Slurm script

A slurm script is submitted to the job scheduler slurm. It contains

• the control about requested compute nodes and
• commands to start your binary.

Using mpirun

Using mpirun (from the MPI library) to start the binary you need to switch off slurm binding by adding export SLURM_CPU_BIND=none.

#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=cpu-clx:test
module load openmpi/gcc/5.0.3
export SLURM_CPU_BIND=none
mpirun -np 192 --map-by ppr:96:node ./hello.bin

#!/bin/bash
#SBATCH --nodes=2
#SBATCH --partition=cpu-clx:test
module load openmpi/gcc/5.0.3
export SLURM_CPU_BIND=none
mpirun -np 96 --map-by ppr:48:node ./hello.bin

MPI, OpenMP

You can run one code compiled with MPI and OpenMP. The example covers the setup

• 2 nodes,
• 4 processes per node, 24 threads per process.