Roger. I didn't configure Slurm so let me look at slurm.conf and gres.conf to see if they restrict a job to a single CPU.
Thanks On Wed, Apr 23, 2025 at 1:48 PM Michael DiDomenico via slurm-users < slurm-users@lists.schedmd.com> wrote: > without knowing anything about your environment, its reasonable to > suspect that maybe your openmp program is multi-threaded, but slurm is > constraining your job to a single core. evidence of this should show > up when running top on the node, watching the cpu% used for the > program > > On Wed, Apr 23, 2025 at 1:28 PM Jeffrey Layton via slurm-users > <slurm-users@lists.schedmd.com> wrote: > > > > Good morning, > > > > I'm running an NPB test, bt.C that is OpenMP and built using NV HPC SDK > (version 25.1). I run it on a compute node by ssh-ing to the node. It runs > in about 19.6 seconds. > > > > Then I run the code using a simple job: > > > > Command to submit job: sbatch --nodes=1 run-npb-omp > > > > The script run-npb-omp is the following: > > > > #!/bin/bash > > > > cd /home/.../NPB3.4-OMP/bin > > > > ./bt.C.x > > > > > > When I use Slurm, the job takes 482 seconds. > > > > Nothing really appears in the logs. It doesn't do any IO. No data is > copied anywhere. I'm king of at a loss to figure out why. Any suggestions > of where to look? > > > > Thanks! > > > > Jeff > > > > > > > > -- > > slurm-users mailing list -- slurm-users@lists.schedmd.com > > To unsubscribe send an email to slurm-users-le...@lists.schedmd.com > > -- > slurm-users mailing list -- slurm-users@lists.schedmd.com > To unsubscribe send an email to slurm-users-le...@lists.schedmd.com >
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