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salloc(1) Slurm Commands salloc(1)

NAME
salloc - Obtain a Slurm job allocation (a set of nodes), execute a com-
mand, and then release the allocation when the command is finished.

SYNOPSIS
salloc [OPTIONS(0)...] [ : [OPTIONS(N)...]] [command(0) [args(0)...]]

Option(s) define multiple jobs in a co-scheduled heterogeneous job.
For more details about heterogeneous jobs see the document
https://slurm.schedmd.com/heterogeneous_jobs.html

DESCRIPTION
salloc is used to allocate a Slurm job allocation, which is a set of
resources (nodes), possibly with some set of constraints (e.g. number
of processors per node). When salloc successfully obtains the requested
allocation, it then runs the command specified by the user. Finally,
when the user specified command is complete, salloc relinquishes the
job allocation.

The command may be any program the user wishes. Some typical commands
are xterm, a shell script containing srun commands, and srun (see the
EXAMPLES section). If no command is specified, then salloc runs the
user's default shell.

The following document describes the influence of various options on
the allocation of cpus to jobs and tasks.
https://slurm.schedmd.com/cpu_management.html

NOTE: The salloc logic includes support to save and restore the termi-
nal line settings and is designed to be executed in the foreground. If
you need to execute salloc in the background, set its standard input to
some file, for example: "salloc -n16 a.out </dev/null &"

RETURN VALUE
If salloc is unable to execute the user command, it will return 1 and
print errors to stderr. Else if success or if killed by signals HUP,
INT, KILL, or QUIT: it will return 0.

COMMAND PATH RESOLUTION
If provided, the command is resolved in the following order:

1. If command starts with ".", then path is constructed as: current
working directory / command
2. If command starts with a "/", then path is considered absolute.
3. If command can be resolved through PATH. See path_resolution(7).
4. If command is in current working directory.

Current working directory is the calling process working directory un-
less the --chdir argument is passed, which will override the current
working directory.

OPTIONS
-A, --account=<account>
Charge resources used by this job to specified account. The ac-
count is an arbitrary string. The account name may be changed
after job submission using the scontrol command.

--acctg-freq=<datatype>=<interval>[,<datatype>=<interval>...]
Define the job accounting and profiling sampling intervals in
seconds. This can be used to override the JobAcctGatherFre-
quency parameter in the slurm.conf file. <datatype>=<interval>
specifies the task sampling interval for the jobacct_gather plu-
gin or a sampling interval for a profiling type by the
acct_gather_profile plugin. Multiple comma-separated
<datatype>=<interval> pairs may be specified. Supported datatype
values are:

task Sampling interval for the jobacct_gather plugins and
for task profiling by the acct_gather_profile plu-
gin.
NOTE: This frequency is used to monitor memory us-
age. If memory limits are enforced the highest fre-
quency a user can request is what is configured in
the slurm.conf file. It can not be disabled.

energy Sampling interval for energy profiling using the
acct_gather_energy plugin.

network Sampling interval for infiniband profiling using the
acct_gather_interconnect plugin.

filesystem Sampling interval for filesystem profiling using the
acct_gather_filesystem plugin.

The default value for the task sampling interval is 30 seconds.
The default value for all other intervals is 0. An interval of
0 disables sampling of the specified type. If the task sampling
interval is 0, accounting information is collected only at job
termination (reducing Slurm interference with the job).
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.

--bb=<spec>
Burst buffer specification. The form of the specification is
system dependent. Note the burst buffer may not be accessible
from a login node, but require that salloc spawn a shell on one
of its allocated compute nodes. When the --bb option is used,
Slurm parses this option and creates a temporary burst buffer
script file that is used internally by the burst buffer plugins.
See Slurm's burst buffer guide for more information and exam-
ples:
https://slurm.schedmd.com/burst_buffer.html

--bbf=<file_name>
Path of file containing burst buffer specification. The form of
the specification is system dependent. Also see --bb. Note the
burst buffer may not be accessible from a login node, but re-
quire that salloc spawn a shell on one of its allocated compute
nodes. See Slurm's burst buffer guide for more information and
examples:
https://slurm.schedmd.com/burst_buffer.html

--begin=<time>
Defer eligibility of this job allocation until the specified
time.

Time may be of the form HH:MM:SS to run a job at a specific time
of day (seconds are optional). (If that time is already past,
the next day is assumed.) You may also specify midnight, noon,
elevenses (11 AM), fika (3 PM) or teatime (4 PM) and you can
have a time-of-day suffixed with AM or PM for running in the
morning or the evening. You can also say what day the job will
be run, by specifying a date of the form MMDDYY or MM/DD/YY
YYYY-MM-DD. Combine date and time using the following format
YYYY-MM-DD[THH:MM[:SS]]. You can also give times like now +
count time-units, where the time-units can be seconds (default),
minutes, hours, days, or weeks and you can tell Slurm to run the
job today with the keyword today and to run the job tomorrow
with the keyword tomorrow. The value may be changed after job
submission using the scontrol command. For example:
--begin=16:00
--begin=now+1hour
--begin=now+60 (seconds by default)
--begin=2010-01-20T12:34:00

Notes on date/time specifications:
- Although the 'seconds' field of the HH:MM:SS time specifica-
tion is allowed by the code, note that the poll time of the
Slurm scheduler is not precise enough to guarantee dispatch of
the job on the exact second. The job will be eligible to start
on the next poll following the specified time. The exact poll
interval depends on the Slurm scheduler (e.g., 60 seconds with
the default sched/builtin).
- If no time (HH:MM:SS) is specified, the default is
(00:00:00).
- If a date is specified without a year (e.g., MM/DD) then the
current year is assumed, unless the combination of MM/DD and
HH:MM:SS has already passed for that year, in which case the
next year is used.

--bell Force salloc to ring the terminal bell when the job allocation
is granted (and only if stdout is a tty). By default, salloc
only rings the bell if the allocation is pending for more than
ten seconds (and only if stdout is a tty). Also see the option
--no-bell.

-D, --chdir=<path>
Change directory to path before beginning execution. The path
can be specified as full path or relative path to the directory
where the command is executed.

--cluster-constraint=<list>
Specifies features that a federated cluster must have to have a
sibling job submitted to it. Slurm will attempt to submit a sib-
ling job to a cluster if it has at least one of the specified
features.

-M, --clusters=<string>
Clusters to issue commands to. Multiple cluster names may be
comma separated. The job will be submitted to the one cluster
providing the earliest expected job initiation time. The default
value is the current cluster. A value of 'all' will query to run
on all clusters. Note that the slurmdbd must be up for this op-
tion to work properly, unless running in a federation with Fed-
erationParameters=fed_display configured.

--comment=<string>
An arbitrary comment.

--consolidate-segments
Ensure that all segments from the allocation will be consoli-
dated into one higher-level aggregated block.

This option applies to job allocations. NOTE: This option will
only work with the topology/block plugin.

-C, --constraint=<list>
Nodes can have features assigned to them by the Slurm adminis-
trator. Users can specify which of these features are required
by their job using the constraint option. If you are looking for
'soft' constraints please see --prefer for more information.
Only nodes having features matching the job constraints will be
used to satisfy the request. Multiple constraints may be speci-
fied with AND, OR, matching OR, resource counts, etc. (some op-
erators are not supported on all system types).

NOTE: Changeable features are features defined by a NodeFeatures
plugin.

Supported --constraint options include:

Single Name
Only nodes which have the specified feature will be used.
For example, --constraint="intel"

Node Count
A request can specify the number of nodes needed with
some feature by appending an asterisk and count after the
feature name. For example, --nodes=16 --con-
straint="graphics*4" indicates that the job requires 16
nodes and that at least four of those nodes must have the
feature "graphics." If requesting more than one feature
and using node counts, the request must have square
brackets surrounding it.

NOTE: This option is not supported by the helpers Node-
Features plugin. Heterogeneous jobs can be used instead.

AND Only nodes with all of specified features will be used.
The ampersand is used for an AND operator. For example,
--constraint="intel&gpu"

OR Only nodes with at least one of specified features will
be used. The vertical bar is used for an OR operator. If
changeable features are not requested, nodes in the allo-
cation can have different features. For example, salloc
-N2 --constraint="intel|amd" can result in a job alloca-
tion where one node has the intel feature and the other
node has the amd feature. However, if the expression
contains a changeable feature, then all OR operators are
automatically treated as Matching OR so that all nodes in
the job allocation have the same set of features. For ex-
ample, salloc -N2 --constraint="foo|bar&baz" The job is
allocated two nodes where both nodes have foo, or bar and
baz (one or both nodes could have foo, bar, and baz). The
helpers NodeFeatures plugin will find the first set of
node features that matches all nodes in the job alloca-
tion; these features are set as active features on the
node and passed to RebootProgram (see slurm.conf(5)) and
the helper script (see helpers.conf(5)). In this case,
the helpers plugin uses the first of "foo" or "bar,baz"
that match the two nodes in the job allocation.

Matching OR
If only one of a set of possible options should be used
for all allocated nodes, then use the OR operator and en-
close the options within square brackets. For example,
--constraint="[rack1|rack2|rack3|rack4]" might be used to
specify that all nodes must be allocated on a single rack
of the cluster, but any of those four racks can be used.

Multiple Counts
Specific counts of multiple resources may be specified by
using the AND operator and enclosing the options within
square brackets. For example, --con-
straint="[rack1*2&rack2*4]" might be used to specify that
two nodes must be allocated from nodes with the feature
of "rack1" and four nodes must be allocated from nodes
with the feature "rack2".

NOTE: This option is not supported by the helpers Node-
Features plugin.

NOTE: Multiple Counts can cause jobs to be allocated with
a non-optimal network layout.

Brackets
Brackets can be used to indicate that you are looking for
a set of nodes with the different requirements contained
within the brackets. For example, --con-
straint="[(rack1|rack2)*1&(rack3)*2]" will get you one
node with either the "rack1" or "rack2" features and two
nodes with the "rack3" feature. If requesting more than
one feature and using node counts, the request must have
square brackets surrounding it.

NOTE: Brackets are only reserved for Multiple Counts and
Matching OR syntax. AND operators require a count for
each feature inside square brackets (i.e.
"[quad*2&hemi*1]"). Slurm will only allow a single set of
bracketed constraints per job.

NOTE: Square brackets are not supported by the helpers
NodeFeatures plugin. Matching OR can be requested without
square brackets by using the vertical bar character with
at least one changeable feature.

Parentheses
Parentheses can be used to group like node features to-
gether. For example, --con-
straint="[(knl&snc4&flat)*4&haswell*1]" might be used to
specify that four nodes with the features "knl", "snc4"
and "flat" plus one node with the feature "haswell" are
required. Parentheses can also be used to group opera-
tions. Without parentheses, node features are parsed
strictly from left to right. For example, --con-
straint="foo&bar|baz" requests nodes with foo and bar, or
baz. --constraint="foo|bar&baz" requests nodes with foo
and baz, or bar and baz (note how baz was AND'd with
everything). --constraint="foo&(bar|baz)" requests nodes
with foo and at least one of bar or baz. NOTE: OR within
parentheses should not be used with a KNL NodeFeatures
plugin but is supported by the helpers NodeFeatures plu-
gin.

--container=<path_to_container>
Absolute path to OCI container bundle.

--container-id=<container_id>
Unique name for OCI container.

--contiguous
If set, then the allocated nodes must form a contiguous set.

NOTE: This option will only work with the topology/flat plugin.
Other topology plugins modify the node ordering and prevent this
option from taking effect.

-S, --core-spec=<num>
Count of Specialized Cores per node reserved by the job for sys-
tem operations and not used by the application. If AllowSpecRe-
sourcesUsage is enabled a job can override the CoreSpecCount of
all its allocated nodes with this option. The overridden Spe-
cialized Cores will still be reserved for system processes. The
job will get an implicit --exclusive allocation for the rest of
the Cores on the nodes, resulting in the job's processes being
able to use (and being charged for) all the Cores on the nodes
except for the overridden Specialized Cores. This option can
not be used with the --thread-spec option.

NOTE: Explicitly setting a job's specialized core value implic-
itly sets the --exclusive option.

--cores-per-socket=<cores>
Restrict node selection to nodes with at least the specified
number of cores per socket. See additional information under -B
option above when task/affinity plugin is enabled.
NOTE: This option may implicitly set the number of tasks (if -n
was not specified) as one task per requested thread.

--cpu-freq=<p1>[-p2][:p3]

Request that job steps initiated by srun commands inside this
allocation be run at some requested frequency if possible, on
the CPUs selected for the step on the compute node(s).

p1 can be [#### | low | medium | high | highm1] which will set
the frequency scaling_speed to the corresponding value, and set
the frequency scaling_governor to UserSpace. See below for defi-
nition of the values.

p1 can be [Conservative | OnDemand | Performance | PowerSave]
which will set the scaling_governor to the corresponding value.
The governor has to be in the list set by the slurm.conf option
CpuFreqGovernors.

When p2 is present, p1 will be the minimum scaling frequency and
p2 will be the maximum scaling frequency. In that case the gov-
ernor p3 or CpuFreqDef cannot be UserSpace since it doesn't sup-
port a range.

p2 can be [#### | medium | high | highm1]. p2 must be greater
than p1 and is incompatible with UserSpace governor.

If p3 is UserSpace, the frequency scaling_speed, scal-
ing_max_freq and scaling_min_freq will be statically set to the
value defined by p1.

Any requested frequency below the minimum available frequency
will be rounded to the minimum available frequency. In the same
way, any requested frequency above the maximum available fre-
quency will be rounded to the maximum available frequency.

The CpuFreqDef parameter in slurm.conf will be used to set the
governor in absence of p3. If there's no CpuFreqDef, the default
governor will be to use the system current governor set in each
cpu. Specifying a range without CpuFreqDef or a specific gover-
nor is therefore not allowed.

Acceptable values at present include:

#### frequency in kilohertz

Low the lowest available frequency

High the highest available frequency

HighM1 (high minus one) will select the next highest
available frequency

Medium attempts to set a frequency in the middle of the
available range

Conservative attempts to use the Conservative CPU governor

OnDemand attempts to use the OnDemand CPU governor (the de-
fault value)

Performance attempts to use the Performance CPU governor

PowerSave attempts to use the PowerSave CPU governor

UserSpace attempts to use the UserSpace CPU governor

The following informational environment variable is set
in the job
step when --cpu-freq option is requested.
SLURM_CPU_FREQ_REQ

This environment variable can also be used to supply the value
for the CPU frequency request if it is set when the 'srun' com-
mand is issued. The --cpu-freq on the command line will over-
ride the environment variable value. The form on the environment
variable is the same as the command line. See the ENVIRONMENT
VARIABLES section for a description of the SLURM_CPU_FREQ_REQ
variable.

NOTE: This parameter is treated as a request, not a requirement.
If the job step's node does not support setting the CPU fre-
quency, or the requested value is outside the bounds of the le-
gal frequencies, an error is logged, but the job step is allowed
to continue.

NOTE: Setting the frequency for just the CPUs of the job step
implies that the tasks are confined to those CPUs. If task con-
finement (i.e. the task/affinity TaskPlugin is enabled, or the
task/cgroup TaskPlugin is enabled with "ConstrainCores=yes" set
in cgroup.conf) is not configured, this parameter is ignored.

NOTE: When the step completes, the frequency and governor of
each selected CPU is reset to the previous values.

NOTE: When submitting jobs with the --cpu-freq option with lin-
uxproc as the ProctrackType can cause jobs to run too quickly
before Accounting is able to poll for job information. As a re-
sult not all of accounting information will be present.

--cpus-per-gpu=<ncpus>
Request that ncpus processors be allocated per allocated GPU.
Steps inheriting this value will imply --exact. Not compatible
with the --cpus-per-task option.

-c, --cpus-per-task=<ncpus>
Advise Slurm that ensuing job steps will require ncpus proces-
sors per task. By default Slurm will allocate one processor per
task.

For instance, consider an application that has 4 tasks, each re-
quiring 3 processors. If our cluster is comprised of
quad-processors nodes and we simply ask for 12 processors, the
controller might give us only 3 nodes. However, by using the
--cpus-per-task=3 options, the controller knows that each task
requires 3 processors on the same node, and the controller will
grant an allocation of 4 nodes, one for each of the 4 tasks.

--deadline=<OPT>
Remove the job if no ending is possible before this deadline
(start > (deadline - time[-min])). Default is no deadline. Note
that if neither DefaultTime nor MaxTime are configured on the
partition the job is in, the job will need to specify some form
of time limit (--time[-min]) if a deadline is to be used.

Valid time formats are:
HH:MM[:SS] [AM|PM]
MMDD[YY] or MM/DD[/YY] or MM.DD[.YY]
MM/DD[/YY]-HH:MM[:SS]
YYYY-MM-DD[THH:MM[:SS]]
now[+count[seconds(default)|minutes|hours|days|weeks]]
midnight, elevenses (11 AM), noon, fika (3 PM), teatime (4 PM),
or tomorrow

One or more time strings may be specified (e.g., 'tomor-
row18:00'). If there is a conflict between them, the last one
will silently take precedence.

--delay-boot=<minutes>
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 spec-
ified period, it will use only nodes which already have the
specified features. The argument is in units of minutes. A de-
fault value may be set by a system administrator using the de-
lay_boot option of the SchedulerParameters configuration parame-
ter in the slurm.conf file, otherwise the default value is zero
(no delay).

-d, --dependency=<dependency_list>
Defer the start of this job until the specified dependencies
have been satisfied. Once a dependency is satisfied, it is re-
moved from the job. <dependency_list> is of the form
<type:job_id[:job_id][,type:job_id[:job_id]]> or
<type:job_id[:job_id][?type:job_id[:job_id]]>. All dependencies
must be satisfied if the "," separator is used. Any dependency
may be satisfied if the "?" separator is used. Only one separa-
tor may be used. For instance:
-d afterok:20:21,afterany:23
means that the job can run only after a 0 return code of jobs 20
and 21 AND completion of job 23. However:
-d afterok:20:21?afterany:23
means that any of the conditions (afterok:20 OR afterok:21 OR
afterany:23) will be enough to release the job. Many jobs can
share the same dependency and these jobs may even belong to dif-
ferent users. The value may be changed after job submission us-
ing the scontrol command. Dependencies on remote jobs are al-
lowed in a federation. Once a job dependency fails due to the
termination state of a preceding job, the dependent job will
never be run, even if the preceding job is requeued and has a
different termination state in a subsequent execution.

after:job_id[[+time][:jobid[+time]...]]
After the specified jobs start or are cancelled and
'time' in minutes from job start or cancellation happens,
this job can begin execution. If no 'time' is given then
there is no delay after start or cancellation.

afterany:job_id[:jobid...]
This job can begin execution after the specified jobs
have terminated. This is the default dependency type.

afterburstbuffer:job_id[:jobid...]
This job can begin execution after the specified jobs
have terminated and any associated burst buffer stage out
operations have completed.

aftercorr:job_id[:jobid...]
A task of this job array can begin execution after the
corresponding task ID in the specified job has completed
successfully (ran to completion with an exit code of
zero). If the specified job is not an array, this is
treated the same as afterok.

afternotok:job_id[:jobid...]
This job can begin execution after the specified jobs
have terminated in some failed state (non-zero exit code,
node failure, timed out, etc). This job must be submit-
ted while the specified job is still active or within
MinJobAge seconds after the specified job has ended. If
the dependent job id is not found and is on the same
cluster as the job submission, the job is rejected. If
the dependent job id is not found and is on a different
cluster from the job submission, the dependency is marked
as failed.

afterok:job_id[:jobid...]
This job can begin execution after the specified jobs
have successfully executed (ran to completion with an
exit code of zero). This job must be submitted while the
specified job is still active or within MinJobAge seconds
after the specified job has ended. If the dependent job
id is not found and is on the same cluster as the job
submission, the job is rejected. If the dependent job id
is not found and is on a different cluster from the job
submission, the dependency is marked as failed.

singleton
This job can begin execution after any previously
launched jobs sharing the same job name and user have
terminated. In other words, only one job by that name
and owned by that user can be running or suspended at any
point in time. In a federation, a singleton dependency
must be fulfilled on all clusters unless DependencyPara-
meters=disable_remote_singleton is used in slurm.conf.

-m, --distribution={*|block|cyclic|arbi-
trary|plane=<size>}[:{*|block|cyclic|fcyclic}[:{*|block|cyclic|fcyclic}]][,{Pack|NoPack}]

Specify alternate distribution methods for remote processes.
For job allocation, this sets environment variables that will be
used by subsequent srun requests and also affects which cores
will be selected for job allocation.

This option controls the distribution of tasks to the nodes on
which resources have been allocated, and the distribution of
those resources to tasks for binding (task affinity). The first
distribution method (before the first ":") controls the distrib-
ution of tasks to nodes. The second distribution method (after
the first ":") controls the distribution of allocated CPUs
across sockets for binding to tasks. The third distribution
method (after the second ":") controls the distribution of allo-
cated CPUs across cores for binding to tasks. The second and
third distributions apply only if task affinity is enabled. The
third distribution is supported only if the task/cgroup plugin
is configured. The default value for each distribution type is
specified by *.

Note that with select/cons_tres, the number of CPUs allocated to
each socket and node may be different. Refer to
https://slurm.schedmd.com/mc_support.html for more information
on resource allocation, distribution of tasks to nodes, and
binding of tasks to CPUs.
First distribution method (distribution of tasks across nodes):

* Use the default method for distributing tasks to nodes
(block).

block The block distribution method will distribute tasks to a
node such that consecutive tasks share a node. For exam-
ple, consider an allocation of three nodes each with two
cpus. A four-task block distribution request will dis-
tribute those tasks to the nodes with tasks one and two
on the first node, task three on the second node, and
task four on the third node. Block distribution is the
default behavior if the number of tasks exceeds the num-
ber of allocated nodes.

cyclic The cyclic distribution method will distribute tasks to a
node such that consecutive tasks are distributed over
consecutive nodes (in a round-robin fashion). For exam-
ple, consider an allocation of three nodes each with two
cpus. A four-task cyclic distribution request will dis-
tribute those tasks to the nodes with tasks one and four
on the first node, task two on the second node, and task
three on the third node. Note that when SelectType is
select/cons_tres, the same number of CPUs may not be al-
located on each node. Task distribution will be
round-robin among all the nodes with CPUs yet to be as-
signed to tasks. Cyclic distribution is the default be-
havior if the number of tasks is no larger than the num-
ber of allocated nodes.

plane The tasks are distributed in blocks of size <size>. The
size must be given or SLURM_DIST_PLANESIZE must be set.
The number of tasks distributed to each node is the same
as for cyclic distribution, but the taskids assigned to
each node depend on the plane size. Additional distribu-
tion specifications cannot be combined with this option.
For more details (including examples and diagrams),
please see https://slurm.schedmd.com/mc_support.html and
https://slurm.schedmd.com/dist_plane.html

arbitrary
The arbitrary method of distribution will allocate
processes in-order as listed in file designated by the
environment variable SLURM_HOSTFILE. If this variable is
listed it will override any other method specified. If
not set the method will default to block. Inside the
hostfile must contain at minimum the number of hosts re-
quested and be one per line or comma separated. If speci-
fying a task count (-n, --ntasks=<number>), your tasks
will be laid out on the nodes in the order of the file.
NOTE: The arbitrary distribution option on a job alloca-
tion only controls the nodes to be allocated to the job
and not the allocation of CPUs on those nodes. This op-
tion is meant primarily to control a job step's task lay-
out in an existing job allocation for the srun command.
NOTE: If the number of tasks is given and a list of re-
quested nodes is also given, the number of nodes used
from that list will be reduced to match that of the num-
ber of tasks if the number of nodes in the list is
greater than the number of tasks.

Second distribution method (distribution of CPUs across sockets
for binding):

* Use the default method for distributing CPUs across sock-
ets (cyclic).

block The block distribution method will distribute allocated
CPUs consecutively from the same socket for binding to
tasks, before using the next consecutive socket.

cyclic The cyclic distribution method will distribute allocated
CPUs for binding to a given task consecutively from the
same socket, and from the next consecutive socket for the
next task, in a round-robin fashion across sockets.
Tasks requiring more than one CPU will have all of those
CPUs allocated on a single socket if possible.
NOTE: In nodes with hyper-threading enabled, a task not
requesting full cores may be distributed across sockets.
This can be avoided by specifying --ntasks-per-core=1,
which forces tasks to allocate full cores.

fcyclic
The fcyclic distribution method will distribute allocated
CPUs for binding to tasks from consecutive sockets in a
round-robin fashion across the sockets. Tasks requiring
more than one CPU will have each CPUs allocated in a
cyclic fashion across sockets.

Third distribution method (distribution of CPUs across cores for
binding):

* Use the default method for distributing CPUs across cores
(inherited from second distribution method).

block The block distribution method will distribute allocated
CPUs consecutively from the same core for binding to
tasks, before using the next consecutive core.

cyclic The cyclic distribution method will distribute allocated
CPUs for binding to a given task consecutively from the
same core, and from the next consecutive core for the
next task, in a round-robin fashion across cores.

fcyclic
The fcyclic distribution method will distribute allocated
CPUs for binding to tasks from consecutive cores in a
round-robin fashion across the cores.

Optional control for task distribution over nodes:

Pack Rather than evenly distributing a job step's tasks evenly
across its allocated nodes, pack them as tightly as pos-
sible on the nodes. This only applies when the "block"
task distribution method is used.

NoPack Rather than packing a job step's tasks as tightly as pos-
sible on the nodes, distribute them evenly. This user
option will supersede the SelectTypeParameters
CR_Pack_Nodes configuration parameter.

-x, --exclude=<node_name_list>
Explicitly exclude certain nodes from the resources granted to
the job.

--exclusive[={user|mcs|topo}]
The job allocation can not share nodes (or topology segment
with the "=topo") with other running jobs (or just other users
with the "=user" option or with the "=mcs" option). If
user/mcsi/topo are not specified (i.e. the job allocation can
not share nodes with other running jobs), the job is allocated
all CPUs and GRES on all nodes in the allocation, but is only
allocated as much memory as it requested. 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. The
default shared/exclusive behavior depends on system configura-
tion and the partition's OverSubscribe option takes precedence
over the job's option. NOTE: Since shared GRES (MPS) cannot be
allocated at the same time as a sharing GRES (GPU) this option
only allocates all sharing GRES and no underlying shared GRES.

NOTE: This option is mutually exclusive with --oversubscribe.

--extra=<string>
An arbitrary string enclosed in single or double quotes if using
spaces or some special characters.

If SchedulerParameters=extra_constraints is enabled, this string
is used for node filtering based on the Extra field in each
node.

-B, --extra-node-info=<sockets>[:cores[:threads]]
Restrict node selection to nodes with at least the specified
number of sockets, cores per socket and/or threads per core.
NOTE: These options do not specify the resource allocation size.
Each value specified is considered a minimum. An asterisk (*)
can be used as a placeholder indicating that all available re-
sources of that type are to be utilized. Values can also be
specified as min-max. The individual levels can also be speci-
fied in separate options if desired:
--sockets-per-node=<sockets>
--cores-per-socket=<cores>
--threads-per-core=<threads>
If task/affinity plugin is enabled, then specifying an alloca-
tion in this manner also results in subsequently launched tasks
being bound to threads if the -B option specifies a thread
count, otherwise an option of cores if a core count is speci-
fied, otherwise an option of sockets. If SelectType is config-
ured to select/cons_tres, it must have a parameter of CR_Core,
CR_Core_Memory, CR_Socket, or CR_Socket_Memory for this option
to be honored. If not specified, the scontrol show job will
display 'ReqS:C:T=*:*:*'. This option applies to job alloca-
tions.
NOTE: This option is mutually exclusive with --hint,
--threads-per-core and --ntasks-per-core.
NOTE: This option may implicitly set the number of tasks (if -n
was not specified) as one task per requested thread.

--gpu-bind=[verbose,]<type>
Equivalent to --tres-bind=gres/gpu:[verbose,]<type> See
--tres-bind for all options and documentation.

--gpu-freq=[<type]=value>[,<type=value>][,verbose]
Request that GPUs allocated to the job are configured with spe-
cific frequency values. This option can be used to indepen-
dently configure the GPU and its memory frequencies. After the
job is completed, the frequencies of all affected GPUs will be
reset to the highest possible values. In some cases, system
power caps may override the requested 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 speci-
fied numeric value is not possible, a value as close as possible
will be used. See below for definition of the values. The ver-
bose option causes current GPU frequency information to be
logged. Examples of use include "--gpu-freq=medium,memory=high"
and "--gpu-freq=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.

-G, --gpus=[type:]<number>
Specify the total number of GPUs required for the job. An op-
tional GPU type specification can be supplied. For example
"--gpus=volta:3". See also the --gpus-per-node,
--gpus-per-socket and --gpus-per-task options.
NOTE: The allocation has to contain at least one GPU per node,
or one of each GPU type per node if types are used. Use hetero-
geneous jobs if different nodes need different GPU types.

--gpus-per-node=[type:]<number>
Specify the number of GPUs required for the job on each node in-
cluded in the job's resource allocation. An optional GPU type
specification can be supplied. For example
"--gpus-per-node=volta:3". Multiple options can be requested in
a comma separated list, for example:
"--gpus-per-node=volta:3,kepler:1". See also the --gpus,
--gpus-per-socket and --gpus-per-task options.

--gpus-per-socket=[type:]<number>
Specify the number of GPUs required for the job on each socket
included in the job's resource allocation. An optional GPU type
specification can be supplied. For example
"--gpus-per-socket=volta:3". Multiple options can be requested
in a comma separated list, for example:
"--gpus-per-socket=volta:3,kepler:1". Requires job to specify a
sockets per node count ( --sockets-per-node). See also the
--gpus, --gpus-per-node and --gpus-per-task options.

--gpus-per-task=[type:]<number>
Specify the number of GPUs required for the job on each task to
be spawned in the job's resource allocation. An optional GPU
type specification can be supplied. For example
"--gpus-per-task=volta:1". Multiple options can be requested in
a comma separated list, for example:
"--gpus-per-task=volta:3,kepler:1". See also the --gpus,
--gpus-per-socket and --gpus-per-node options. This option re-
quires an explicit task count, e.g. -n, --ntasks or "--gpus=X
--gpus-per-task=Y" rather than an ambiguous range of nodes with
-N, --nodes. This option will implicitly set
--tres-bind=gres/gpu:per_task:<gpus_per_task>, or if multiple
gpu types are specified
--tres-bind=gres/gpu:per_task:<gpus_per_task_type_sum>. However,
that can be overridden with an explicit --tres-bind=gres/gpu
specification.

--gres=<list>
Specifies a comma-delimited list of generic consumable resources
requested per node. The format for each entry in the list is
"name[[:type]:count]". The name is the type of consumable re-
source (e.g. gpu). The type is an optional classification for
the resource (e.g. a100). The count is the number of those re-
sources with a default value of 1. The count can have a suffix
of "k" or "K" (multiple of 1024), "m" or "M" (multiple of 1024 x
1024), "g" or "G" (multiple of 1024 x 1024 x 1024), "t" or "T"
(multiple of 1024 x 1024 x 1024 x 1024), "p" or "P" (multiple of
1024 x 1024 x 1024 x 1024 x 1024). The specified resources will
be allocated to the job on each node. The available generic
consumable resources is configurable by the system administra-
tor. A list of available generic consumable resources will be
printed and the command will exit if the option argument is
"help". Examples of use include "--gres=gpu:2", "--gres=gpu:ke-
pler:2", and "--gres=help".

--gres-flags=<type>
Specify generic resource task binding options.

multiple-tasks-per-sharing
Negate one-task-per-sharing. This is useful if it is set
by default in SelectTypeParameters.

disable-binding
Negate enforce-binding. This is useful if it is set by
default in SelectTypeParameters.

enforce-binding
The only CPUs available to the job will be those bound to
the selected GRES (i.e. the CPUs identified in the
gres.conf file will be strictly enforced). This option
may result in delayed initiation of a job. For example a
job requiring two GPUs and one CPU will be delayed until
both GPUs on a single socket are available rather than
using GPUs bound to separate sockets, however, the appli-
cation performance may be improved due to improved commu-
nication speed. Requires the node to be configured with
more than one socket and resource filtering will be per-
formed on a per-socket basis.
NOTE: This option can be set by default in SelectTypePa-
rameters.
NOTE: This option is specific to SelectType=cons_tres.
NOTE: This option can give undefined results if attempt-
ing to enforce binding on multiple gres on multiple sock-
ets.

one-task-per-sharing
Do not allow different tasks in to be allocated shared
gres from the same sharing gres.
NOTE: This flag is only enforced if shared gres are re-
quested with --tres-per-task.
NOTE: This option can be set by default with SelectType-
Parameters=ONE_TASK_PER_SHARING_GRES.
NOTE: This option is specific to SelectTypeParame-
ters=MULTIPLE_SHARING_GRES_PJ

-h, --help
Display help information and exit.

--hint=<type>
Bind tasks according to application hints.
NOTE: This option implies specific values for certain related
options, which prevents its use with any user-specified values
for --ntasks-per-core, --cores-per-socket, --sockets-per-node,
--threads-per-core or -B. These conflicting options will over-
ride --hint when specified as command line arguments. If a con-
flicting option is specified as an environment variable, --hint
as a command line argument will take precedence.

compute_bound
Select settings for compute bound applications: use all
cores in each socket, one thread per core.

memory_bound
Select settings for memory bound applications: use only
one core in each socket, one thread per core.

multithread
Use extra threads with in-core multi-threading which can
benefit communication intensive applications. Only sup-
ported with the task/affinity plugin.

nomultithread
Don't use extra threads with in-core multi-threading; re-
stricts tasks to one thread per core. Only supported
with the task/affinity plugin.

help show this help message

-H, --hold
Specify the job is to be submitted in a held state (priority of
zero). A held job can now be released using scontrol to reset
its priority (e.g. "scontrol release <job_id>").

-I, --immediate[=<seconds>]
exit if resources are not available within the time period spec-
ified. If no argument is given (seconds defaults to 1), re-
sources must be available immediately for the request to suc-
ceed. If defer is configured in SchedulerParameters and sec-
onds=1 the allocation request will fail immediately; defer con-
flicts and takes precedence over this option. By default, --im-
mediate is off, and the command will block until resources be-
come available. Since this option's argument is optional, for
proper parsing the single letter option must be followed immedi-
ately with the value and not include a space between them. For
example "-I60" and not "-I 60".

-J, --job-name=<jobname>
Specify a name for the job allocation. The specified name will
appear along with the job id number when querying running jobs
on the system. The default job name is the name of the "command"
specified on the command line.

-K, --kill-command[=signal]
salloc always runs a user-specified command once the allocation
is granted. salloc will wait indefinitely for that command to
exit. If you specify the --kill-command option salloc will send
a signal to your command any time that the Slurm controller
tells salloc that its job allocation has been revoked. The job
allocation can be revoked for a couple of reasons: someone used
scancel to revoke the allocation, or the allocation reached its
time limit. If you do not specify a signal name or number and
Slurm is configured to signal the spawned command at job termi-
nation, the default signal is SIGHUP for interactive and SIGTERM
for non-interactive sessions. Since this option's argument is
optional, for proper parsing the single letter option must be
followed immediately with the value and not include a space be-
tween them. For example "-K1" and not "-K 1".

-L, --licenses=<license>[@db][:count][,license[@db][:count]...]
Specification of licenses (or other resources available on all
nodes of the cluster) which must be allocated to this job. Li-
cense names can be followed by a colon and count (the default
count is one). Multiple licenses can be requested. If they are
separated by a comma (',' meaning AND), then all requested li-
censes are required for the job. For example, "--li-
censes=foo:4,bar". If they are separated by a pipe ('|' meaning
OR), then only one of the license requests are required for the
job. For example, "--licenses=foo:4|bar". AND and OR cannot both
be used.

NOTE: When submitting heterogeneous jobs, license requests may
only be made on the first component job. For example "salloc -L
ansys:2 :".

NOTE: If licenses are tracked in AccountingStorageTres and OR is
used, ReqTRES will display all requested tres separated by com-
mas. AllocTRES will display only the license that was allocated
to the job.

NOTE: When a job requests OR'd licenses, Slurm will attempt to
allocate the licenses in the order in which they are requested.
This specified order will take precedence even if the rest of
requested licenses could be satisfied on a requested reserva-
tion. This also applies to backfill planning when SchedulerPara-
meters=bf_licenses is configured.

--mail-type=<type>
Notify user by email when certain event types occur. Valid type
values are NONE, BEGIN, END, FAIL, REQUEUE, ALL (equivalent to
BEGIN, END, FAIL, INVALID_DEPEND, REQUEUE, and STAGE_OUT), IN-
VALID_DEPEND (dependency never satisfied), STAGE_OUT (burst
buffer stage out and teardown completed), TIME_LIMIT,
TIME_LIMIT_90 (reached 90 percent of time limit), TIME_LIMIT_80
(reached 80 percent of time limit), and TIME_LIMIT_50 (reached
50 percent of time limit). Multiple type values may be speci-
fied in a comma separated list. NONE will suppress all event
notifications, ignoring any other values specified. By default
no email notifications are sent. The user to be notified is in-
dicated with --mail-user.

--mail-user=<user>
User to receive email notification of state changes as defined
by --mail-type. This may be a full email address or a username.
If a username is specified, the value from MailDomain in
slurm.conf will be appended to create an email address. The de-
fault value is the submitting user.

--mcs-label=<mcs>
Used only when a compatible MCSPlugin is enabled. This parameter
is a group that the user belongs to (mcs/group) or an arbitrary
label string (mcs/label). In both cases, no label will be as-
signed by default. Refer to the MCS documentation for more de-
tails: <https://slurm.schedmd.com/mcs.html>

--mem=<size>[units]
Specify the real memory required per node. Default units are
megabytes. Different units can be specified using the suffix
[K|M|G|T]. Default value is DefMemPerNode and the maximum value
is MaxMemPerNode. If configured, both of parameters can be seen
using the scontrol show config command. This parameter would
generally be used if whole nodes are allocated to jobs (Select-
Type=select/linear). Also see --mem-per-cpu and --mem-per-gpu.
The --mem, --mem-per-cpu and --mem-per-gpu options are mutually
exclusive. If --mem, --mem-per-cpu or --mem-per-gpu are speci-
fied as command line arguments, then they will take precedence
over the environment.

NOTE: A memory size specification of zero is treated as a spe-
cial case and grants the job access to all of the memory on each
node.

NOTE: The memory used by each slurmstepd process is included in
the job's total memory usage. It typically consumes between
20MiB and 200MiB, though this can vary depending on system con-
figuration and any loaded plugins.

NOTE: Memory requests will not be strictly enforced unless Slurm
is configured to use an enforcement mechanism. See ConstrainRAM-
Space in the cgroup.conf(5) man page and OverMemoryKill in the
slurm.conf(5) man page for more details.

--mem-bind=[{quiet|verbose},]<type>
Bind tasks to memory. Used only when the task/affinity plugin is
enabled and the NUMA memory functions are available. Note that
the resolution of CPU and memory binding may differ on some ar-
chitectures. For example, CPU binding may be performed at the
level of the cores within a processor while memory binding will
be performed at the level of nodes, where the definition of
"nodes" may differ from system to system. By default no memory
binding is performed; any task using any CPU can use any memory.
This option is typically used to ensure that each task is bound
to the memory closest to its assigned CPU. The use of any type
other than "none" or "local" is not recommended.

NOTE: To have Slurm always report on the selected memory binding
for all commands executed in a shell, you can enable verbose
mode by setting the SLURM_MEM_BIND environment variable value to
"verbose".

The following informational environment variables are set when
--mem-bind is in use:

SLURM_MEM_BIND_LIST
SLURM_MEM_BIND_PREFER
SLURM_MEM_BIND_TYPE
SLURM_MEM_BIND_VERBOSE

See the ENVIRONMENT VARIABLES section for a more detailed de-
scription of the individual SLURM_MEM_BIND* variables.

Supported options include:

help show this help message

local Use memory local to the processor in use

map_mem:<list>
Bind by setting memory masks on tasks (or ranks) as spec-
ified where <list> is
<numa_id_for_task_0>,<numa_id_for_task_1>,... The map-
ping is specified for a node and identical mapping is ap-
plied to the tasks on every node (i.e. the lowest task ID
on each node is mapped to the first ID specified in the
list, etc.). NUMA IDs are interpreted as decimal values
unless they are preceded with '0x' in which case they in-
terpreted as hexadecimal values. If the number of tasks
(or ranks) exceeds the number of elements in this list,
elements in the list will be reused as needed starting
from the beginning of the list. To simplify support for
large task counts, the lists may follow a map with an as-
terisk and repetition count. For example
"map_mem:0x0f*4,0xf0*4". For predictable binding re-
sults, all CPUs for each node in the job should be allo-
cated to the job.

mask_mem:<list>
Bind by setting memory masks on tasks (or ranks) as spec-
ified where <list> is
<numa_mask_for_task_0>,<numa_mask_for_task_1>,... The
mapping is specified for a node and identical mapping is
applied to the tasks on every node (i.e. the lowest task
ID on each node is mapped to the first mask specified in
the list, etc.). NUMA masks are always interpreted as
hexadecimal values. Note that masks must be preceded
with a '0x' if they don't begin with [0-9] so they are
seen as numerical values. If the number of tasks (or
ranks) exceeds the number of elements in this list, ele-
ments in the list will be reused as needed starting from
the beginning of the list. To simplify support for large
task counts, the lists may follow a mask with an asterisk
and repetition count. For example "mask_mem:0*4,1*4".
For predictable binding results, all CPUs for each node
in the job should be allocated to the job.

no[ne] don't bind tasks to memory (default)

p[refer]
Prefer use of first specified NUMA node, but permit
use of other available NUMA nodes.

q[uiet]
quietly bind before task runs (default)

rank bind by task rank (not recommended)

v[erbose]
verbosely report binding before task runs

--mem-per-cpu=<size>[units]
Minimum memory required per usable allocated CPU. Default units
are megabytes. Different units can be specified using the suf-
fix [K|M|G|T]. The default value is DefMemPerCPU and the maxi-
mum value is MaxMemPerCPU (see exception below). If configured,
both parameters can be seen using the scontrol show config com-
mand. Note that if the job's --mem-per-cpu value exceeds the
configured MaxMemPerCPU, then the user's limit will be treated
as a memory limit per task; --mem-per-cpu will be reduced to a
value no larger than MaxMemPerCPU; --cpus-per-task will be set
and the value of --cpus-per-task multiplied by the new
--mem-per-cpu value will equal the original --mem-per-cpu value
specified by the user. This parameter would generally be used
if individual processors are allocated to jobs (SelectType=se-
lect/cons_tres). If resources are allocated by core, socket, or
whole nodes, then the number of CPUs allocated to a job may be
higher than the task count and the value of --mem-per-cpu should
be adjusted accordingly. Also see --mem and --mem-per-gpu. The
--mem, --mem-per-cpu and --mem-per-gpu options are mutually ex-
clusive.

NOTE: If the final amount of memory requested by a job can't be
satisfied by any of the nodes configured in the partition, the
job will be rejected. This could happen if --mem-per-cpu is
used with the --exclusive option for a job allocation and
--mem-per-cpu times the number of CPUs on a node is greater than
the total memory of that node.

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

--mem-per-gpu=<size>[units]
Minimum memory required per allocated GPU. Default units are
megabytes. Different units can be specified using the suffix
[K|M|G|T]. Default value is DefMemPerGPU and is available on
both a global and per partition basis. If configured, the para-
meters can be seen using the scontrol show config and scontrol
show partition commands. Also see --mem. The --mem,
--mem-per-cpu and --mem-per-gpu options are mutually exclusive.

--mincpus=<n>
Specify a minimum number of logical cpus/processors per node.

--network=<type>
Specify information pertaining to the switch or network. The
interpretation of type is system dependent. It is used to re-
quest using Network Performance Counters. Only one value per
request is valid. All options are case in-sensitive. In this
configuration supported values include:

system
Use the system-wide network performance counters. Only
nodes requested will be marked in use for the job alloca-
tion. If the job does not fill up the entire system the
rest of the nodes are not able to be used by other jobs
using NPC, if idle their state will appear as PerfCnts.
These nodes are still available for other jobs not using
NPC.

blade Use the blade network performance counters. Only nodes re-
quested will be marked in use for the job allocation. If
the job does not fill up the entire blade(s) allocated to
the job those blade(s) are not able to be used by other
jobs using NPC, if idle their state will appear as PerfC-
nts. These nodes are still available for other jobs not
using NPC.

In all cases the job allocation request must specify the --ex-
clusive option. Otherwise the request will be denied.

Also with any of these options steps are not allowed to share
blades, so resources would remain idle inside an allocation if
the step running on a blade does not take up all the nodes on
the blade.

The network option is also available on systems with HPE Sling-
shot networks. It can be used to request a job VNI (to be used
for communication between job steps in a job). It also can be
used to override the default network resources allocated for the
job step. Multiple values may be specified in a comma-separated
list.

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_LATENCY,
TC_BULK_DATA, and TC_BEST_EFFORT.

no_vni
Don't allocate any VNIs for this job (even if multi-node).

job_vni
Allocate a job VNI for this job.

single_node_vni
Allocate a job VNI for this job, even if it is a single-
node job.

adjust_limits
If set, slurmd will set an upper bound on network resource
reservations by taking the per-NIC maximum resource quan-
tity and subtracting the reserved or used values
(whichever is higher) for any system network services;
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.

disable_rdzv_get
Disable rendezvous gets in Slingshot NICs, which can im-
prove performance for certain applications.

nic_distribution_count=<val>
The number of NICs the user will evenly distribute their
tasks over. 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 limit for this resource.

depth=<depth>
Multiplier for per-CPU resource allocation. Default is
the number of reserved CPUs on the node.

The resources that may be requested are:

txqs Transmit command queues. The default is 2 per-CPU, maximum
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 options are supported:

unique-channel-per-segment
Instead of one channel for the entire job, allocate one
channel per segment in the job. This only takes effect
when topology/block is configured.

--nice[=adjustment]
Run the job with an adjusted scheduling priority within Slurm.
With no adjustment value the scheduling priority is decreased by
100. A negative nice value increases the priority, otherwise de-
creases it. The adjustment range is +/- 2147483645. Only privi-
leged users can specify a negative adjustment.

--no-bell
Silence salloc's use of the terminal bell. Also see the option
--bell.

-k, --no-kill[=off]
Do not automatically terminate a job if one of the nodes it has
been allocated fails. The user will assume the responsibilities
for fault-tolerance should a node fail. The job allocation will
not be revoked so the user may launch new job steps on the re-
maining nodes in their allocation. This option does not set the
SLURM_NO_KILL environment variable. Therefore, when a node
fails, steps running on that node will be killed unless the
SLURM_NO_KILL environment variable was explicitly set or srun
calls within the job allocation explicitly requested --no-kill.

Specify an optional argument of "off" to disable the effect of
the SALLOC_NO_KILL environment variable.

By default Slurm terminates the entire job allocation if any
node fails in its range of allocated nodes.

--no-shell
immediately exit after allocating resources, without running a
command. However, the Slurm job will still be created and will
remain active and will own the allocated resources as long as it
is active. You will have a Slurm job id with no associated
processes or tasks. You can submit srun commands against this
resource allocation, if you specify the --jobid= option with the
job id of this Slurm job. Or, this can be used to temporarily
reserve a set of resources so that other jobs cannot use them
for some period of time. (Note that the Slurm job is subject to
the normal constraints on jobs, including time limits, so that
eventually the job will terminate and the resources will be
freed, or you can terminate the job manually using the scancel
command.)

-F, --nodefile=<node_file>
Much like --nodelist, but the list is contained in a file of
name node file. The node names of the list may also span multi-
ple lines in the file. Duplicate node names in the file will be
ignored. The order of the node names in the list is not impor-
tant; the node names will be sorted by Slurm.

-w, --nodelist=<node_name_list>
Request a specific list of hosts. The job will contain all of
these hosts and possibly additional hosts as needed to satisfy
resource requirements. The list may be specified as a
comma-separated list of hosts, a range of hosts (host[1-5,7,...]
for example), or a filename. The host list will be assumed to
be a filename if it contains a "/" character. If you specify a
minimum node or processor count larger than can be satisfied by
the supplied host list, additional resources will be allocated
on other nodes as needed. Duplicate node names in the list will
be ignored. The order of the node names in the list is not im-
portant; the node names will be sorted by Slurm.

-N, --nodes=<minnodes>[-maxnodes]|<size_string>
Request that a minimum of minnodes nodes be allocated to this
job. A maximum node count may also be specified with maxnodes.
If only one number is specified, this is used as both the mini-
mum and maximum node count. Node count can be also specified as
size_string. The size_string specification identifies what
nodes values should be used. Multiple values may be specified
using a comma separated list or with a step function by suffix
containing a colon and number values with a "-" separator. For
example, "--nodes=1-15:4" is equivalent to "--nodes=1,5,9,13".
The partition's node limits supersede those of the job. If a
job's node limits are outside of the range permitted for its as-
sociated partition, the job will be left in a PENDING state.
This permits possible execution at a later time, when the parti-
tion limit is changed. If a job node limit exceeds the number
of nodes configured in the partition, the job will be rejected.
Note that the environment variable SLURM_JOB_NUM_NODES will be
set to the count of nodes actually allocated to the job. See the
ENVIRONMENT VARIABLES section for more information. If -N is
not specified, the default behavior is to allocate enough nodes
to satisfy the requested resources as expressed by per-job spec-
ification options, e.g. -n, -c and --gpus. The job will be al-
located as many nodes as possible within the range specified and
without delaying the initiation of the job. The node count
specification may include a numeric value followed by a suffix
of "k" (multiplies numeric value by 1,024) or "m" (multiplies
numeric value by 1,048,576).

NOTE: This option cannot be used in with arbitrary distribution.

-n, --ntasks=<number>
salloc does not launch tasks, it requests an allocation of re-
sources and executed some command. This option advises the Slurm
controller that job steps run within this allocation will launch
a maximum of number tasks and sufficient resources are allocated
to accomplish this. The default is one task per node, but note
that the --cpus-per-task option will change this default.

--ntasks-per-core=<ntasks>
Request the maximum ntasks be invoked on each core. Meant to be
used with the --ntasks option. Related to --ntasks-per-node ex-
cept at the core level instead of the node level. This option
will be inhertited by srun. Slurm may allocate more cpus than
what was requested in order to respect this option.
NOTE: This option is not supported when using SelectType=se-
lect/linear. This value can not be greater than
--threads-per-core.

--ntasks-per-gpu=<ntasks>
Request that there are ntasks tasks invoked for every GPU. This
option can work in two ways: 1) either specify --ntasks in addi-
tion, in which case a type-less GPU specification will be auto-
matically determined to satisfy --ntasks-per-gpu, or 2) specify
the GPUs wanted (e.g. via --gpus or --gres) without specifying
--ntasks, and the total task count will be automatically deter-
mined. The number of CPUs needed will be automatically in-
creased if necessary to allow for any calculated task count.
This option will implicitly set --tres-bind=gres/gpu:sin-
gle:<ntasks>, but that can be overridden with an explicit
--tres-bind=gres/gpu specification. This option is not compati-
ble with a node range (i.e. -N<minnodes-maxnodes>). This option
is not compatible with --gpus-per-task, --gpus-per-socket, or
--ntasks-per-node. This option is not supported unless Select-
Type=cons_tres is configured (either directly or indirectly on
Cray systems).

--ntasks-per-node=<ntasks>
Request that ntasks be invoked on each node. If used with the
--ntasks option, the --ntasks option will take precedence and
the --ntasks-per-node will be treated as a maximum count of
tasks per node. Meant to be used with the --nodes option. This
is related to --cpus-per-task=ncpus, but does not require knowl-
edge of the actual number of cpus on each node. In some cases,
it is more convenient to be able to request that no more than a
specific number of tasks be invoked on each node. Examples of
this include submitting a hybrid MPI/OpenMP app where only one
MPI "task/rank" should be assigned to each node while allowing
the OpenMP portion to utilize all of the parallelism present in
the node, or submitting a single setup/cleanup/monitoring job to
each node of a pre-existing allocation as one step in a larger
job script.

--ntasks-per-socket=<ntasks>
Request the maximum ntasks be invoked on each socket. Meant to
be used with the --ntasks option. Related to --ntasks-per-node
except at the socket level instead of the node level. NOTE:
This option is not supported when using SelectType=select/lin-
ear.

--oom-kill-step[={0|1}]
Whether to kill the entire step if an OOM event is detected in
any task of a step. This overwrites the "OOMKillStep" setting in
TaskPluginParam from slurm.conf. When unset it will use the set-
ting in slurm.conf. When set, a value of "0" will disable
killing the entire step, while a value of "1" will enable it.
This applies to the entire allocation except for the external
step. Default is "1" (enabled) when the option is found with no
value.

-O, --overcommit
Overcommit resources.

When applied to a job allocation (not including jobs requesting
exclusive access to the nodes) the resources are allocated as if
only one task per node is requested. This means that the re-
quested number of cpus per task (-c, --cpus-per-task) are allo-
cated per node rather than being multiplied by the number of
tasks. Options used to specify the number of tasks per node,
socket, core, etc. are ignored.

When applied to job step allocations (the srun command when exe-
cuted within an existing job allocation), this option can be
used to launch more than one task per CPU. Normally, srun will
not allocate more than one process per CPU. By specifying
--overcommit you are explicitly allowing more than one process
per CPU. However no more than MAX_TASKS_PER_NODE tasks are per-
mitted to execute per node. NOTE: MAX_TASKS_PER_NODE is defined
in the file slurm.h and is not a variable, it is set at Slurm
build time.

-s, --oversubscribe
The job allocation can over-subscribe resources with other run-
ning jobs. The resources to be over-subscribed can be nodes,
sockets, cores, and/or hyperthreads depending upon configura-
tion. The default over-subscribe behavior depends on system
configuration and the partition's OverSubscribe option takes
precedence over the job's option. This option may result in the
allocation being granted sooner than if the --oversubscribe op-
tion was not set and allow higher system utilization, but appli-
cation performance will likely suffer due to competition for re-
sources. Also see the --exclusive option.

NOTE: This option is mutually exclusive with --exclusive.

-p, --partition=<partition_names>
Request a specific partition for the resource allocation. If not
specified, the default behavior is to allow the slurm controller
to select the default partition as designated by the system ad-
ministrator. If the job can use more than one partition, specify
their names in a comma separate list and the one offering earli-
est initiation will be used with no regard given to the parti-
tion name ordering (although higher priority partitions will be
considered first). When the job is initiated, the name of the
partition used will be placed first in the job record partition
string.

--prefer=<list>
Nodes can have features assigned to them by the Slurm adminis-
trator. Users can specify which of these features are desired
but not required by their job using the prefer option. This op-
tion operates independently from --constraint and will override
whatever is set there if possible. When scheduling, the fea-
tures in --prefer are tried first. If a node set isn't available
with those features then --constraint is attempted. See --con-
straint for more information, this option behaves the same way.

--priority=<value>
Request a specific job priority. May be subject to configura-
tion specific constraints. value should either be a numeric
value or "TOP" (for highest possible value). Only Slurm opera-
tors and administrators can set the priority of a job.

--profile={all|none|<type>[,<type>...]}
Enables detailed data collection by the acct_gather_profile plu-
gin. Detailed data are typically time-series that are stored in
an HDF5 file for the job or an InfluxDB database depending on
the configured plugin.

All All data types are collected. (Cannot be combined with
other values.)

None No data types are collected. This is the default.
(Cannot be combined with other values.)

Valid type values are:

Energy Energy data is collected.

Task Task (I/O, Memory, ...) data is collected.

Lustre Lustre data is collected.

Network
Network (InfiniBand) data is collected.

-q, --qos=<qos>
Request a quality of service for the job, or comma separated
list of QOS. If requesting a list it will be ordered based on
the priority of the QOS given with the first being the highest
priority. QOS values can be defined for each user/cluster/ac-
count association in the Slurm database. Users will be limited
to their association's defined set of qos's when the Slurm con-
figuration parameter, AccountingStorageEnforce, includes "qos"
in its definition.

-Q, --quiet
Suppress informational messages from salloc. Errors will still
be displayed.

--reboot
Force the allocated nodes to reboot before starting the job.
This is only supported with some system configurations and will
otherwise be silently ignored. Only root, SlurmUser or admins
can reboot nodes.

--reservation=<reservation_names>
Allocate resources for the job from the named reservation. If
the job can use more than one reservation, specify their names
in a comma separate list and the one offering earliest initia-
tion. Each reservation will be considered in the order it was
requested. All reservations will be listed in scontrol/squeue
through the life of the job. In accounting the first reserva-
tion will be seen and after the job starts the reservation used
will replace it.

--resources=<resource_names>
Specification of hierarchical resources which must be allocated
to this job. Resources names can be followed by a colon and
count (the default count is one). Multiple resources in Mode 1
and Mode 2 can be requested in a comma separated list but only
one of Mode 3 can be requested. For example, "--re-
sources=flat:2,natural:1".

See https://slurm.schedmd.com/hres.html for more information on
use of Hierarchical Resource with Slurm.

--resv-ports[=count]
Reserve communication ports for this job. Users can specify the
number of port they want to reserve. The parameter Mpi-
Params=ports=12000-12999 must be specified in slurm.conf. If the
number of reserved ports is zero then no ports are reserved.
Used for native Cray's PMI only. This option can only be used
if the slurmstepd step management is enabled. This option ap-
plies to job allocations. See --stepmgr.

--segment=<segment_size>
When a block topology is used, this defines the size of the seg-
ments that will be used to create the job allocation. No re-
quirement would be placed on all segments for a job needing to
be placed within the same higher-level block.

NOTE: The requested node count must always be evenly divisible
by the requested segment size.

NOTE: When used in conjunction with --nodelist=<node_list>: The
requested node count must be less than or equal to the total
number of unique nodes specified in the --nodelist argument.
Requesting more nodes than available unique nodes in the pro-
vided --nodelist will result in the job being rejected by slurm-
ctld.

--signal=[R:]<sig_num>[@sig_time]
When a job is within sig_time seconds of its end time, send it
the signal sig_num. Due to the resolution of event handling by
Slurm, the signal may be sent up to 60 seconds earlier than
specified. sig_num may either be a signal number or name (e.g.
"10" or "USR1"). sig_time must have an integer value between 0
and 65535. By default, no signal is sent before the job's end
time. If a sig_num is specified without any sig_time, the de-
fault time will be 60 seconds. Use the "R:" option to allow
this job to overlap with a reservation with MaxStartDelay set.
If the "R:" option is used, preemption must be enabled on the
system, and if the job is preempted it will be requeued if al-
lowed otherwise the job will be canceled. To have the signal
sent at preemption time see the send_user_signal PreemptParame-
ter.

--sockets-per-node=<sockets>
Restrict node selection to nodes with at least the specified
number of sockets. See additional information under -B option
above when task/affinity plugin is enabled.
NOTE: This option may implicitly set the number of tasks (if -n
was not specified) as one task per requested thread.

--spread-job
Spread the job allocation over as many nodes as possible and at-
tempt to evenly distribute tasks across the allocated nodes.
This option disables the topology/tree plugin.

--spread-segments
Prevent nodes within the same base block from being allocated to
separate segments within the same block.

This option applies to job allocations. NOTE: This option will
only work with the topology/block plugin.

--stepmgr
Enable slurmstepd step management per-job if it isn't enabled
system wide. This enables job steps to be managed by a single
extern slurmstepd associated with the job to manage steps. This
is beneficial for jobs that submit many steps inside their allo-
cations. PrologFlags=contain must be set.

--switches=<count>[@max-time]
When a tree topology is used, this defines the maximum count of
leaf switches desired for the job allocation and optionally the
maximum time to wait for that number of switches. If Slurm finds
an allocation containing more switches than the count specified,
the job remains pending until it either finds an allocation with
desired switch count or the time limit expires. It there is no
switch count limit, there is no delay in starting the job. Ac-
ceptable time formats include "minutes", "minutes:seconds",
"hours:minutes:seconds", "days-hours", "days-hours:minutes" and
"days-hours:minutes:seconds". The job's maximum time delay may
be limited by the system administrator using the SchedulerPara-
meters configuration parameter with the max_switch_wait parame-
ter option. On a dragonfly network the only switch count sup-
ported is 1 since communication performance will be highest when
a job is allocate resources on one leaf switch or more than 2
leaf switches. The default max-time is the max_switch_wait
SchedulerParameters.

--thread-spec=<num>
Count of specialized threads per node reserved by the job for
system operations and not used by the application. The applica-
tion will not use these threads, but will be charged for their
allocation. This option can not be used with the --core-spec
option.

NOTE: Explicitly setting a job's specialized thread value im-
plicitly sets its --exclusive option, reserving entire nodes for
the job.

--threads-per-core=<threads>
Restrict node selection to nodes with at least the specified
number of threads per core. In task layout, use the specified
maximum number of threads per core. NOTE: "Threads" refers to
the number of processing units on each core rather than the num-
ber of application tasks to be launched per core. See addi-
tional information under -B option above when task/affinity plu-
gin is enabled.
NOTE: This option may implicitly set the number of tasks (if -n
was not specified) as one task per requested thread.

-t, --time=<time>
Set a limit on the total run time of the job allocation. If the
requested time limit exceeds the partition's time limit, the job
will be left in a PENDING state (possibly indefinitely). The de-
fault time limit is the partition's default time limit. When the
time limit is reached, each task in each job step is sent
SIGTERM followed by SIGKILL. The interval between signals is
specified by the Slurm configuration parameter KillWait. The
OverTimeLimit configuration parameter may permit the job to run
longer than scheduled. Time resolution is one minute and second
values are rounded up to the next minute.

A time limit of zero requests that no time limit be imposed. Ac-
ceptable time formats include "minutes", "minutes:seconds",
"hours:minutes:seconds", "days-hours", "days-hours:minutes" and
"days-hours:minutes:seconds".

--time-min=<time>
Set a minimum time limit on the job allocation. If specified,
the job may have its --time limit lowered to a value no lower
than --time-min if doing so permits the job to begin execution
earlier than otherwise possible. The job's time limit will not
be changed after the job is allocated resources. This is per-
formed by a backfill scheduling algorithm to allocate resources
otherwise reserved for higher priority jobs. Acceptable time
formats include "minutes", "minutes:seconds", "hours:min-
utes:seconds", "days-hours", "days-hours:minutes" and
"days-hours:minutes:seconds".

--tmp=<size>[units]
Specify a minimum amount of temporary disk space per node. De-
fault units are megabytes. Different units can be specified us-
ing the suffix [K|M|G|T].

--tres-bind=<tres>:[verbose,]<type>[+<tres>:
[verbose,]<type>...] Specify a list of tres with their task
binding options. Currently gres are the only supported tres for
this options. Specify gres as "gres/<gres_name>" (e.g. gres/gpu)

Example: --tres-bind=gres/gpu:verbose,map:0,1,2,3+gres/nic:clos-
est

By default, most tres are not bound to individual tasks

Supported binding type options for gres:

closest Bind each task to the gres(s) which are closest. In a
NUMA environment, each task may be bound to more than
one gres (i.e. all gres in that NUMA environment).

map:<list>
Bind by setting gres masks on tasks (or ranks) as
specified where <list> is
<gres_id_for_task_0>,<gres_id_for_task_1>,... gres IDs
are interpreted as decimal values. If the number of
tasks (or ranks) exceeds the number of elements in
this list, elements in the list will be reused as
needed starting from the beginning of the list. To
simplify support for large task counts, the lists may
follow a map with an asterisk and repetition count.
For example "map:0*4,1*4". If the task/cgroup plugin
is used and ConstrainDevices is set in cgroup.conf,
then the gres IDs are zero-based indexes relative to
the gress allocated to the job (e.g. the first gres is
0, even if the global ID is 3). Otherwise, the gres
IDs are global IDs, and all gres on each node in the
job should be allocated for predictable binding re-
sults.

mask:<list>
Bind by setting gres masks on tasks (or ranks) as
specified where <list> is
<gres_mask_for_task_0>,<gres_mask_for_task_1>,... The
mapping is specified for a node and identical mapping
is applied to the tasks on every node (i.e. the lowest
task ID on each node is mapped to the first mask spec-
ified in the list, etc.). gres masks are always inter-
preted as hexadecimal values but can be preceded with
an optional '0x'. To simplify support for large task
counts, the lists may follow a map with an asterisk
and repetition count. For example
"mask:0x0f*4,0xf0*4". If the task/cgroup plugin is
used and ConstrainDevices is set in cgroup.conf, then
the gres IDs are zero-based indexes relative to the
gres allocated to the job (e.g. the first gres is 0,
even if the global ID is 3). Otherwise, the gres IDs
are global IDs, and all gres on each node in the job
should be allocated for predictable binding results.

none Do not bind tasks to this gres (turns off implicit
binding from --tres-per-task and --gpus-per-task).

per_task:<gres_per_task>
Each task will be bound to the number of gres speci-
fied in <gres_per_task>. Tasks are preferentially as-
signed gres with affinity to cores in their allocation
like in closest, though they will take any gres if
they are unavailable. If no affinity exists, the first
task will be assigned the first x number of gres on
the node etc. Shared gres will prefer to bind one
sharing device per task if possible.

single:<tasks_per_gres>
Like closest, except that each task can only be bound
to a single gres, even when it can be bound to multi-
ple gres that are equally close. The gres to bind to
is determined by <tasks_per_gres>, where the first
<tasks_per_gres> tasks are bound to the first gres
available, the second <tasks_per_gres> tasks are bound
to the second gres available, etc. This is basically
a block distribution of tasks onto available gres,
where the available gres are determined by the socket
affinity of the task and the socket affinity of the
gres as specified in gres.conf's Cores parameter.

NOTE: Shared gres binding is currently limited to
per_task or none

--tres-per-task=<list>
Specifies a comma-delimited list of trackable resources required
for the job on each task to be spawned in the job's resource al-
location. The format for each entry in the list is
"trestype[/tresname]=count". The trestype is the type of track-
able resource requested (e.g. cpu, gres, license, etc). The
tresname is the name of the trackable resource, as can be seen
with sacctmgr show tres. This is required when it exists for
tres types such as gres, license, etc. (e.g. gpu, gpu:a100). In
order to request a license with this option, the license(s) must
be defined in the AccountingStorageTRES parameter of slurm.conf.
The count is the number of those resources.
The count can have a suffix of
"k" or "K" (multiple of 1024),
"m" or "M" (multiple of 1024 x 1024),
"g" or "G" (multiple of 1024 x 1024 x 1024),
"t" or "T" (multiple of 1024 x 1024 x 1024 x 1024),
"p" or "P" (multiple of 1024 x 1024 x 1024 x 1024 x 1024).
Examples:
--tres-per-task=cpu=4
--tres-per-task=cpu=8,license/ansys=1
--tres-per-task=gres/gpu=1
--tres-per-task=gres/gpu:a100=2
The specified resources will be allocated to the job on each
node. The available trackable resources are configurable by the
system administrator.
NOTE: This option with gres/gpu or gres/shard will implicitly
set --tres-bind=gres/[gpu|shard]:per_task:<tres_per_task>, or if
multiple gpu types are specified
--tres-bind=gres/gpu:per_task:<gpus_per_task_type_sum>. This
can be overridden with an explicit --tres-bind specification.
NOTE: Invalid TRES for --tres-per-task include bb,billing,en-
ergy,fs,mem,node,pages,vmem.

--usage
Display brief help message and exit.

--use-min-nodes
If a range of node counts is given, prefer the smaller count.

-v, --verbose
Increase the verbosity of salloc's informational messages. Mul-
tiple errors will be displayed.

-V, --version
Display version information and exit.

--wait-all-nodes=<value>
Controls when the execution of the command begins with respect
to when nodes are ready for use (i.e. booted). By default, the
salloc command will return as soon as the allocation is made.
This default can be altered using the salloc_wait_nodes option
to the SchedulerParameters parameter in the slurm.conf file.

0 Begin execution as soon as allocation can be made. Do not
wait for all nodes to be ready for use (i.e. booted).

1 Do not begin execution until all nodes are ready for use.

--wckey=<wckey>
Specify wckey to be used with job. If TrackWCKey=no (default) in
the slurm.conf this value is ignored.

--x11[={all|first|last}]
Sets up X11 forwarding on "all", "first" or "last" node(s) of
the allocation. This option is only enabled if Slurm was com-
piled with X11 support and PrologFlags=x11 is defined in the
slurm.conf. Default is "all".

PERFORMANCE
Executing salloc sends a remote procedure call to slurmctld. If enough
calls from salloc or other Slurm client commands that send remote pro-
cedure calls to the slurmctld daemon come in at once, it can result in
a degradation of performance of the slurmctld daemon, possibly result-
ing in a denial of service.

Do not run salloc or other Slurm client commands that send remote pro-
cedure calls to slurmctld from loops in shell scripts or other pro-
grams. Ensure that programs limit calls to salloc to the minimum neces-
sary for the information you are trying to gather.

INPUT ENVIRONMENT VARIABLES
Upon startup, salloc will read and handle the options set in the fol-
lowing environment variables. The majority of these variables are set
the same way the options are set, as defined above. For flag options
that are defined to expect no argument, the option can be enabled by
setting the environment variable without a value (empty or NULL
string), the string 'yes', or a non-zero number. Any other value for
the environment variable will result in the option not being set.
There are a couple exceptions to these rules that are noted below.
NOTE: Command line options always override environment variables set-
tings.

SALLOC_ACCOUNT Same as -A, --account

SALLOC_ACCTG_FREQ Same as --acctg-freq

SALLOC_BELL Same as --bell

SALLOC_BURST_BUFFER Same as --bb

SALLOC_CLUSTERS or SLURM_CLUSTERS
Same as --clusters

SALLOC_CONSTRAINT Same as -C, --constraint

SALLOC_CONTAINER Same as --container.

SALLOC_CONTAINER_ID Same as --container-id.

SALLOC_CORE_SPEC Same as --core-spec

SALLOC_CPUS_PER_GPU Same as --cpus-per-gpu

SALLOC_DEBUG Same as -v, --verbose, when set to 1, when set to
2 gives -vv, etc.

SALLOC_DELAY_BOOT Same as --delay-boot

SALLOC_EXCLUSIVE Same as --exclusive

SALLOC_GPU_BIND Same as --gpu-bind

SALLOC_GPU_FREQ Same as --gpu-freq

SALLOC_GPUS Same as -G, --gpus

SALLOC_GPUS_PER_NODE Same as --gpus-per-node

SALLOC_GPUS_PER_TASK Same as --gpus-per-task

SALLOC_GRES Same as --gres

SALLOC_GRES_FLAGS Same as --gres-flags

SALLOC_HINT or SLURM_HINT
Same as --hint

SALLOC_IMMEDIATE Same as -I, --immediate

SALLOC_KILL_CMD Same as -K, --kill-command

SALLOC_MEM_BIND Same as --mem-bind

SALLOC_MEM_PER_CPU Same as --mem-per-cpu

SALLOC_MEM_PER_GPU Same as --mem-per-gpu

SALLOC_MEM_PER_NODE Same as --mem

SALLOC_NETWORK Same as --network

SALLOC_NO_BELL Same as --no-bell

SALLOC_NO_KILL Same as -k, --no-kill

SALLOC_OVERCOMMIT Same as -O, --overcommit

SALLOC_PARTITION Same as -p, --partition

SALLOC_POWER Same as --power

SALLOC_PROFILE Same as --profile

SALLOC_QOS Same as --qos

SALLOC_REQ_SWITCH When a tree topology is used, this defines the
maximum count of switches desired for the job al-
location and optionally the maximum time to wait
for that number of switches. See --switches.

SALLOC_RESERVATION Same as --reservation

SALLOC_SEGMENT_SIZE Same as --segment

SALLOC_SIGNAL Same as --signal

SALLOC_SPREAD_JOB Same as --spread-job

SALLOC_THREAD_SPEC Same as --thread-spec

SALLOC_THREADS_PER_CORE
Same as --threads-per-core

SALLOC_TIMELIMIT Same as -t, --time

SALLOC_TRES_BIND Same as --tres-bind

SALLOC_TRES_PER_TASK Same as --tres-per-task

SALLOC_USE_MIN_NODES Same as --use-min-nodes

SALLOC_WAIT_ALL_NODES Same as --wait-all-nodes. Must be set to 0 or 1
to disable or enable the option.

SALLOC_WAIT4SWITCH Max time waiting for requested switches. See
--switches

SALLOC_WCKEY Same as --wckey

SLURM_CONF The location of the Slurm configuration file.

SLURM_DEBUG_FLAGS Specify debug flags for salloc to use. See De-
bugFlags in the slurm.conf(5) man page for a full
list of flags. The environment variable takes
precedence over the setting in the slurm.conf.

SLURM_EXIT_ERROR Specifies the exit code generated when a Slurm
error occurs (e.g. invalid options). This can be
used by a script to distinguish application exit
codes from various Slurm error conditions. Also
see SLURM_EXIT_IMMEDIATE.

SLURM_EXIT_IMMEDIATE Specifies the exit code generated when the --im-
mediate option is used and resources are not cur-
rently available. This can be used by a script
to distinguish application exit codes from vari-
ous Slurm error conditions. Also see
SLURM_EXIT_ERROR.

OUTPUT ENVIRONMENT VARIABLES
salloc will set the following environment variables in the environment
of the executed program:

SLURM_*_HET_GROUP_#
For a heterogeneous job allocation, the environment variables
are set separately for each component.

SLURM_CLUSTER_NAME
Name of the cluster on which the job is executing.

SLURM_CONTAINER
OCI Bundle for job. Only set if --container is specified.

SLURM_CONTAINER_ID
OCI id for job. Only set if --container-id is specified.

SLURM_CPUS_PER_GPU
Number of CPUs requested per allocated GPU. Only set if the
--cpus-per-gpu option is specified.

SLURM_CPUS_PER_TASK
Number of CPUs requested per task. Only set if either the
--cpus-per-task option or the --tres-per-task=cpu=# option is
specified.

SLURM_DIST_PLANESIZE
Plane distribution size. Only set for plane distributions. See
-m, --distribution.

SLURM_DISTRIBUTION
Only set if the -m, --distribution option is specified.

SLURM_GPU_BIND
Requested binding of tasks to GPU. Only set if the --gpu-bind
option is specified.

SLURM_GPU_FREQ
Requested GPU frequency. Only set if the --gpu-freq option is
specified.

SLURM_GPUS
Number of GPUs requested. Only set if the -G, --gpus option is
specified.

SLURM_GPUS_PER_NODE
Requested GPU count per allocated node. Only set if the
--gpus-per-node option is specified.

SLURM_GPUS_PER_SOCKET
Requested GPU count per allocated socket. Only set if the
--gpus-per-socket option is specified.

SLURM_HET_SIZE
Set to count of components in heterogeneous job.

SLURM_JOB_ACCOUNT
Account name associated of the job allocation.

SLURM_JOB_CPUS_PER_NODE
Count of CPUs available to the job on the nodes in the alloca-
tion, using the format CPU_count[(xnumber_of_nodes)][,CPU_count
[(xnumber_of_nodes)] ...]. For example:
SLURM_JOB_CPUS_PER_NODE='72(x2),36' indicates that on the first
and second nodes (as listed by SLURM_JOB_NODELIST) the alloca-
tion has 72 CPUs, while the third node has 36 CPUs. NOTE: The
select/linear plugin allocates entire nodes to jobs, so the
value indicates the total count of CPUs on allocated nodes. The
select/cons_tres plugin allocates individual CPUs to jobs, so
this number indicates the number of CPUs allocated to the job.

SLURM_JOB_END_TIME
The UNIX timestamp for a job's projected end time.

SLURM_JOB_GPUS
The global GPU IDs of the GPUs allocated to this job. The GPU
IDs are not relative to any device cgroup, even if devices are
constrained with task/cgroup. Only set in batch and interactive
jobs.

SLURM_JOB_ID
The ID of the job allocation.

SLURM_JOB_LICENSES
Name and count of any license(s) requested.

SLURM_JOB_NODELIST
List of nodes allocated to the job.

SLURM_JOB_NUM_NODES
Total number of nodes in the job allocation.

SLURM_JOB_PARTITION
Name of the partition in which the job is running.

SLURM_JOB_QOS
Quality Of Service (QOS) of the job allocation.

SLURM_JOB_RESERVATION
Advanced reservation containing the job allocation, if any.

SLURM_JOB_SEGMENT_SIZE
The size of the segments that was used to create the job alloca-
tion. Only set if --segment is specified.

SLURM_JOB_START_TIME
UNIX timestamp for a job's start time.

SLURM_JOBID
The ID of the job allocation. See SLURM_JOB_ID. Included for
backwards compatibility.

SLURM_MEM_BIND
Set to value of the --mem-bind option.

SLURM_MEM_BIND_LIST
Set to bit mask used for memory binding.

SLURM_MEM_BIND_PREFER
Set to "prefer" if the --mem-bind option includes the prefer op-
tion.

SLURM_MEM_BIND_TYPE
Set to the memory binding type specified with the --mem-bind op-
tion. Possible values are "none", "rank", "map_mem:",
"mask_mem:" and "local".

SLURM_MEM_BIND_VERBOSE
Set to "verbose" if the --mem-bind option includes the verbose
option. Set to "quiet" otherwise.

SLURM_MEM_PER_CPU
Same as --mem-per-cpu

SLURM_MEM_PER_GPU
Requested memory per allocated GPU. Only set if the
--mem-per-gpu option is specified.

SLURM_MEM_PER_NODE
Same as --mem

SLURM_NETWORK
Set to the value of the --network option, if specified.

SLURM_NNODES
Total number of nodes in the job allocation. See
SLURM_JOB_NUM_NODES. Included for backwards compatibility.

SLURM_NODELIST
List of nodes allocated to the job. See SLURM_JOB_NODELIST. In-
cluded for backwards compatibility.

SLURM_NPROCS
Same as SLURM_NTASKS. Included for backwards compatibility.

SLURM_NTASKS
Set to value of the --ntasks option, if specified. Or, if any of
the --ntasks-per-* options are specified, set to the number of
tasks in the job.

NOTE: This is also an input variable for srun, so if set it will
effectively set the --ntasks option for srun when called from
the salloc shell.

SLURM_NTASKS_PER_CORE
Set to value of the --ntasks-per-core option, if specified.

SLURM_NTASKS_PER_GPU
Set to value of the --ntasks-per-gpu option, if specified.

SLURM_NTASKS_PER_NODE
Set to value of the --ntasks-per-node option, if specified.

SLURM_NTASKS_PER_SOCKET
Set to value of the --ntasks-per-socket option, if specified.

SLURM_OOMKILLSTEP
Same as --oom-kill-step

SLURM_OVERCOMMIT
Set to 1 if --overcommit was specified.

SLURM_PROFILE
Same as --profile

SLURM_SHARDS_ON_NODE
Number of GPU Shards available to the step on this node.

SLURM_SUBMIT_DIR
The directory from which salloc was invoked or, if applicable,
the directory specified by the -D, --chdir option.

SLURM_SUBMIT_HOST
The hostname of the computer from which salloc was invoked.

SLURM_TASKS_PER_NODE
Number of tasks to be initiated on each node. Values are comma
separated and in the same order as SLURM_JOB_NODELIST. If two
or more consecutive nodes are to have the same task count, that
count is followed by "(x#)" where "#" is the repetition count.
For example, "SLURM_TASKS_PER_NODE=2(x3),1" indicates that the
first three nodes will each execute two tasks and the fourth
node will execute one task.

SLURM_THREADS_PER_CORE
This is only set if --threads-per-core or SAL-
LOC_THREADS_PER_CORE were specified. The value will be set to
the value specified by --threads-per-core or SAL-
LOC_THREADS_PER_CORE. This is used by subsequent srun calls
within the job allocation.

SLURM_TRES_PER_TASK
Set to the value of --tres-per-task. If --cpus-per-task or
--gpus-per-task is specified, it is also set in
SLURM_TRES_PER_TASK as if it were specified in --tres-per-task.

SIGNALS
While salloc is waiting for a PENDING job allocation, most signals will
cause salloc to revoke the allocation request and exit.

However if the allocation has been granted and salloc has already
started the specified command, then salloc will ignore most signals.
salloc will not exit or release the allocation until the command exits.
One notable exception is SIGHUP. A SIGHUP signal will cause salloc to
release the allocation and exit without waiting for the command to fin-
ish. Another exception is SIGTERM, which will be forwarded to the
spawned process.

EXAMPLES
To get an allocation, and open a new xterm in which srun commands may
be typed interactively:

$ salloc -N16 xterm
salloc: Granted job allocation 65537
# (at this point the xterm appears, and salloc waits for xterm to exit)
salloc: Relinquishing job allocation 65537

To grab an allocation of nodes and launch a parallel application on one
command line:

$ salloc -N5 srun -n10 myprogram

To create a heterogeneous job with 3 components, each allocating a
unique set of nodes:

$ salloc -w node[2-3] : -w node4 : -w node[5-7] bash
salloc: job 32294 queued and waiting for resources
salloc: job 32294 has been allocated resources
salloc: Granted job allocation 32294

COPYING
Copyright (C) 2006-2007 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.

SEE ALSO
sinfo(1), sattach(1), sbatch(1), squeue(1), scancel(1), scontrol(1),
slurm.conf(5), sched_setaffinity (2), numa (3)

Slurm 25.11 Slurm Commands salloc(1)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=salloc&sektion=1&manpath=FreeBSD+Ports+15.0.quarterly>

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