[slurm-users] Job running slower when using Slurm

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