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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
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 -l hello_openmp
nicolas.greneche@magi1:~$ sbatch run.slurm Submitted batch job 44075 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
srun ./hellompi
nicolas.greneche@magi1:~$ sbatch run.slurm Submitted batch job 44082 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