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 <[email protected]> on behalf of
Christopher Benjamin Coffey <[email protected]>
Date: Saturday, 19 February 2022 at 3:17 am
To: slurm-users <[email protected]>
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
