NAME

       sbcast - transmit a file to the nodes allocated to a Slurm job.

SYNOPSIS

       sbcast [-CfFjpstvV] SOURCE DEST

DESCRIPTION

       sbcast is used to transmit a file to all nodes allocated to the currently active Slurm job.  This command
       should  only  be  executed  from within a Slurm batch job or within the shell spawned after a Slurm job's
       resource allocation.  SOURCE is the name of a file on  the  current  node.   DEST  should  be  the  fully
       qualified  pathname  for  the file copy to be created on each node.  If a fully qualified pathname is not
       provided, the file will be created in the directory specified in the SbcastParameters  parameter  in  the
       slurm.conf  file  (if available) otherwise it will be created in the current working directory from which
       the sbcast command is invoked.  DEST should be on a file system local to that node.  Note  that  parallel
       file  systems  may  provide better performance than sbcast can provide, although performance will vary by
       file size, degree of parallelism, and network type.

OPTIONS

       -C [library], --compress[=library]
              Compress the file being transmitted.  The optional argument specifies the data compression library
              to be used.  Supported values are "lz4" (default), "none" and "zlib".  Some compression  libraries
              may  be  unavailable  on  some systems.  The default compression library (and enabling compression
              itself) may be set in the slurm.conf file using the SbcastParameter option.

       -f, --force
              If the destination file already exists, replace it.

       -F number, --fanout=number
              Specify the fanout of messages used for file transfer.  Maximum value is currently eight.

       -j jobID[.stepID], --jobid=jobID[.stepID]
              Specify the job ID to use with optional step ID.  If run inside an allocation this is unneeded  as
              the job ID will read from the environment.

       -p, --preserve
              Preserves modification times, access times, and modes from the original file.

       -s size, --size=size
              Specify  the  block  size  used  for  file  broadcast.   The  size can have a suffix of k or m for
              kilobytes or megabytes respectively (defaults to bytes).  This size subject to rounding and  range
              limits  to  maintain  good  performance.   The default value is the file size or 8MB, whichever is
              smaller.  This value may need to be set on systems with very limited memory.

       -t seconds, --timeout=seconds
              Specify the message timeout in seconds.  The  default  value  is  MessageTimeout  as  reported  by
              "scontrol  show  config".   Setting  a  higher  value  may  be necessitated by relatively slow I/O
              performance on the compute node disks.

       -v, --verbose
              Provide detailed event logging through program execution.

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

ENVIRONMENT VARIABLES

       Some sbcast options may be set via environment variables.  These environment variables, along with  their
       corresponding  options,  are  listed  below.  (Note:  Command  line  options  will  always override these
       settings.)

       SBCAST_COMPRESS     -C, --compress

       SBCAST_FANOUT       -F number, --fanout=number

       SBCAST_FORCE        -f, --force

       SBCAST_PRESERVE     -p, --preserve

       SBCAST_SIZE         -s size, --size=size

       SBCAST_TIMEOUT      -t seconds, --timeout=seconds

       SLURM_CONF          The location of the Slurm configuration file.

AUTHORIZATION

       When using the Slurm db, users who have AdminLevel's defined  (Operator  or  Admin)  and  users  who  are
       account coordinators are given the authority to invoke sbcast on other user's jobs.

EXAMPLE

       Using a batch script, transmit local file my.prog to /tmp/my.proc on the local nodes and then execute it.

       > cat my.job
       #!/bin/bash
       sbcast my.prog /tmp/my.prog
       srun /tmp/my.prog

       > sbatch --nodes=8 my.job
       srun: jobid 12345 submitted

COPYING

       Copyright  (C)  2006-2010  The  Regents  of the University of California.  Produced at Lawrence Livermore
       National Laboratory (cf, DISCLAIMER).
       Copyright (C) 2010-2016 SchedMD LLC.

       This   file   is   part   of   Slurm,   a   resource    management    program.     For    details,    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
       option) 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

       srun(1)

October 2016                                     Slurm Commands                                        sbcast(1)