Slurm job script

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

• the request for compute nodes of a CPU Genoa partition and
• commands to start your binary. You have two options to start an MPI binary.
  • using mpirun
  • using srun

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-genoa
module load openmpi/gcc/5.0.3
export SLURM_CPU_BIND=none
mpirun -np 384 --map-by ppr:192:node ./hello.bin

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

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

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