\fBsalloc\fR [\fIOPTIONS(0)\fR...] [ : [\fIOPTIONS(N)\fR...]] [\fIcommand(0)\fR [\fIargs(0)\fR...]]

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

.SH "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 \fBsalloc\fR runs the user's default
shell.

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

\fBNOTE\fR: The salloc logic includes support to save and restore the terminal
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 &"

.SH "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.

.SH "COMMAND PATH RESOLUTION"

If provided, the command is resolved in the following order:
.br

1. If command starts with ".", then path is constructed as:
current working directory / command
.br
2. If command starts with a "/", then path is considered absolute.
.br
3. If command can be resolved through PATH. See \fBpath_resolution\fR(7).
.br
4. If command is in current working directory.
.P
Current working directory is the calling process working directory unless the
\fB\-\-chdir\fR argument is passed, which will override the current working
directory.

This can be used to override the \fIJobAcctGatherFrequency\fR parameter in
the slurm.conf file. <\fIdatatype\fR>=<\fIinterval\fR> specifies the task
sampling interval for the jobacct_gather plugin or a
sampling interval for a profiling type by the
acct_gather_profile plugin. Multiple
comma\-separated <\fIdatatype\fR>=<\fIinterval\fR> pairs
may be specified. Supported \fIdatatype\fR values are:
.RS
.TP 12
\fBtask\fR
Sampling interval for the jobacct_gather plugins and for task
profiling by the acct_gather_profile plugin.
.br
\fBNOTE\fR: This frequency is used to monitor memory usage. If memory limits
are enforced the highest frequency a user can request is what is configured in
the slurm.conf file.  It can not be disabled.
.IP

.TP
\fBenergy\fR
Sampling interval for energy profiling using the
acct_gather_energy plugin.
.IP

.TP
\fBnetwork\fR
Sampling interval for infiniband profiling using the
acct_gather_interconnect plugin.
.IP

.TP
\fBfilesystem\fR
Sampling interval for filesystem profiling using the
acct_gather_filesystem plugin.
.IP

.LP
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).
.br
Smaller (non\-zero) values have a greater impact upon job performance,
but a value of 30 seconds is not likely to be noticeable for
applications having less than 10,000 tasks.
.RE

.TP
\fB\-\-bb\fR=<\fIspec\fR>
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.
See Slurm's burst buffer guide for more information and examples:
.br
https://slurm.schedmd.com/burst_buffer.html
.IP

.TP
\fB\-\-begin\fR=<\fItime\fR>
Defer eligibility of this job allocation until the specified time.

Time may be of the form \fIHH:MM:SS\fR 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 \fImidnight\fR, \fInoon\fR, \fIfika\fR (3 PM) or
\fIteatime\fR (4 PM) and you can have a time\-of\-day suffixed
with \fIAM\fR or \fIPM\fR 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 \fIMMDDYY\fR or \fIMM/DD/YY\fR
\fIYYYY\-MM\-DD\fR. Combine date and time using the following
format \fIYYYY\-MM\-DD[THH:MM[:SS]]\fR. You can also
give times like \fInow + count time\-units\fR, where the time\-units
can be \fIseconds\fR (default), \fIminutes\fR, \fIhours\fR,
\fIdays\fR, or \fIweeks\fR and you can tell Slurm to run
the job today with the keyword \fItoday\fR and to run the
job tomorrow with the keyword \fItomorrow\fR.
The value may be changed after job submission using the
\fBscontrol\fR command.
For example:
.nf
   \-\-begin=16:00
   \-\-begin=now+1hour
   \-\-begin=now+60           (seconds by default)
   \-\-begin=2010\-01\-20T12:34:00
.fi

.RS
.PP
Notes on date/time specifications:
 \- Although the 'seconds' field of the HH:MM:SS time specification 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.
.RE

.TP
.TP
\fB\-\-cluster\-constraint\fR=<\fIlist\fR>
Specifies features that a federated cluster must have to have a sibling job
submitted to it. Slurm will attempt to submit a sibling job to a cluster if it
has at least one of the specified features.
.IP

.TP
\fB\-M\fR, \fB\-\-clusters\fR=<\fIstring\fR>
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
\(aq\fIall\fR' will query to run on all clusters.
Note that the SlurmDBD must be up for this option to work properly.
.IP

.TP
\fB\-\-comment\fR=<\fIstring\fR>
An arbitrary comment.
.IP

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

\fBNOTE\fR: Changeable features are features defined by a NodeFeatures plugin.

Supported \fB\-\-constraint\fR options include:
.IP
.PD 1
.RS
.TP
\fBSingle Name\fR
Only nodes which have the specified feature will be used.
For example, \fB\-\-constraint="intel"\fR
.IP

.TP
\fBNode Count\fR
A request can specify the number of nodes needed with some feature
by appending an asterisk and count after the feature name.
For example, \fB\-\-nodes=16 \-\-constraint="graphics*4"\fR
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
\fBOR\fR
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 allocation can have different features. For example,
\fBsalloc -N2 \-\-constraint="intel|amd"\fR can result in a job allocation
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 example,
\fBsalloc -N2 \-\-constraint="foo|bar&baz"\fR
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
allocation; these features are set as active features on the node and passed to
RebootProgram (see \fBslurm.conf\fR(5)) and the helper script (see
\fBhelpers.conf\fR(5)). In this case, the helpers plugin uses the first of
"foo" or "bar,baz" that match the two nodes in the job allocation.
.IP

.TP
\fBMatching OR\fR
If only one of a set of possible options should be used for all allocated
nodes, then use the OR operator and enclose the options within square brackets.
For example, \fB\-\-constraint="[rack1|rack2|rack3|rack4]"\fR 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.
.IP

.TP
\fBMultiple Counts\fR
Specific counts of multiple resources may be specified by using the AND
operator and enclosing the options within square brackets.
For example, \fB\-\-constraint="[rack1*2&rack2*4]"\fR 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".

\fBNOTE\fR: This construct does not support multiple Intel KNL NUMA or MCDRAM
modes. For example, while \fB\-\-constraint="[(knl&quad)*2&(knl&hemi)*4]"\fR is
not supported, \fB\-\-constraint="[haswell*2&(knl&hemi)*4]"\fR is supported.
Specification of multiple KNL modes requires the use of a heterogeneous job.

\fBNOTE\fR: This option is not supported by the helpers NodeFeatures plugin.

\fBNOTE\fR: Multiple Counts can cause jobs to be allocated with a non-optimal
network layout.
.IP

.TP
\fBBrackets\fR
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,
.IP

.TP
\fBParentheses\fR
Parentheses can be used to group like node features together. For example,
\fB\-\-constraint="[(knl&snc4&flat)*4&haswell*1]"\fR 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 operations. Without parentheses, node
features are parsed strictly from left to right.
For example,
\fB\-\-constraint="foo&bar|baz"\fR requests nodes with foo and bar, or baz.
\fB\-\-constraint="foo|bar&baz"\fR requests nodes with foo and baz, or bar and
baz (note how baz was AND'd with everything).
\fB\-\-constraint="foo&(bar|baz)"\fR requests nodes with foo and at least
one of bar or baz.
\fBNOTE\fR: OR within parentheses should not be used with a KNL
NodeFeatures plugin but is supported by the helpers NodeFeatures plugin.
.RE
.IP

.TP
\fB\-\-container\fR=<\fIpath_to_container\fR>
Absolute path to OCI container bundle.
.IP

.TP
\fB\-\-container-id\fR=<\fIcontainer_id\fR>
Unique name for OCI container.
.IP

.TP
\fB\-\-contiguous\fR
If set, then the allocated nodes must form a contiguous set.

\fBNOTE\fR: If the SelectType is cons_tres this option won't be honored
with the \fBtopology/tree\fR or \fBtopology/3d_torus\fR
plugins, both of which can modify the node ordering.
.IP

.TP
\fB\-S\fR, \fB\-\-core\-spec\fR=<\fInum\fR>
Count of Specialized Cores per node reserved by the job for system operations
and not used by the application.
If AllowSpecResourcesUsage is enabled a job can override the CoreSpecCount of
all its allocated nodes with this option.
The overridden Specialized Cores will still be reserved for system processes.
The job will get an implicit \fB--exclusive\fR 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 \fB\-\-thread\-spec\fR option.

.TP
\fB\-\-cpu\-freq\fR=<\fIp1\fR>[\-\fIp2\fR][:\fIp3\fR]

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).

\fBp1\fR 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 definition of the values.

\fBp1\fR 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 \fBp2\fR is present, \fBp1\fR will be the minimum scaling frequency and
\fBp2\fR will be the maximum scaling frequency. In that case the governor
\fBp3\fR or CpuFreqDef cannot be UserSpace since it doesn't support a range.

\fBp2\fR can be  [#### | medium | high | highm1]. p2 must be greater than p1 and
is incompatible with UserSpace governor.

\fBp3\fR can be [Conservative | OnDemand | Performance | PowerSave | SchedUtil |
UserSpace]
which will set the governor to the corresponding value.

If \fBp3\fR is UserSpace, the frequency scaling_speed, scaling_max_freq and
scaling_min_freq will be statically set to the value defined by \fBp1\fR.

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 frequency will be rounded to the maximum available
frequency.

The \fBCpuFreqDef\fR parameter in slurm.conf will be used to set the governor
in absence of \fBp3\fR. If there's no \fBCpuFreqDef\fR, the default governor
will be to use the system current governor set in each cpu. Specifying a
range without \fBCpuFreqDef\fR or a specific governor is therefore not allowed.

Acceptable values at present include:
.RS
.TP 14
\fB####\fR
frequency in kilohertz
.IP

.TP
\fBLow\fR
the lowest available frequency
.IP


.TP
\fBConservative\fR
attempts to use the Conservative CPU governor
.IP

.TP
\fBOnDemand\fR
attempts to use the OnDemand CPU governor (the default value)
.IP

.TP
\fBPerformance\fR
attempts to use the Performance CPU governor
.IP

.TP
\fBPowerSave\fR
attempts to use the PowerSave CPU governor
.IP

.TP
\fBUserSpace\fR
attempts to use the UserSpace CPU governor
.IP

.TP
.RE

The following informational environment variable is set in the job
step when \fB\-\-cpu\-freq\fR option is requested.
.nf
        SLURM_CPU_FREQ_REQ
.fi

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

\fBNOTE\fR: This parameter is treated as a request, not a requirement.
If the job step's node does not support setting the CPU frequency, or
the requested value is outside the bounds of the legal frequencies, an
error is logged, but the job step is allowed to continue.

\fBNOTE\fR: Setting the frequency for just the CPUs of the job step
implies that the tasks are confined to those CPUs.  If task
confinement (i.e. the task/affinity TaskPlugin is enabled, or the task/cgroup
TaskPlugin is enabled with "ConstrainCores=yes" set in cgroup.conf) is not
Request that \fIncpus\fR processors be allocated per allocated GPU.
Steps inheriting this value will imply \-\-exact.
Not compatible with the \fB\-\-cpus\-per\-task\fR option.
.IP

.TP
\fB\-c\fR, \fB\-\-cpus\-per\-task\fR=<\fIncpus\fR>
Advise Slurm that ensuing job steps will require \fIncpus\fR processors per
task. By default Slurm will allocate one processor per task.

For instance,
consider an application that has 4 tasks, each requiring 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.

\fBNOTE\fR: Beginning with 22.05, srun will not inherit the
\-\-cpus\-per\-task value requested by salloc or sbatch. It must be requested
again with the call to srun or set with the SRUN_CPUS_PER_TASK environment
variable if desired for the task(s).
.IP

.TP
\fB\-\-deadline\fR=<\fIOPT\fR>
remove the job if no ending is possible before
this deadline (start > (deadline \- time[\-min])).
Default is no deadline.  Valid time formats are:
.br
HH:MM[:SS] [AM|PM]
.br
MMDD[YY] or MM/DD[/YY] or MM.DD[.YY]
.br
MM/DD[/YY]\-HH:MM[:SS]
.br
YYYY\-MM\-DD[THH:MM[:SS]]]
.br
now[+\fIcount\fR[seconds(default)|minutes|hours|days|weeks]]
.IP

.TP
\fB\-\-delay\-boot\fR=<\fIminutes\fR>
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 specified period, it will use only
nodes which already have the specified features.
The argument is in units of minutes.
A default value may be set by a system administrator using the \fBdelay_boot\fR
option of the \fBSchedulerParameters\fR configuration parameter in the
slurm.conf file, otherwise the default value is zero (no delay).
.IP
means that the job can run only after a 0 return code of jobs 20 and 21
AND completion of job 23. However:
.nf
-d afterok:20:21?afterany:23
.fi
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
different  users. The  value may be changed after job submission using the
scontrol command.
Dependencies on remote jobs are allowed 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.
.IP
.PD
.RS
.TP
\fBafter:job_id[[+time][:jobid[+time]...]]\fR
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.
.IP

.TP
\fBafterany:job_id[:jobid...]\fR
This job can begin execution after the specified jobs have terminated.
This is the default dependency type.
.IP

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

.TP
\fBaftercorr:job_id[:jobid...]\fR
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).
.IP

.TP
\fBafternotok:job_id[:jobid...]\fR
This job can begin execution after the specified jobs have terminated
in some failed state (non\-zero exit code, node failure, timed out, etc).
.IP

.TP
\fBafterok:job_id[:jobid...]\fR

.TP
\fB\-m\fR, \fB\-\-distribution\fR={*|block|cyclic|arbitrary|plane=<\fIsize\fR>}[:{*|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 distribution 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 allocated 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.
.RS
First distribution method (distribution of tasks across nodes):

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

.TP
.B block
The block distribution method will distribute tasks to a node such
that consecutive tasks share a node. For example, consider an
allocation of three nodes each with two cpus. A four\-task block
distribution request will distribute 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 number of allocated nodes.
.IP

.TP
.B 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 example, consider an allocation of three
nodes each with two cpus. A four\-task cyclic distribution request
will distribute those tasks to the nodes with tasks one and four on
taskids assigned to each node depend on the plane size. Additional distribution
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
.IP

.TP
.B 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
requested and be one per line or comma separated.  If specifying a
task count (\fB\-n\fR, \fB\-\-ntasks\fR=<\fInumber\fR>), your tasks
will be laid out on the nodes in the order of the file.
.br
\fBNOTE\fR: The arbitrary distribution option on a job allocation only
controls the nodes to be allocated to the job and not the allocation of
CPUs on those nodes. This option is meant primarily to control a job step's
task layout in an existing job allocation for the srun command.
.br
\fBNOTE\fR: If the number of tasks is given and a list of requested nodes is
also given, the number of nodes used from that list will be reduced to match
that of the number of tasks if the number of nodes in the list is greater than
the number of tasks.
.IP

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

.TP
.B *
Use the default method for distributing CPUs across sockets (cyclic).
.IP

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

.TP
.B 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.

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

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

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

.TP
.B 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.
.IP

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

.LP
Optional control for task distribution over nodes:

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

.TP
.B NoPack
Rather than packing a job step's tasks as tightly as possible on the nodes,
distribute them evenly.
This user option will supersede the SelectTypeParameters CR_Pack_Nodes
configuration parameter.
.RE
.IP

.TP
partition's \fBOverSubscribe\fR option takes precedence over the job's option.
\fBNOTE\fR: 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.

\fBNOTE\fR: This option is mutually exclusive with \fB\-\-oversubscribe\fR.
.IP

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

If \fBSchedulerParameters=extra_constraints\fR is enabled, this string is used
for node filtering based on the \fIExtra\fR field in each node.
.IP

.TP
\fB\-B\fR, \fB\-\-extra\-node\-info\fR=<\fIsockets\fR>[:\fIcores\fR[:\fIthreads\fR]]
Restrict node selection to nodes with at least the specified number of
sockets, cores per socket and/or threads per core.
.br
\fBNOTE\fR: 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
resources of that type are to be utilized. Values can also be specified as
min\-max. The individual levels can also be specified in separate options if
desired:
.nf
    \fB\-\-sockets\-per\-node\fR=<\fIsockets\fR>
    \fB\-\-cores\-per\-socket\fR=<\fIcores\fR>
    \fB\-\-threads\-per\-core\fR=<\fIthreads\fR>
.fi
If task/affinity plugin is enabled, then specifying an allocation in this
manner also results in subsequently launched tasks being bound to threads
if the \fB\-B\fR option specifies a thread count, otherwise an option of
\fIcores\fR if a core count is specified, otherwise an option of \fIsockets\fR.
If SelectType is configured 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 allocations.
.br
\fBNOTE\fR: This option is mutually exclusive with \fB\-\-hint\fR,
\fB\-\-threads\-per\-core\fR and \fB\-\-ntasks\-per\-core\fR.
.br
\fBNOTE\fR: This option may implicitly set the number of tasks (if \fB\-n\fR
was not specified) as one task per requested thread.
.IP

.TP
\fB\-\-get\-user\-env\fR[=\fItimeout\fR][\fImode\fR]
Examples of use include "\-\-get\-user\-env", "\-\-get\-user\-env=10"
"\-\-get\-user\-env=10L", and "\-\-get\-user\-env=S".
\fBNOTE\fR: This option only works if the caller has an
effective uid of "root".
.IP

.TP
\fB\-\-gid\fR=<\fIgroup\fR>
Submit the job with the specified \fIgroup\fR's group access permissions.
\fIgroup\fR may be the group name or the numerical group ID.
In the default Slurm configuration, this option is only valid when used
by the user root.
.IP

.TP
\fB\-\-gpu\-bind\fR=[verbose,]<\fItype\fR>
Equivalent to \-\-tres\-bind=gres/gpu:[verbose,]<\fItype\fR>
See \fB\-\-tres\-bind\fR for all options and documentation.
.IP

.TP
\fB\-\-gpu\-freq\fR=[<\fItype\fR]=\fIvalue\fR>[,<\fItype\fR=\fIvalue\fR>][,verbose]
Request that GPUs allocated to the job are configured with specific frequency
values.
This option can be used to independently 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 \fItype\fR can be "memory".
If \fItype\fR is not specified, the GPU frequency is implied.
The \fIvalue\fR field can either be "low", "medium", "high", "highm1" or
a numeric value in megahertz (MHz).
If the specified numeric value is not possible, a value as close as
possible will be used. See below for definition of the values.
The \fIverbose\fR option causes current GPU frequency information to be logged.
Examples of use include "\-\-gpu\-freq=medium,memory=high" and
"\-\-gpu\-freq=450".

Supported \fIvalue\fR definitions:
.IP
.RS
.TP 10
\fBlow\fR
the lowest available frequency.
.IP

.TP
\fBmedium\fR
attempts to set a frequency in the middle of the available range.
.IP

An optional GPU type specification can be supplied.
For example "\-\-gpus=volta:3".
See also the \fB\-\-gpus\-per\-node\fR, \fB\-\-gpus\-per\-socket\fR and
\fB\-\-gpus\-per\-task\fR options.
.br
\fBNOTE\fR: The allocation has to contain at least one GPU per node.
.IP

.TP
\fB\-\-gpus\-per\-node\fR=[\fItype\fR:]<\fInumber\fR>
Specify the number of GPUs required for the job on each node included 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 \fB\-\-gpus\fR, \fB\-\-gpus\-per\-socket\fR and
\fB\-\-gpus\-per\-task\fR options.
.IP

.TP
\fB\-\-gpus\-per\-socket\fR=[\fItype\fR:]<\fInumber\fR>
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 \fB\-\-gpus\fR, \fB\-\-gpus\-per\-node\fR and
\fB\-\-gpus\-per\-task\fR options.
.IP

.TP
\fB\-\-gpus\-per\-task\fR=[\fItype\fR:]<\fInumber\fR>
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 \fB\-\-gpus\fR,
\fB\-\-gpus\-per\-socket\fR and \fB\-\-gpus\-per\-node\fR options.
This option requires 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>,
but that can be overridden with an explicit \-\-tres\-bind=gres/gpu
specification.
.br
.IP

.TP
\fB\-\-gres\fR=<\fIlist\fR>
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:kepler:2", and
"\-\-gres=help".
.IP

.TP
\fB\-\-gres\-flags\fR=<\fItype\fR>
Specify generic resource task binding options.
.IP
.RS
.TP
.B disable\-binding
Disable filtering of CPUs with respect to generic resource locality.
This option is currently required to use more CPUs than are bound to a GRES
(i.e. if a GPU is bound to the CPUs on one socket, but resources on more than
one socket are required to run the job).
This option may permit a job to be allocated resources sooner than otherwise
possible, but may result in lower job performance.
.br
\fBNOTE\fR: This option is specific to \fBSelectType=cons_tres\fR.
.IP

.TP
.B 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 application performance may be improved due to improved
communication speed.
Requires the node to be configured with more than one socket and resource
filtering will be performed on a per\-socket basis.
.br
\fBNOTE\fR: This option is specific to \fBSelectType=cons_tres\fR.
.RE
.IP

.TP
\fB\-h\fR, \fB\-\-help\fR
Display help information and exit.
.IP

.TP
\fB\-\-hint\fR=<\fItype\fR>
Bind tasks according to application hints.
.br
\fBNOTE\fR: This option cannot be used in conjunction with
\fB\-\-ntasks\-per\-core\fR, \fB\-\-threads\-per\-core\fR or \fB\-B\fR. If
\fB\-\-hint\fR is specified as a command line argument, it will take
precedence over the environment.
.TP
.B [no]multithread
[don't] use extra threads with in\-core multi\-threading
which can benefit communication intensive applications.
Only supported with the task/affinity plugin.
.IP

.TP
.B help
show this help message
.RE
.IP

.TP
\fB\-H, \-\-hold\fR
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. "\fIscontrol release <job_id>\fR").
.IP

.TP
\fB\-I\fR, \fB\-\-immediate\fR[=<\fIseconds\fR>]
exit if resources are not available within the
time period specified.
If no argument is given (seconds defaults to 1), resources must be available
immediately for the request to succeed. If \fBdefer\fR is configured in
\fBSchedulerParameters\fR and seconds=1 the allocation request will fail
immediately; \fBdefer\fR conflicts and takes precedence over this option.
By default, \fB\-\-immediate\fR is off, and the command
will block until resources become available. 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 between
them. For example "\-I60" and not "\-I 60".
.IP

.TP
\fB\-J\fR, \fB\-\-job\-name\fR=<\fIjobname\fR>
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.
.IP

.TP
\fB\-K\fR, \fB\-\-kill\-command\fR[=\fIsignal\fR]
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 \fB\-\-kill\-command\fR 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 \fBscancel\fR 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
"\-\-licenses=foo:4,bar").

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

.TP
\fB\-\-mail\-type\fR=<\fItype\fR>
Notify user by email when certain event types occur.
Valid \fItype\fR values are NONE, BEGIN, END, FAIL, REQUEUE, ALL (equivalent to
BEGIN, END, FAIL, INVALID_DEPEND, REQUEUE, and STAGE_OUT), INVALID_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 \fItype\fR values may be specified in a comma separated list.
The user to be notified is indicated with \fB\-\-mail\-user\fR.
.IP

.TP
\fB\-\-mail\-user\fR=<\fIuser\fR>
User to receive email notification of state changes as defined by
\fB\-\-mail\-type\fR.
The default value is the submitting user.
.IP

.TP
\fB\-\-mcs\-label\fR=<\fImcs\fR>
Used only when the mcs/group plugin is enabled.
This parameter is a group among the groups of the user.
Default value is calculated by the Plugin mcs if it's enabled.
.IP

.TP
\fB\-\-mem\fR=<\fIsize\fR>[\fIunits\fR]
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 \fBDefMemPerNode\fR and the maximum value is
\fBMaxMemPerNode\fR. If configured, both of parameters can be
seen using the \fBscontrol show config\fR command.
This parameter would generally be used if whole nodes
are allocated to jobs (\fBSelectType=select/linear\fR).
Also see \fB\-\-mem\-per\-cpu\fR and \fB\-\-mem\-per\-gpu\fR.
The \fB\-\-mem\fR, \fB\-\-mem\-per\-cpu\fR and \fB\-\-mem\-per\-gpu\fR
options are mutually exclusive. If \fB\-\-mem\fR, \fB\-\-mem\-per\-cpu\fR or
\fB\-\-mem\-per\-gpu\fR are specified as command line arguments, then they will
take precedence over the environment.

\fBNOTE\fR: A memory size specification of zero is treated as a special case and
grants the job access to all of the memory on each node.
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. \fBThe use of any type other than
"none" or "local" is not recommended.\fR

\fBNOTE\fR: 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
\fB\-\-mem\-bind\fR is in use:

.nf
	SLURM_MEM_BIND_LIST
	SLURM_MEM_BIND_PREFER
	SLURM_MEM_BIND_SORT
	SLURM_MEM_BIND_TYPE
	SLURM_MEM_BIND_VERBOSE
.fi

See the \fBENVIRONMENT VARIABLES\fR section for a more detailed description
of the individual SLURM_MEM_BIND* variables.

Supported options include:
.IP
.RS
.TP
.B help
show this help message
.IP

.TP
.B local
Use memory local to the processor in use
.IP

.TP
.B map_mem:<list>
Bind by setting memory masks on tasks (or ranks) as specified where <list> is
fR(5) man page for a full list of flags. The environment
variable takes precedence over the setting in the slurm.conf.
.IP

.TP
\fBSLURM_EXIT_ERROR\fR
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 \fBSLURM_EXIT_IMMEDIATE\fR.
.IP

.TP
\fBSLURM_EXIT_IMMEDIATE\fR
Specifies the exit code generated when the \fB\-\-immediate\fR option
.IP

.TP
\fBSLURM_CLUSTER_NAME\fR
Name of the cluster on which the job is executing.
.IP

.TP
\fBSLURM_CONTAINER\fR
OCI Bundle for job.
Only set if \fB\-\-container\fR is specified.
.IP

.TP
\fBSLURM_CONTAINER_ID\fR
OCI id for job.
Only set if \fB\-\-container-id\fR is specified.
.IP

.TP
\fBSLURM_CPUS_PER_GPU\fR
Number of CPUs requested per allocated GPU.
Only set if the \fB\-\-cpus\-per\-gpu\fR option is specified.
.IP

.TP
\fBSLURM_CPUS_PER_TASK\fR
Number of CPUs requested per task.
Only set if either the \fB\-\-cpus\-per\-task\fR option or the
\fB\-\-tres\-per\-task=cpu:#\fR option is specified.
.IP

.TP
\fBSLURM_DIST_PLANESIZE\fR
Plane distribution size. Only set for plane distributions.
See \fB\-m, \-\-distribution\fR.
.IP

.TP
\fBSLURM_DISTRIBUTION\fR
Only set if the \fB\-m, \-\-distribution\fR option is specified.
.IP

.TP
\fBSLURM_GPU_BIND\fR
Requested binding of tasks to GPU.
Only set if the \fB\-\-gpu\-bind\fR option is specified.
.IP

.TP
\fBSLURM_GPU_FREQ\fR
Requested GPU frequency.

.TP
\fBSLURM_GPUS_PER_SOCKET\fR
Requested GPU count per allocated socket.
Only set if the \fB\-\-gpus\-per\-socket\fR option is specified.
.IP

.TP
\fBSLURM_GPUS_PER_TASK\fR
Requested GPU count per allocated task.
Only set if the \fB\-\-gpus\-per\-task\fR option is specified.
.IP

.TP
\fBSLURM_HET_SIZE\fR
Set to count of components in heterogeneous job.
.IP

.TP
\fBSLURM_JOB_ACCOUNT\fR
Account name associated of the job allocation.
.IP

.TP
\fBSLURM_JOB_CPUS_PER_NODE\fR
Count of CPUs available to the job on the nodes in the allocation, using the
format \fICPU_count\fR[(x\fInumber_of_nodes\fR)][,\fICPU_count\fR
[(x\fInumber_of_nodes\fR)] ...].
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 allocation
has 72 CPUs, while the third node has 36 CPUs.
\fBNOTE\fR: The \fBselect/linear\fR plugin allocates entire nodes to jobs, so
the value indicates the total count of CPUs on allocated nodes. The
\fBselect/cons_tres\fR plugin allocates individual
CPUs to jobs, so this number indicates the number of CPUs allocated to the job.
.IP

.TP
\fBSLURM_JOB_END_TIME\fR
The UNIX timestamp for a job's projected end time.
.IP

.TP
\fBSLURM_JOB_GPUS\fR
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.
.IP

.TP
\fBSLURM_JOB_ID\fR
The ID of the job allocation.
Name of the partition in which the job is running.
.IP

.TP
\fBSLURM_JOB_QOS\fR
Quality Of Service (QOS) of the job allocation.
.IP

.TP
\fBSLURM_JOB_RESERVATION\fR
Advanced reservation containing the job allocation, if any.
.IP

.TP
\fBSLURM_JOB_START_TIME\fR
UNIX timestamp for a job's start time.
.IP

.TP
\fBSLURM_JOBID\fR
The ID of the job allocation. See \fBSLURM_JOB_ID\fR. Included for backwards
compatibility.
.IP

.TP
\fBSLURM_MEM_BIND\fR
Set to value of the \fB\-\-mem\-bind\fR option.
.IP

.TP
\fBSLURM_MEM_BIND_LIST\fR
Set to bit mask used for memory binding.
.IP

.TP
\fBSLURM_MEM_BIND_PREFER\fR
Set to "prefer" if the \fB\-\-mem\-bind\fR option includes the prefer option.
.IP

.TP
\fBSLURM_MEM_BIND_SORT\fR
Sort free cache pages (run zonesort on Intel KNL nodes)
.IP

.TP
\fBSLURM_MEM_BIND_TYPE\fR
Set to the memory binding type specified with the \fB\-\-mem\-bind\fR option.
Possible values are "none", "rank", "map_map", "mask_mem" and "local".
.IP

.TP
\fBSLURM_MEM_BIND_VERBOSE\fR

.TP
\fBSLURM_MEM_PER_NODE\fR
Same as \fB\-\-mem\fR
.IP

.TP
\fBSLURM_NNODES\fR
Total number of nodes in the job allocation. See \fBSLURM_JOB_NUM_NODES\fR.
Included for backwards compatibility.
.IP

.TP
\fBSLURM_NODELIST\fR
List of nodes allocated to the job. See \fBSLURM_JOB_NODELIST\fR. Included
for backwards compatibility.
.IP

.TP
\fBSLURM_NPROCS\fR
Set to value of the \fB\-\-ntasks\fR option, if specified. Or, if either of
the \fB\-\-ntasks\-per\-node\fR or \fB\-\-ntasks\-per\-gpu\fR options are
specified, set to the number of tasks in the job.
See \fBSLURM_NTASKS\fR. Included for backwards compatibility.
.IP

.TP
\fBSLURM_NTASKS\fR
Set to value of the \fB\-\-ntasks\fR option, if specified. Or, if either of
the \fB\-\-ntasks\-per\-node\fR or \fB\-\-ntasks\-per\-gpu\fR options are
specified, set to the number of tasks in the job.
.IP

.TP
\fBSLURM_NTASKS_PER_CORE\fR
Set to value of the \fB\-\-ntasks\-per\-core\fR option, if specified.
.IP

.TP
\fBSLURM_NTASKS_PER_GPU\fR
Set to value of the \fB\-\-ntasks\-per\-gpu\fR option, if specified.
.IP

.TP
\fBSLURM_NTASKS_PER_NODE\fR
Set to value of the \fB\-\-ntasks\-per\-node\fR option, if specified.
.IP

.TP
\fBSLURM_NTASKS_PER_SOCKET\fR
Set to value of the \fB\-\-ntasks\-per\-socket\fR option, if specified.
.IP
.IP

.TP
\fBSLURM_SUBMIT_DIR\fR
The directory from which \fBsalloc\fR was invoked or, if applicable, the
directory specified by the \fB\-D, \-\-chdir\fR option.
.IP

.TP
\fBSLURM_SUBMIT_HOST\fR
The hostname of the computer from which \fBsalloc\fR was invoked.
.IP

.TP
\fBSLURM_TASKS_PER_NODE\fR
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.
.IP

.TP
\fBSLURM_THREADS_PER_CORE\fR
This is only set if \fB\-\-threads\-per\-core\fR or
\fBSALLOC_THREADS_PER_CORE\fR were specified. The value will be set to the
value specified by \fB\-\-threads\-per\-core\fR or
\fBSALLOC_THREADS_PER_CORE\fR. This is used by subsequent srun calls within the
job allocation.
.IP

.TP
\fBSLURM_TRES_PER_TASK\fR
Set to the value of \fB\-\-tres\-per\-task\fR. If \fB\-\-cpus\-per\-task\fR is
specified, it is also set in \fBSLURM_TRES_PER_TASK\fR as if it were specified
in \fB\-\-tres\-per\-task\fR.
.IP

.SH "SIGNALS"
.LP
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 finish.
Another exception is SIGTERM, which will be forwarded to the spawned process.

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

.nf
$ salloc \-N5 srun \-n10 myprogram
.fi

.TP
To create a heterogeneous job with 3 components, each allocating a unique set \
of nodes:
.IP
.nf
$ 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
.fi

.SH "COPYING"
Copyright (C) 2006\-2007 The Regents of the University of California.
Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
.br
Copyright (C) 2008\-2010 Lawrence Livermore National Security.
.br
Copyright (C) 2010\-2022 SchedMD LLC.
.LP
This file is part of Slurm, a resource management program.
For details, see <https://slurm.schedmd.com/>.
.LP
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 option)
any later version.
.LP
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.

.SH "SEE ALSO"
.LP
\fBsinfo\fR(1), \fBsattach\fR(1), \fBsbatch\fR(1), \fBsqueue\fR(1), \fBscancel\fR(1), \fBscontrol\fR(1),
\fBslurm.conf\fR(5), \fBsched_setaffinity\fR (2), \fBnuma\fR (3)