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This script requests 16 cores on nodes with InfiniBand:

mpi.submit

#!/bin/sh
#SBATCH --ntasks=16
#SBATCH --mem-per-cpu=1024
#SBATCH --time=03:15:00
#SBATCH --error=/work/[groupname]/[username]/job.%J.err
#SBATCH --output=/work/[groupname]/[username]/job.%J.out

 

module load compiler/gcc/7.1 openmpi/2.1

mpirun /home/[groupname]/[username]/mpiprogram

The above job will allocate 16 cores on the default partition.  The 16 cores could be on any of the nodes in the partition, even split between multiple nodes.

Advanced Submission

Some users may prefer to specify more details. This will allocate 32 tasks, 16 on each of two nodes:

mpi.submit

#!/bin/sh
#SBATCH --nodes=2
#SBATCH --ntasks-per-node=16
#SBATCH --mem-per-cpu=1024
#SBATCH --time=03:15:00
#SBATCH --error=/work/[groupname]/[username]/job.%J.err
#SBATCH --output=/work/[groupname]/[username]/job.%J.out

 

module load compiler/gcc/7.1 openmpi/2.1

mpirun /home/[groupname]/[username]/mpiprogram

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