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gres.conf(5) Slurm Configuration File gres.conf(5) NAME gres.conf - Slurm configuration file for Generic RESource (GRES) man- agement. DESCRIPTION gres.conf is an ASCII file which describes the configuration of Generic RESource(s) (GRES) on each compute node. If the GRES information in the slurm.conf file does not fully describe those resources, then a gres.conf file should be included on each compute node. For cloud nodes, a gres.conf file that includes all the cloud nodes must be on all cloud nodes and the controller. The file will always be located in the same directory as slurm.conf. If the GRES information in the slurm.conf file fully describes those resources (i.e. no "Cores", "File" or "Links" specification is required for that GRES type or that information is automatically detected), that information may be omitted from the gres.conf file and only the config- uration information in the slurm.conf file will be used. The gres.conf file may be omitted completely if the configuration information in the slurm.conf file fully describes all GRES. If using the gres.conf file to describe the resources available to nodes, the first parameter on the line should be NodeName. If configur- ing Generic Resources without specifying nodes, the first parameter on the line should be Name. Parameter names are case insensitive. 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, daemon receipt of the SIGHUP signal, or execution of the command "scontrol reconfigure" unless otherwise noted. NOTE: Slurm support for gres/[mps|shard] requires the use of the se- lect/cons_tres plugin. For more information on how to configure MPS, see https://slurm.schedmd.com/gres.html#MPS_Management. For more in- formation on how to configure Sharding, see https://slurm.schedmd.com/gres.html#Sharding. For more information on GRES scheduling in general, see https://slurm.schedmd.com/gres.html. The overall configuration parameters available include: AutoDetect The hardware detection mechanisms to enable for automatic GRES configuration. Currently, the options are: nrt Automatically detect AWS Trainium/Inferentia devices. nvidia Automatically detect NVIDIA GPUs. No library required, but doesn't detect MIGs or NVlinks. Added in Slurm 24.11. nvml Automatically detect NVIDIA GPUs. Requires the NVIDIA Management Library (NVML). off Do not automatically detect any GPUs. Used to override other options. oneapi Automatically detect Intel GPUs. Requires the Intel Graphics Compute Runtime for oneAPI Level Zero and OpenCL Driver (oneapi). rsmi Automatically detect AMD GPUs. Requires the ROCm System Management Interface (ROCm SMI) Library. AutoDetect can be on a line by itself, in which case it will globally apply to all lines in gres.conf by default. In addi- tion, AutoDetect can be combined with NodeName to only apply to certain nodes. Node-specific AutoDetects will trump the global AutoDetect. A node-specific AutoDetect only needs to be speci- fied once per node. If specified multiple times for the same nodes, they must all be the same value. To unset AutoDetect for a node when a global AutoDetect is set, simply set it to "off" in a node-specific GRES line. E.g.: NodeName=tux3 AutoDe- tect=off Name=gpu File=/dev/nvidia[0-3]. AutoDetect cannot be used with cloud nodes. AutoDetect will automatically detect files, cores, links, and any other hardware. If a parameter such as File, Cores, or Links are specified when AutoDetect is used, then the specified values are used to sanity check the auto detected values. If there is a mismatch, then the node's state is set to invalid and the node is drained. Count Number of resources of this name/type available on this node. The default value is set to the number of File values specified (if any), otherwise the default value is one. A suffix of "K", "M", "G", "T" or "P" may be used to multiply the number by 1024, 1048576, 1073741824, etc. respectively. For example: "Count=10G". Cores Optionally specify the core index numbers matching the specific sockets* which can use this resource. If this option is used, all the cores in a socket* must be spec- ified together. While Slurm can track and assign resources at the CPU or thread level, its scheduling algorithms used to co-allocate GRES devices with CPUs operates at a socket* level for job allocations. Therefore, it is not possible to preferen- tially assign GRES with different specific CPUs on the same socket*. *Sockets may be substituted for NUMA nodes with SlurmdParame- ters=numa_node_as_socket or l3cache with SlurmdParame- ters=l3cache_as_socket. Multiple cores may be specified using a comma-delimited list or a range may be specified using a "-" separator (e.g. "0,1,2,3" or "0-3"). If a job specifies --gres-flags=enforce-binding, then only the identified cores can be allocated with each generic resource. This will tend to improve performance of jobs, but delay the allocation of resources to them. If specified and a job is not submitted with the --gres-flags=enforce-binding op- tion the identified cores will be preferred for scheduling with each generic resource. If --gres-flags=disable-binding is specified, then any core can be used with the resources, which also increases the speed of Slurm's scheduling algorithm but can degrade the application performance. The --gres-flags=disable-binding option is cur- rently required to use more CPUs than are bound to a GRES (e.g. if a GPU is bound to the CPUs on one socket, but resources on more than one socket are required to run the job). If any core can be effectively used with the resources, then do not specify the cores option for improved speed in the Slurm scheduling logic. A restart of the slurmctld is needed for changes to the Cores option to take effect. NOTE: Since Slurm must be able to perform resource management on heterogeneous clusters having various processing unit numbering schemes, a logical core index must be specified instead of the physical core index. That logical core index might not corre- spond to your physical core index number. Core 0 will be the first core on the first socket, while core 1 will be the second core on the first socket. This numbering coincides with the logical core number (Core L#) seen in "lstopo -l" command out- put. File Fully qualified pathname of the device files associated with a resource. The name can include a numeric range suffix to be in- terpreted by Slurm (e.g. File=/dev/nvidia[0-3]). This field is generally required if enforcement of generic re- source allocations is to be supported (i.e. prevents users from making use of resources allocated to a different user). En- forcement of the file allocation relies upon Linux Control Groups (cgroups) and Slurm's task/cgroup plugin, which will place the allocated files into the job's cgroup and prevent use of other files. Please see Slurm's Cgroups Guide for more in- formation: https://slurm.schedmd.com/cgroups.html. If File is specified then Count must be either set to the number of file names specified or not set (the default value is the number of files specified). The exception to this is MPS/Shard- ing. For either of these GRES, each GPU would be identified by device file using the File parameter and Count would specify the number of entries that would correspond to that GPU. For MPS, typically 100 or some multiple of 100. For Sharding typically the maximum number of jobs that could simultaneously share that GPU. If using a card with Multi-Instance GPU functionality, use Mul- tipleFiles instead. File and MultipleFiles are mutually exclu- sive. NOTE: File is required for all gpu typed GRES. NOTE: If you specify the File parameter for a resource on some node, the option must be specified on all nodes and Slurm will track the assignment of each specific resource on each node. Otherwise Slurm will only track a count of allocated resources rather than the state of each individual device file. NOTE: Drain a node before changing the count of records with File parameters (e.g. if you want to add or remove GPUs from a node's configuration). Failure to do so will result in any job using those GRES being aborted. NOTE: When specifying File, Count is limited in size (currently 1024) for each node. Flags Optional flags that can be specified to change configured behav- ior of the GRES. Allowed values at present are: CountOnly Do not attempt to load a plugin of the GRES type as this GRES will only be used to track counts of GRES used. This avoids attempting to load non-existent plugin which can affect filesystems with high latency metadata oper- ations for non-existent files. NOTE: If a gres has this flag configured it is global, so all other nodes with that gres will have this flag implied. explicit If the flag is set, GRES is not allocated to the job as part of whole node allocation (--exclusive or OverSubscribe=EXCLUSIVE set on partition) unless it was explicitly re- quested by the job. NOTE: If a gres has this flag configured it is global, so all other nodes with that gres will have this flag implied. one_sharing To be used on a shared gres. If using a shared gres (mps) on top of a sharing gres (gpu) only allow one of the sharing gres to be used by the shared gres. This is the de- fault for MPS. NOTE: If a gres has this flag configured it is global, so all other nodes with that gres will have this flag implied. This flag is not compatible with all_sharing for a spe- cific gres. all_sharing To be used on a shared gres. This is the op- posite of one_sharing and can be used to al- low all sharing gres (gpu) on a node to be used for shared gres (mps). NOTE: If a gres has this flag configured it is global, so all other nodes with that gres will have this flag implied. This flag is not compatible with one_sharing for a spe- cific gres. nvidia_gpu_env Set environment variable CUDA_VISIBLE_DE- VICES for all GPUs on the specified node(s). amd_gpu_env Set environment variable ROCR_VISIBLE_DE- VICES for all GPUs on the specified node(s). intel_gpu_env Set environment variable ZE_AFFINITY_MASK for all GPUs on the specified node(s). opencl_env Set environment variable GPU_DEVICE_ORDINAL for all GPUs on the specified node(s). no_gpu_env Set no GPU-specific environment variables. This is mutually exclusive to all other en- vironment-related flags. If no environment-related flags are specified, then nvidia_gpu_env, amd_gpu_env, intel_gpu_env, and opencl_env will be implicitly set by default. If AutoDetect is used and envi- ronment-related flags are not specified, then AutoDetect=nvml or AutoDetect=nvidia will set nvidia_gpu_env, AutoDetect=rsmi will set amd_gpu_env, and AutoDetect=oneapi will set intel_gpu_env. Conversely, specified environment-related flags will always override AutoDetect. Environment-related flags set on one GRES line will be inherited by the GRES line directly below it if no environment-related flags are specified on that line and if it is of the same node, name, and type. Environment-related flags must be the same for GRES of the same node, name, and type. Note that there is a known issue with the AMD ROCm runtime where ROCR_VISIBLE_DEVICES is processed first, and then CUDA_VISI- BLE_DEVICES is processed. To avoid the issues caused by this, set Flags=amd_gpu_env for AMD GPUs so only ROCR_VISIBLE_DEVICES is set. Links A comma-delimited list of numbers identifying the number of con- nections between this device and other devices to allow cosched- uling of better connected devices. This is an ordered list in which the number of connections this specific device has to de- vice number 0 would be in the first position, the number of con- nections it has to device number 1 in the second position, etc. A -1 indicates the device itself and a 0 indicates no connec- tion. If specified, then this line can only contain a single GRES device (i.e. can only contain a single file via File). This is an optional value and is usually automatically deter- mined if AutoDetect is enabled. A typical use case would be to identify GPUs having NVLink connectivity. Note that for GPUs, the minor number assigned by the OS and used in the device file (i.e. the X in /dev/nvidiaX) is not necessarily the same as the device number/index. The device number is created by sorting the GPUs by PCI bus ID and then numbering them starting from the smallest bus ID. See https://slurm.schedmd.com/gres.html#GPU_Management MultipleFiles Fully qualified pathname of the device files associated with a resource. Graphics cards using Multi-Instance GPU (MIG) tech- nology will present multiple device files that should be managed as a single generic resource. The file names can be a comma sep- arated list or it can include a numeric range suffix (e.g. Mul- tipleFiles=/dev/nvidia[0-3]). Drain a node before changing the count of records with the Mul- tipleFiles parameter, such as when adding or removing GPUs from a node's configuration. Failure to do so will result in any job using those GRES being aborted. When not using GPUs with MIG functionality, use File instead. MultipleFiles and File are mutually exclusive. Name Name of the generic resource. Any desired name may be used. The name must match a value in GresTypes in slurm.conf. Each generic resource has an optional plugin which can provide re- source-specific functionality. Generic resources that currently include an optional plugin are: gpu Graphics Processing Unit mps CUDA Multi-Process Service (MPS) nic Network Interface Card shard Shards of a gpu NodeName An optional NodeName specification can be used to permit one gres.conf file to be used for all compute nodes in a cluster by specifying the node(s) that each line should apply to. The NodeName specification can use a Slurm hostlist specification as shown in the example below. Type An optional arbitrary string identifying the type of generic re- source. For example, this might be used to identify a specific model of GPU, which users can then specify in a job request. For changes to the Type option to take effect with a scontrol reconfig all affected slurmd daemons must be responding to the slurmctld. Otherwise a restart of the slurmctld and slurmd dae- mons is required. NOTE: If using autodetect functionality and defining the Type in your gres.conf file, the Type specified should match or be a substring of the value that is detected, using an underscore in lieu of any spaces. EXAMPLES ################################################################## # Slurm's Generic Resource (GRES) configuration file # Define GPU devices with MPS support, with AutoDetect sanity checking ################################################################## AutoDetect=nvml Name=gpu Type=gtx560 File=/dev/nvidia0 COREs=0,1 Name=gpu Type=tesla File=/dev/nvidia1 COREs=2,3 Name=mps Count=100 File=/dev/nvidia0 COREs=0,1 Name=mps Count=100 File=/dev/nvidia1 COREs=2,3 ################################################################## # Slurm's Generic Resource (GRES) configuration file # Overwrite system defaults and explicitly configure three GPUs ################################################################## Name=gpu Type=tesla File=/dev/nvidia[0-1] COREs=0,1 # Name=gpu Type=tesla File=/dev/nvidia[2-3] COREs=2,3 # NOTE: nvidia2 device is out of service Name=gpu Type=tesla File=/dev/nvidia3 COREs=2,3 ################################################################## # Slurm's Generic Resource (GRES) configuration file # Use a single gres.conf file for all compute nodes - positive method ################################################################## ## Explicitly specify devices on nodes tux0-tux15 # NodeName=tux[0-15] Name=gpu File=/dev/nvidia[0-3] # NOTE: tux3 nvidia1 device is out of service NodeName=tux[0-2] Name=gpu File=/dev/nvidia[0-3] NodeName=tux3 Name=gpu File=/dev/nvidia[0,2-3] NodeName=tux[4-15] Name=gpu File=/dev/nvidia[0-3] ################################################################## # Slurm's Generic Resource (GRES) configuration file # Use NVML to gather GPU configuration information # for all nodes except one ################################################################## AutoDetect=nvml NodeName=tux3 AutoDetect=off Name=gpu File=/dev/nvidia[0-3] ################################################################## # Slurm's Generic Resource (GRES) configuration file # Specify some nodes with NVML, some with RSMI, and some with no AutoDetect ################################################################## NodeName=tux[0-7] AutoDetect=nvml NodeName=tux[8-11] AutoDetect=rsmi NodeName=tux[12-15] Name=gpu File=/dev/nvidia[0-3] ################################################################## # Slurm's Generic Resource (GRES) configuration file # Define 'bandwidth' GRES to use as a way to limit the # resource use on these nodes for workflow purposes ################################################################## NodeName=tux[0-7] Name=bandwidth Type=lustre Count=4G Flags=CountOnly COPYING Copyright (C) 2010 The Regents of the University of California. Pro- duced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). 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. SEE ALSO slurm.conf(5) Slurm 25.11 Slurm Configuration File gres.conf(5)
NAME | DESCRIPTION | EXAMPLES | COPYING | SEE ALSO
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