Calcolo_Parallelo_Cluster_Steffe/MPI_basic

# Usage of cluster with slurm

Information about che cluster and partitions could be obtained doing:
 sinfo
 scontrol show partition

With srun we cen reserve a subset of the resources of the compute nodes for out tasks:
More parameters are provided in the documentation.
 srun --partition=production --time=00:30:00 --nodes=1 --pty bash -i
 (take for half hour 1 node from the production partition and launch the command 'bash -i')

To simplify all this expression we can create a basic batch file with all directives and the code to run.
Is a good thing to redirect the output in a file to save it securely.
 sbatch run.sh

Example of batch script
 #!/bin/bash
 #SBATCH -n 10
 #SBATCH --time=00:30:00
 ...
 mpirun ./my_exec_code

To see the queue of jobs in the system we can run
 squeue
 squeue --long

To remove a job from the queue we can run
 scancel <job/process_id>