Magi

A submission file script contains all the information required by SLURM in order to launch your job. We will detail a very simple script that launch “hostname” on two hosts :

nicolas.greneche@magi1:~$ cat hostname.slurm
#!/bin/bash
#SBATCH --job-name=hostname
#SBATCH --output=slurm.out
#SBATCH --error=slurm.err
#SBATCH --mail-type=end
#SBATCH --mail-user=nicolas.greneche@univ-paris13.fr
#SBATCH --nodes=2

srun hostname

We submit this script with “sbatch” command :

nicolas.greneche@magi1:~$ sbatch hostname.slurm
Submitted batch job 44066

And we check the output :

nicolas.greneche@magi1:~$ cat slurm.out
magi66
magi75

Here is a simple script for OpenMP :

nicolas.greneche@magi1:~$ cat run.slurm
#!/bin/bash
#SBATCH --job-name=OMP_hello
#SBATCH --output=slurm.out
#SBATCH --error=slurm.err
#SBATCH --partition=COMPUTE-SHORT
#SBATCH --nodes=1
#SBATCH --ntasks-per-node=1
#SBATCH --cpus-per-task=4

export OMP_NUM_THREADS=4
srun hello_openmp

We submit it :

nicolas.greneche@magi1:~$ sbatch run.slurm
Submitted batch job 44075

And check the output :

nicolas.greneche@magi1:~$ cat slurm.out
Thread 0 says: Hello World on core 6
Thread 0 reports: the number of threads are 4
Thread 1 says: Hello World on core 32
Thread 3 says: Hello World on core 1
Thread 2 says: Hello World on core 14

nicolas.greneche@magi1:~$ cat run.slurm
#!/bin/bash
#SBATCH --job-name=hello
#SBATCH --output=slurm.out
#SBATCH --error=slurm.err
#SBATCH --nodes=2
#SBATCH --ntasks-per-node=2

module load gcc/8.3.0/openmpi/3.1.4

srun ./hellompi

We submit it :

nicolas.greneche@magi1:~$ sbatch run.slurm
Submitted batch job 44082

And check the output :

nicolas.greneche@magi1:~$ cat slurm.out
Hello world from process 1 of 4 at magi66
Hello world from process 3 of 4 at magi75
Hello world from process 0 of 4 at magi66
Hello world from process 2 of 4 at magi75