Multiple programs, multiple data

Using multiple programs on different data within a single job takes a bit ofset up, as you need to tell the MPI starter exactly what to run and where to run it.

Jobscript

Example script hello.slurm for a code with two binaries

• one OpenMP binary hello_omp.bin running on 1 node, 2 MPI tasks per node and 4 OpenMP threads per task,
• one MPI binary hello_mpi.bin running on 2 nodes, 4 MPI tasks per node.

#!/bin/bash
#SBATCH --time=00:10:00
#SBATCH --nodes=3
#SBATCH --partition=medium:test
 
module load impi
export SLURM_CPU_BIND=none
export OMP_NUM_THREADS=4
 
scontrol show hostnames $SLURM_JOB_NODELIST | awk '{if(NR==1) {print $0":2"} else {print $0":4"}}' > machines.txt
mpirun -machine machines.txt -n 2 ./hello_omp.bin : -n 8 ./hello_mpi.bin