Magi

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===== Simple job script =====

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

===== OpenMP job script =====

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

===== MPI job script =====

  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