[slurm-users] Can job submit plugin detect "--exclusive" ?

[Christopher Benjamin Coffey]

Hi Greg,

Thank you! The key was to use integer boolean instead of true/false. It seems this is inconsistent for job_desc elements as some use true/false. Have a great one!

Best,
Chris
 
-- 
Christopher Coffey
High-Performance Computing
Northern Arizona University
928-523-1167
 
 

On 2/18/22, 9:09 PM, "slurm-users on behalf of Greg Wickham" <slurm-users-bounces at lists.schedmd.com on behalf of greg.wickham at kaust.edu.sa> wrote:

    Hi Chris,

    You mentioned “But trials using this do not seem to be fruitful so far.” . . why?

    In our job_submit.lua there is:


        if job_desc.shared == 0 then
          slurm.user_msg("exclusive access is not permitted with GPU jobs.")
          slurm.user_msg("Remove '--exclusive' from your job submission script")
          return ESLURM_NOT_SUPPORTED
        end

    and testing:

    $ srun --exclusive --time 00:10:00 --gres gpu:1 --pty /bin/bash -i 
    srun: error: exclusive access is not permitted with GPU jobs.
    srun: error: Remove '--exclusive' from your job submission script
    srun: error: Unable to allocate resources: Requested operation is presently disabled

    In slurm.h the job_descriptor struct has:

            uint16_t shared;        /* 2 if the job can only share nodes with other
                                     *   jobs owned by that user,
                                     * 1 if job can share nodes with other jobs,
                                     * 0 if job needs exclusive access to the node,
                                     * or NO_VAL to accept the system default.
                                     * SHARED_FORCE to eliminate user control. */

    If there’s a case where using “.shared” isn’t working please let us know.

       -Greg


    From: slurm-users <slurm-users-bounces at lists.schedmd.com> on behalf of Christopher Benjamin Coffey <Chris.Coffey at nau.edu>
    Date: Saturday, 19 February 2022 at 3:17 am
    To: slurm-users <slurm-users at lists.schedmd.com>
    Subject: [EXTERNAL] [slurm-users] Can job submit plugin detect "--exclusive" ?

    Hello!

    The job_submit plugin doesn't appear to have a way to detect whether a user requested "--exclusive". Can someone confirm this? Going through the code: src/plugins/job_submit/lua/job_submit_lua.c I don't see anything related. Potentially "shared" could be possible
     in some way. But trials using this do not seem to be fruitful so far.

    If a user requests --exclusive, I'd like to append "--exclude=<nodes>" on to their job request to keep them off of certain nodes. For instance, we have our gpu nodes in a default partition with a high priority so that jobs don't land on them until last. And
     this is the same for our highmem nodes. Normally this works fine, but if someone asks for "--exclusive" this will land on these nodes quite often unfortunately.

    Any ideas? Of course, I could take these nodes out of the partition, yet I'd like to see if something like this would be possible.

    Thanks! :)

    Best,
    Chris

    -- 
    Christopher Coffey
    High-Performance Computing
    Northern Arizona University
    928-523-1167