Manual Reference Pages - SRUN_CR (1)
srun_cr - run parallel jobs with checkpoint/restart support
The design of srun_cr is inspired by mpiexec_cr from MVAPICH2 and
cr_restart form BLCR.
It is a wrapper around the srun command to enable batch job
checkpoint/restart support when used with Slurms checkpoint/blcr plugin.
The srun_cr execute line options are identical to those of the srun
See "man srun" for details.
After initialization, srun_cr registers a thread context callback
Then it forks a process and executes "cr_run --omit srun" with its arguments.
cr_run is employed to exclude the srun process from being dumped
All catchable signals except SIGCHLD sent to srun_cr will be forwarded
to the child srun process.
SIGCHLD will be captured to mimic the exit status of srun when it exits.
Then srun_cr loops waiting for termination of tasks being launched
The step launch logic of Slurm is augmented to check if srun is running
If true, the environment variable SLURM_SRUN_CR_SOCKET should be present,
the value of which is the address of a Unix domain socket created and listened
to be srun_cr.
After launching the tasks, srun tries to connect to the socket and sends
the job ID, step ID and the nodes allocated to the step to srun_cr.
Upon checkpoint, srun_cr checks to see if the tasks have been launched.
If not srun_cr first forwards the checkpoint request to the tasks by
calling the Slurm API slurm_checkpoint_tasks() before dumping its process
Upon restart, srun_cr checks to see if the tasks have been previously
launched and checkpointed.
If true, the environment variable SLURM_RESTART_DIR is set to the directory
of the checkpoint image files of the tasks.
Then srun is forked and executed again.
The environment variable will be used by the srun command to restart
execution of the tasks from the previous checkpoint.
Copyright (C) 2009 National University of Defense Technology, China.
Produced at National University of Defense Technology, China (cf, DISCLAIMER).
This file is part of Slurm, a resource management program.
For details, see <http://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
|April 2015 ||SRUN_CR (1) ||Slurm Commands |
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