If you don't request a node count '-N1' the srun will grab all the nodes
in the allocation. --nodelist says "give me at least this one node plus
any thing else to fulfill my request".
Try -N1 -n1 and you should get a srun that only runs on one of the nodes
in the allocation. As long as you are in the allocation you shouldn't
need --jobid=.
srun -N1 -n1 --nodelist=node1 ps -ef
should get you what you want.
On 08/26/15 08:06, Thompson, Matt[SCIENCE SYSTEMS AND APPLICATIONS INC]
(GSFC-610.1) wrote:
SLURM Dev,
I'm hoping you can help me with something. I recently had need to
figure out what's going on inside a running batch job. I had a
suspicion that maybe a job that should use, say, 48 cores on a few
nodes managed to somehow pack them all on a single node due to my
idiocy with an mpirun command.
So, I have a job-id and I know I can do, say:
srun --jobid=<JOBID> ps -ef
and I'll get a ps on the nodes in that allocation. But, if that
allocation has, say, 14 nodes, I get 14 nodes worth of information
that is hard to parse out since ps doesn't prepend/print hostname[1].
I thought maybe there is a way to run the srun command on just one of
the nodes in the allocation and I tried:
srun --jobid=<JOBID> --nodelist=node1 ps -ef
where node1 is one of the nodes in the allocation. But, no, that
doesn't seem to do what I'd hoped as I still get every node running ps.
Now, I'm sure I could whip up a bash script which tests for the
hostname and runs a command only if that matches the one I want, but I
was hoping for a nice simple way with srun itself to do this.
Matt
[1] That I know of. I didn't see "hostname" in the ps manpage.
