubscribe is configured to FORCE or YES in your slurm.conf and the system is not configured to use preemption (PreemptMode=OFF) accounting can easily grow to values greater than the actual uti- lization. It may be common on such systems to get error messages in the slurmdbd log stating: "We have more allocated time than is possible." YES Makes all resources (except GRES) in the partition available for sharing upon request by the job. Re- sources will only be over-subscribed when explicitly requested by the user using the "--oversubscribe" option on job submission. May be followed with a colon and maximum number of jobs in running or sus- pended state. For example "OverSubscribe=YES:4" en- ables each node, socket or core to execute up to four jobs at once. Recommended only for systems running with gang scheduling (PreemptMode=sus- pend,gang). NO Selected resources are allocated to a single job. No resource will be allocated to more than one job. NOTE: Even if you are using PreemptMode=sus- pend,gang, setting OverSubscribe=NO will disable preemption on that partition. Use OverSub- scribe=FORCE:1 if you want to disable normal over- subscription but still allow suspension due to pre- emption. OverTimeLimit Number of minutes by which a job can exceed its time limit be- fore being canceled. Normally a job's time limit is treated as a hard limit and the job will be killed upon reaching that limit. Configuring OverTimeLimit will result in the job's time limit being treated like a soft limit. Adding the OverTimeLimit value to the soft time limit provides a hard time limit, at which point the job is canceled. This is particularly useful for backfill scheduling, which bases upon each job's soft time limit. If not set, the OverTimeLimit value for the entire clus- ter will be used. May not exceed 65533 minutes. A value of "UNLIMITED" is also supported. PartitionName Name by which the partition may be referenced (e.g. "Interac- tive"). This name can be specified by users when submitting jobs. If the PartitionName is "DEFAULT", the values specified with that record will apply to subsequent partition specifica- tions unless explicitly set to other values in that partition record or replaced with a different set of default values. Each line where PartitionName is "DEFAULT" will replace or add to previous default values and not reinitialize the default values. PowerDownOnIdle If set to "YES" and power saving is enabled for the partition, then nodes allocated from this partition will be requested to power down after being allocated at least one job. These nodes will not power down until they transition from COMPLETING to IDLE. If set to "NO" then power saving will operate as config- ured for the partition. The default value is "NO". See <https://slurm.schedmd.com/power_save.html> and <https://slurm.schedmd.com/elastic_computing.html> for more de- tails. NOTE: The following will cause a transition from COMPLETING to IDLE: Completing all running jobs without additional jobs being allo- cated. ExclusiveUser=YES and after all running jobs complete but before another user's job is allocated. OverSubscribe=EXCLUSIVE and after the running job completes but before another job is allocated. NOTE: Nodes are still subject to powering down when being IDLE for SuspendTime when PowerDownOnIdle is set to NO.</p> Also see SuspendTime. PreemptMode Mechanism used to preempt jobs or enable gang scheduling for this partition when PreemptType=preempt/partition_prio is con- figured. This partition-specific PreemptMode configuration pa- rameter will override the cluster-wide PreemptMode for this par- tition. It can be set to OFF to disable preemption and gang scheduling for this partition. See also PriorityTier and the above description of the cluster-wide PreemptMode parameter for further details. The GANG option is used to enable gang scheduling independent of whether preemption is enabled (i.e. independent of the Preempt- Type setting). It can be specified in addition to a PreemptMode setting with the two options comma separated (e.g. Preempt- Mode=SUSPEND,GANG). See <https://slurm.schedmd.com/preempt.html> and <https://slurm.schedmd.com/gang_scheduling.html> for more de- tails. NOTE: For performance reasons, the backfill scheduler reserves whole nodes for jobs, not partial nodes. If during backfill scheduling a job preempts one or more other jobs, the whole nodes for those preempted jobs are reserved for the preemptor job, even if the preemptor job requested fewer resources than that. These reserved nodes aren't available to other jobs dur- ing that backfill cycle, even if the other jobs could fit on the nodes. Therefore, jobs may preempt more resources during a sin- gle backfill iteration than they requested. NOTE: For heterogeneous job to be considered for preemption all components must be eligible for preemption. When a heterogeneous job is to be preempted the first identified component of the job with the highest order PreemptMode (SUSPEND (highest), REQUEUE, CANCEL (lowest)) will be used to set the PreemptMode for all components. The GraceTime and user warning signal for each com- ponent of the heterogeneous job remain unique. Heterogeneous jobs are excluded from GANG scheduling operations. OFF Disables job preemption and gang scheduling. CANCEL The preempted job will be cancelled. GANG Enables gang scheduling (time slicing) of jobs in the same partition, and allows the resuming of sus- pended jobs. NOTE: Gang scheduling is performed independently for each partition, so if you only want time-slicing by OverSubscribe, without any preemption, then config- uring partitions with overlapping nodes is not rec- ommended. On the other hand, if you want to use PreemptType=preempt/partition_prio to allow jobs from higher PriorityTier partitions to Suspend jobs from lower PriorityTier partitions you will need overlapping partitions, and PreemptMode=SUSPEND,GANG to use the Gang scheduler to resume the suspended jobs(s). In any case, time-slicing won't happen be- tween jobs on different partitions. NOTE: Heterogeneous jobs are excluded from GANG scheduling operations. REQUEUE Preempts jobs by requeuing them (if possible) or canceling them. For jobs to be requeued they must have the --requeue sbatch option set or the cluster wide JobRequeue parameter in slurm.conf must be set to 1. SUSPEND The preempted jobs will be suspended, and later the Gang scheduler will resume them. Therefore the SUS- PEND preemption mode always needs the GANG option to be specified at the cluster level. Also, because the suspended jobs will still use memory on the allo- cated nodes, Slurm needs to be able to track memory resources to be able to suspend jobs. If the preemptees and preemptor are on different partitions then the preempted jobs will remain sus- pended until the preemptor ends. NOTE: Because gang scheduling is performed indepen- dently for each partition, if using PreemptType=pre- empt/partition_prio then jobs in higher PriorityTier partitions will suspend jobs in lower PriorityTier partitions to run on the released resources. Only when the preemptor job ends will the suspended jobs will be resumed by the Gang scheduler. NOTE: Suspended jobs will not release GRES. Higher priority jobs will not be able to preempt to gain access to GRES. PriorityJobFactor Partition factor used by priority/multifactor plugin in calcu- lating job priority. Defaults to 1. A value of 0 prevents this partition from adding to the job's priority. The value may not exceed 65533. Also see PriorityTier. PriorityTier Jobs submitted to a partition with a higher PriorityTier value will be evaluated by the scheduler before pending jobs in a par- tition with a lower PriorityTier value. They will also be con- sidered for preemption of running jobs in partition(s) with lower PriorityTier values if PreemptType=preempt/partition_prio. The value may not exceed 65533. Also see PriorityJobFactor. QOS Used to extend the limits available to a QOS on a partition. Jobs will not be associated to this QOS outside of being associ- ated to the partition. They will still be associated to their requested QOS. By default, no QOS is used. Additional details are in the QOS documentation at <https://slurm.schedmd.com/qos.html>, including special condi- tions when a relative QOS is used for this parameter. NOTE: If a limit is set in both the Partition's QOS and the Job's QOS, the Partition QOS limit will be honored unless the Job's QOS has the OverPartQOS flag set, in which case the Job's QOS limit will take precedence. ReqResv Specifies users of this partition are required to designate a reservation when submitting a job. This option can be useful in restricting usage of a partition that may have higher priority or additional resources to be allowed only within a reservation. Possible values are "YES" and "NO". The default value is "NO". ResumeTimeout Maximum time permitted (in seconds) between when a node resume request is issued and when the node is actually available for use. Nodes which fail to respond in this time frame will be marked DOWN and the jobs scheduled on the node requeued if pos- sible. Nodes which reboot after this time frame will be marked DOWN with a reason of "Node unexpectedly rebooted." For nodes that are in multiple partitions with this option set, the high- est time will take effect. If not set on any partition, the node will use the ResumeTimeout value set for the entire cluster. The maximum value is either 65533 or INFINITE. RootOnly Specifies if only user ID zero (i.e. user root) may allocate re- sources in this partition. User root may allocate resources for any other user, but the request must be initiated by user root. This option can be useful for a partition to be managed by some external entity (e.g. a higher-level job manager) and prevents users from directly using those resources. Possible values are "YES" and "NO". The default value is "NO". SelectTypeParameters Partition-specific resource allocation type. This option re- places the global SelectTypeParameters value. Supported values are CR_Core, CR_Core_Memory, CR_Socket and CR_Socket_Memory. Use requires the system-wide SelectTypeParameters value be set to any of the four supported values previously listed; other- wise, the partition-specific value will be ignored. Shared The Shared configuration parameter has been replaced by the OverSubscribe parameter described above. State State of partition or availability for use. Possible values are "UP", "DOWN", "DRAIN" and "INACTIVE". The default value is "UP". See also the related "Alternate" keyword. UP Designates that new jobs may be queued on the parti- tion, and that jobs may be allocated nodes and run from the partition. DOWN Designates that new jobs may be queued on the parti- tion, but queued jobs may not be allocated nodes and run from the partition. Jobs already running on the partition continue to run. The jobs must be explicitly canceled to force their termination. DRAIN Designates that no new jobs may be queued on the par- tition (job submission requests will be denied with an error message), but jobs already queued on the parti- tion may be allocated nodes and run. See also the "Alternate" partition specification. INACTIVE Designates that no new jobs may be queued on the par- tition, and jobs already queued may not be allocated nodes and run. See also the "Alternate" partition specification. SuspendTime Nodes which remain idle or down for this number of seconds will be placed into power save mode by SuspendProgram. For nodes that are in multiple partitions with this option set, the high- est time will take effect. If not set on any partition, the node will use the SuspendTime value set for the entire cluster. Set- ting SuspendTime to INFINITE will disable suspending of nodes in this partition. Setting SuspendTime to anything but INFINITE (or -1) will enable power save mode. SuspendTimeout Maximum time permitted (in seconds) between when a node suspend request is issued and when the node is shutdown. At that time the node must be ready for a resume request to be issued as needed for new work. For nodes that are in multiple partitions with this option set, the highest time will take effect. If not set on any partition, the node will use the SuspendTimeout value set for the entire cluster. Topology Name of the topology, defined in topology.yaml, used by jobs in this partition. TRESBillingWeights TRESBillingWeights is used to define the billing weights of each tracked TRES type (see AccountingStorageTRES) that will be used in calculating the usage of a job. The calculated usage is used when calculating fairshare and when enforcing the TRES billing limit on jobs. Billing weights are specified as a comma-separated list of <TRES Type>=<TRES Billing Weight> pairs. Any TRES Type is available for billing. Note that the base unit for memory and burst buffers is megabytes. By default the billing of TRES is calculated as the sum of all TRES types multiplied by their corresponding billing weight. The weighted amount of a resource can be adjusted by adding a suffix of K,M,G,T or P after the billing weight. For example, a memory weight of "mem=.25" on a job allocated 8GB will be billed 2048 (8192MB *.25) units. A memory weight of "mem=.25G" on the same job will be billed 2 (8192MB * (.25/1024)) units. Negative values are allowed. When a job is allocated 1 CPU and 8 GB of memory on a partition configured with TRESBilling- Weights="CPU=1.0,Mem=0.25G,GRES/gpu=2.0,license/licA=1.5", the billable TRES will be: (1*1.0) + (8*0.25) + (0*2.0) + (0*1.5) = 3.0. If PriorityFlags=MAX_TRES is configured, the billable TRES is calculated as the MAX of individual TRESs on a node (e.g. cpus, mem, gres) plus the sum of all global TRESs (e.g. licenses). Us- ing the same example above the billable TRES will be MAX(1*1.0, 8*0.25, 0*2.0) + (0*1.5) = 2.0. If TRESBillingWeights is not defined then the job is billed against the total number of allocated CPUs. NOTE: TRESBillingWeights doesn't affect job priority directly as it is currently not used for the size of the job. If you want TRESs to play a role in the job's priority then refer to the PriorityWeightTRES option. PROLOG AND EPILOG SCRIPTS There are a variety of prolog and epilog program options that execute with various permissions and at various times. The four options most likely to be used are: Prolog and Epilog (executed once on each compute node for each job) plus PrologSlurmctld and EpilogSlurmctld (executed once on the SlurmctldHost for each job). NOTE: Standard output and error messages are normally not preserved. Explicitly write output and error messages to an appropriate location if you wish to preserve that information. NOTE: By default the Prolog script is ONLY run on any individual node when it first sees a job step from a new allocation. It does not run the Prolog immediately when an allocation is granted. If no job steps from an allocation are run on a node, it will never run the Prolog for that allocation. This Prolog behavior can be changed by the PrologFlags parameter. The Epilog, on the other hand, always runs on every node of an allocation when the allocation is released. If the Epilog fails (returns a non-zero exit code), this will result in the node being set to a DRAIN state. If the EpilogSlurmctld fails (re- turns a non-zero exit code), this will only be logged. If the Prolog fails (returns a non-zero exit code), this will result in the node be- ing set to a DRAIN state and the job being requeued. The job will be placed in a held state unless nohold_on_prolog_fail is configured in SchedulerParameters. If the PrologSlurmctld fails (returns a non-zero exit code), this will result in the job being requeued to be executed on another node if possible. Only batch jobs can be requeued. Interac- tive jobs (salloc and srun) will be cancelled if the PrologSlurmctld fails. If slurmctld is stopped while either PrologSlurmctld or Epi- logSlurmctld is running, the script will be killed with SIGKILL. The script will restart when slurmctld restarts. Information about the job is passed to the script using environment variables. For a full list of environment variables please see the Pro- log and Epilog Guide <https://slurm.schedmd.com/prolog_epilog.html>. UNKILLABLE STEP PROGRAM SCRIPT This program can be used to take special actions to clean up the unkil- lable processes and/or notify system administrators. The program will be run as SlurmdUser (usually "root") on the compute node where Unkill- ableStepTimeout was triggered. Information about the unkillable job step is passed to the script using environment variables. SLURM_JOB_ID Job ID. SLURM_STEP_ID Job Step ID. Note that the special steps "batch", "interactive", and "extern" are reported not by name but with integer Step IDs 4294967291, 4294967290, and 4294967292 respectively. NETWORK TOPOLOGY Slurm is able to optimize job allocations to minimize network con- tention. Special Slurm logic is used to optimize allocations on sys- tems with a three-dimensional interconnect. and information about con- figuring those systems are available on web pages available here: <https://slurm.schedmd.com/>. For a hierarchical network, Slurm needs to have detailed information about how nodes are configured on the net- work switches. The TopologyPlugin parameter controls which plugin is used to collect network topology information. The only values presently supported are "topology/flat" (best-fit logic over one-dimensional topology), "topol- ogy/tree", and "topology/block" (both determine the network topology based upon information contained in a topology.conf or topology.yaml file, see "man topology.conf" and "man topology.yaml" for more informa- tion). Future plugins may gather topology information directly from the network. The topology information is optional. If not provided, Slurm will perform a best-fit algorithm assuming the nodes are in a one-dimensional array as configured and the communications cost is re- lated to the node distance in this array. RELOCATING CONTROLLERS If the cluster's computers used for the primary or backup controller will be out of service for an extended period of time, it may be desir- able to relocate them. In order to do so, follow this procedure: 1. Stop the Slurm daemons on the old controller and nodes. 2. Modify the slurm.conf file appropriately. 3. Copy the files from the StateSaveLocation to the new controller or ensure that they are accessible to the new controller via a shared drive. 4. Distribute the updated slurm.conf file to all nodes. 5. Restart the Slurm daemons on the new controller and nodes. There should be no loss of any pending jobs. Any running jobs will get the updated host info and finish normally. Ensure that any nodes added to the cluster have the current slurm.conf file installed. CAUTION: If two nodes are simultaneously configured as the primary con- troller (two nodes on which SlurmctldHost specify the local host and the slurmctld daemon is executing on each), system behavior will be de- structive. If a compute node has an incorrect SlurmctldHost parameter, that node may be rendered unusable, but no other harm will result. EXAMPLE # # Sample /etc/slurm.conf for dev[0-25].llnl.gov # Author: John Doe # Date: 11/06/2001 # SlurmctldHost=dev0(12.34.56.78) # Primary server SlurmctldHost=dev1(12.34.56.79) # Backup server # AuthType=auth/munge Epilog=/usr/local/slurm/epilog Prolog=/usr/local/slurm/prolog FirstJobId=65536 InactiveLimit=120 JobCompType=jobcomp/filetxt JobCompLoc=/var/log/slurm/jobcomp KillWait=30 MaxJobCount=10000 MinJobAge=300 PluginDir=/usr/local/lib:/usr/local/slurm/lib ReturnToService=0 SchedulerType=sched/backfill SlurmctldLogFile=/var/log/slurm/slurmctld.log SlurmdLogFile=/var/log/slurm/slurmd.log SlurmctldPort=7002 SlurmdPort=7003 SlurmdSpoolDir=/var/spool/slurmd.spool StateSaveLocation=/var/spool/slurm.state TmpFS=/tmp WaitTime=30 # # Node Configurations # NodeName=DEFAULT CPUs=2 RealMemory=2000 TmpDisk=64000 NodeName=DEFAULT State=UNKNOWN NodeName=dev[0-25] NodeAddr=edev[0-25] Weight=16 # Update records for specific DOWN nodes DownNodes=dev20 State=DOWN Reason="power,ETA=Dec25" # # Partition Configurations # PartitionName=DEFAULT MaxTime=30 MaxNodes=10 State=UP PartitionName=debug Nodes=dev[0-8,18-25] Default=YES PartitionName=batch Nodes=dev[9-17] MinNodes=4 PartitionName=long Nodes=dev[9-17] MaxTime=120 AllowGroups=admin INCLUDE MODIFIERS The "include" key word can be used with modifiers within the specified pathname. These modifiers would be replaced with cluster name or other information depending on which modifier is specified. If the included file is not an absolute path name (i.e. it does not start with a slash), it will searched for in the same directory as the slurm.conf file. %c Cluster name specified in the slurm.conf will be used. EXAMPLE ClusterName=linux include /home/slurm/etc/%c_config # Above line interpreted as # "include /home/slurm/etc/linux_config" FILE AND DIRECTORY PERMISSIONS There are three classes of files: Files used by slurmctld must be ac- cessible by user SlurmUser and accessible by the primary and backup control machines. Files used by slurmd must be accessible by user root and accessible from every compute node. A few files need to be acces- sible by normal users on all login and compute nodes. While many files and directories are listed below, most of them will not be used with most configurations. Epilog Must be executable by user root. It is recommended that the file be readable by all users. The file must exist on every compute node. EpilogSlurmctld Must be executable by user SlurmUser. It is recommended that the file be readable by all users. The file must be accessible by the primary and backup control machines. HealthCheckProgram Must be executable by user root. It is recommended that the file be readable by all users. The file must exist on every compute node. JobCompLoc If this specifies a file, it must be writable by user SlurmUser. The file must be accessible by the primary and backup control machines. MailProg Must be executable by user SlurmUser. Must not be writable by regular users. The file must be accessible by the primary and backup control machines. Prolog Must be executable by user root. It is recommended that the file be readable by all users. The file must exist on every compute node. PrologSlurmctld Must be executable by user SlurmUser. It is recommended that the file be readable by all users. The file must be accessible by the primary and backup control machines. ResumeProgram Must be executable by user SlurmUser. The file must be accessi- ble by the primary and backup control machines. slurm.conf Readable to all users on all nodes. Must not be writable by regular users. SlurmctldLogFile Must be writable by user SlurmUser. The file must be accessible by the primary and backup control machines. SlurmctldPidFile Must be writable by user root. Preferably writable and remov- able by SlurmUser. The file must be accessible by the primary and backup control machines. SlurmdLogFile Must be writable by user root. A distinct file must exist on each compute node. SlurmdPidFile Must be writable by user root. A distinct file must exist on each compute node. SlurmdSpoolDir Must be writable by user root. Permissions must be set to 755 so that job scripts can be executed from this directory. A dis- tinct file must exist on each compute node. SrunEpilog Must be executable by all users. The file must exist on every login and compute node. SrunProlog Must be executable by all users. The file must exist on every login and compute node. StateSaveLocation Must be writable by user SlurmUser. The file must be accessible by the primary and backup control machines. SuspendProgram Must be executable by user SlurmUser. The file must be accessi- ble by the primary and backup control machines. TaskEpilog Must be executable by all users. The file must exist on every compute node. TaskProlog Must be executable by all users. The file must exist on every compute node. UnkillableStepProgram Must be executable by user SlurmdUser. The file must be acces- sible by the primary and backup control machines. LOGGING Note that while Slurm daemons create log files and other files as needed, it treats the lack of parent directories as a fatal error. This prevents the daemons from running if critical file systems are not mounted and will minimize the risk of cold-starting (starting without preserving jobs). Log files and job accounting files may need to be created/owned by the "SlurmUser" uid to be successfully accessed. Use the "chown" and "chmod" commands to set the ownership and permissions appropriately. See the section FILE AND DIRECTORY PERMISSIONS for information about the various files and directories used by Slurm. It is recommended that the logrotate utility be used to ensure that various log files do not become too large. This also applies to text files used for accounting, process tracking, and the slurmdbd log if they are used. Here is a sample logrotate configuration. Make appropriate site modifi- cations and save as /etc/logrotate.d/slurm on all nodes. See the logrotate man page for more details. ## # Slurm Logrotate Configuration ## /var/log/slurm/*.log { compress missingok nocopytruncate nodelaycompress nomail notifempty noolddir rotate 5 sharedscripts size=5M create 640 slurm root postrotate pkill -x --signal SIGUSR2 slurmctld pkill -x --signal SIGUSR2 slurmd pkill -x --signal SIGUSR2 slurmdbd exit 0 endscript } COPYING Copyright (C) 2002-2007 The Regents of the University of California. Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). Copyright (C) 2008-2010 Lawrence Livermore National Security. Copyright (C) 2010-2022 SchedMD LLC. This file is part of Slurm, a resource management program. For de- tails, see <https://slurm.schedmd.com/>. Slurm is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your op- tion) any later version. Slurm is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. FILES /etc/slurm.conf SEE ALSO cgroup.conf(5), getaddrinfo(3), getrlimit(2), gres.conf(5), group(5), hostname(1), scontrol(1), slurmctld(8), slurmd(8), slurmdbd(8), slur- mdbd.conf(5), srun(1), spank(8), syslog(3), topology.conf(5) Slurm 25.11 Slurm Configuration File slurm.conf(5)
NAME | DESCRIPTION | PARAMETERS | NODE CONFIGURATION | DOWN NODE CONFIGURATION | NODESET CONFIGURATION | PARTITION CONFIGURATION | PROLOG AND EPILOG SCRIPTS | UNKILLABLE STEP PROGRAM SCRIPT | NETWORK TOPOLOGY | RELOCATING CONTROLLERS | EXAMPLE | INCLUDE MODIFIERS | FILE AND DIRECTORY PERMISSIONS | LOGGING | COPYING | FILES | SEE ALSO
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