Sample job script to run two MPI tasks within one job script concurrently:

Sample Job when for running multiple mpi jobs on a VSC-4 node.

Note: The “mem_per_task” should be set such that

mem_per_task * mytasks < mem_per_node - 2Gb

The approx 2Gb reduction in available memory is due to operating system stored in memory. For a standard node with 96 Gb of Memory this would be eg.:

23 Gb * 4 = 92 Gb < 94 Gb

#!/bin/bash
#SBATCH -J many
#SBATCH -N 1

export SLURM_STEP_GRES=none

mytasks=4
cmd="stress -c 24"
mem_per_task=10G

for i in `seq 1 $mytasks`
do
        srun --mem=$mem_per_task --cpus-per-task=2 --ntasks=1 $cmd &
done
wait