    \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

    NOTE: 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.

    configuration file, \fIslurm.conf\fR.
    The supported format is as follows:
    .RS
    .TP 12
    \fB\-\-acctg\-freq=\fR\fI<datatype>\fR\fB=\fR\fI<interval>\fR
    where \fI<datatype>\fR=\fI<interval>\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 \fI<datatype>\fR=\fI<interval>\fR intervals
    may be specified. Supported datatypes are as follows:
    .RS
    .TP
    \fBtask=\fI<interval>\fR
    where \fI<interval>\fR is the task sampling interval in seconds
    for the jobacct_gather plugins and for task
    profiling by the acct_gather_profile plugin.
    NOTE: 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.  They can not turn it off (=0) either.
    .TP
    \fBenergy=\fI<interval>\fR
    where \fI<interval>\fR is the sampling interval in seconds
    for energy profiling using the acct_gather_energy plugin
    .TP
    \fBnetwork=\fI<interval>\fR
    where \fI<interval>\fR is the sampling interval in seconds
    for infiniband profiling using the acct_gather_interconnect
    plugin.
    .TP
    \fBfilesystem=\fI<interval>\fR
    where \fI<interval>\fR is the sampling interval in seconds
    for filesystem profiling using the acct_gather_filesystem
    plugin.
    .TP
    .RE
    .RE
    .br
    The default value for the task sampling interval
    is 30. 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
    .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
    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_res, 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.
    \fBNOTE:\fR This option is mutually exclusive with \fB\-\-hint\fR,
    \fB\-\-threads\-per\-core\fR and \fB\-\-ntasks\-per\-core\fR.

    .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.

    .TP
    \fB\-\-bbf\fR=<\fIfile_name\fR>
    Path of file containing burst buffer specification.
    The form of the specification is system dependent.
    Also see \fB\-\-bb\fR.
    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.

    .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)

    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
    \fB\-\-bell\fR
    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 \fB\-\-no\-bell\fR.

    .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.

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

    .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.
    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).
    Supported \fbconstraint\fR options include:
    .PD 1
    .RS
    .TP
    \fBSingle Name\fR
    Only nodes which have the specified feature will be used.
    For example, \fB\-\-constraint="intel"\fR
    .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."
    .TP
    \fBAND\fR
    If only nodes with all of specified features will be used.
    The ampersand is used for an AND operator.
    For example, \fB\-\-constraint="intel&gpu"\fR
    .TP
    \fBOR\fR
    If only nodes with at least one of specified features will be used.
    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.
    .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,
    \fB--constraint="[(rack1|rack2)*1&(rack3)*2]"\fR will get you one node with
    either the "rack1" or "rack2" features and two nodes with the "rack3" feature.
    The same request without the brackets will try to find a single node that
    meets those requirements.
    .TP
    \fBParenthesis\fR
    Parenthesis 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. All options within parenthesis should be
    grouped with AND (e.g. "&") operands.
    .RE

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

    \fBNOTE\fR: If SelectPlugin=cons_res 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.

    .TP
    \fB\-\-cores\-per\-socket\fR=<\fIcores\fR>
    Restrict node selection to nodes with at least the specified number of
    cores per socket.  See additional information under \fB\-B\fR option
    above when task/affinity plugin is enabled.

    .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

    If the current frequency is < min, it will be set to min. Likewise,
    if the current frequency is > max, it will be set to max.

    Acceptable values at present include:
    .RS
    .TP 14
    \fB####\fR
    frequency in kilohertz
    .TP
    \fBLow\fR
    the lowest available frequency
    .TP
    \fBHigh\fR
    the highest available frequency
    .TP
    \fBHighM1\fR
    (high minus one) will select the next highest available frequency
    .TP
    \fBMedium\fR
    attempts to set a frequency in the middle of the available range
    .TP
    \fBConservative\fR
    attempts to use the Conservative CPU governor
    .TP
    \fBOnDemand\fR
    attempts to use the OnDemand CPU governor (the default value)
    .TP
    \fBPerformance\fR
    attempts to use the Performance CPU governor
    .TP
    \fBPowerSave\fR
    attempts to use the PowerSave CPU governor
    .TP
    \fBUserSpace\fR
    attempts to use the UserSpace CPU governor
    .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: When submitting jobs with  the \fB\-\-cpu\-freq\fR option
    with linuxproc as the ProctrackType can cause jobs to run too quickly before
    Accounting is able to poll for job information. As a result not all of
    accounting information will be present.
    .RE

    .TP
    \fB\-\-cpus\-per\-gpu\fR=<\fIncpus\fR>
    Advise Slurm that ensuing job steps will require \fIncpus\fR processors per
    allocated GPU.
    Not compatible with the \fB\-\-cpus\-per\-task\fR option.

    .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.

    .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]]

    .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).
    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.
    .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.
    .TP
    \fBafterany:job_id[:jobid...]\fR
    This job can begin execution after the specified jobs have terminated.
    .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.
    .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).
    .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).
    .TP
    \fBafterok:job_id[:jobid...]\fR
    This job can begin execution after the specified jobs have successfully
    executed (ran to completion with an exit code of zero).
    .TP
    \fBexpand:job_id\fR
    Resources allocated to this job should be used to expand the specified job.
    The job to expand must share the same QOS (Quality of Service) and partition.
    Gang scheduling of resources in the partition is also not supported.
    "expand" is not allowed for jobs that didn't originate on the same cluster
    as the submitted job.
    .TP
    \fBsingleton\fR
    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 DependencyParameters=disable_remote_singleton is used in slurm.conf.
    .RE

    .TP
    \fB\-D\fR, \fB\-\-chdir\fR=<\fIpath\fR>
    Change directory to \fIpath\fR before beginning execution. The path
    in the file.    Duplicate node names in the file will be ignored.
    The order of the node names in the list is not important; the node names
    will be sorted by Slurm.

    .TP
    \fB\-\-get\-user\-env\fR[=\fItimeout\fR][\fImode\fR]
    This option will load login environment variables for the user specified
    in the \fB\-\-uid\fR option.
    The environment variables are retrieved by running something of this sort
    "su \- <username> \-c /usr/bin/env" and parsing the output.
    Be aware that any environment variables already set in salloc's environment
    will take precedence over any environment variables in the user's
    login environment.
    The optional \fItimeout\fR value is in seconds. Default value is 3 seconds.
    The optional \fImode\fR value control the "su" options.
    With a \fImode\fR value of "S", "su" is executed without the "\-" option.
    With a \fImode\fR value of "L", "su" is executed with the "\-" option,
    replicating the login environment.
    If \fImode\fR not specified, the mode established at Slurm build time
    is used.
    Example of use include "\-\-get\-user\-env", "\-\-get\-user\-env=10"
    "\-\-get\-user\-env=10L", and "\-\-get\-user\-env=S".
    NOTE: This option only works if the caller has an
    effective uid of "root".

    .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.

    .TP
    \fB\-G\fR, \fB\-\-gpus\fR=[<\fitype\fR>:]<\fInumber\fR>
    Specify the total number of GPUs required for the job.
    An optional GPU type specification can be supplied.
    For example "\-\-gpus=volta:3".
    Multiple options can be requested in a comma separated list, for example:
    "\-\-gpus=volta:3,kepler:1".
    See also the \fB\-\-gpus\-per\-node\fR, \fB\-\-gpus\-per\-socket\fR and
    \fB\-\-gpus\-per\-task\fR options.

    .TP
    \fB\-\-gpu\-bind\fR=[verbose,]<\fItype\fR>
    Bind tasks to specific GPUs.
    By default every spawned task can access every GPU allocated to the job.
    If "verbose," is specified before <\fItype\fR>, then print out GPU binding
    information.

    Supported \fItype\fR options:
    .RS
    .TP 10
    If the task/cgroup plugin is used and ConstrainDevices is set in cgroup.conf,
    then the GPU IDs are zero-based indexes relative to the GPUs allocated to the
    job (e.g. the first GPU is 0, even if the global ID is 3). Otherwise, the GPU
    IDs are global IDs, and all GPUs on each node in the job should be allocated for
    predictable binding results.
    .TP
    \fBmask_gpu:<list>\fR
    Bind by setting GPU masks on tasks (or ranks) as specified where <list> is
    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)