SLURM

#SBATCH Usage

If you are writing a jobscript for a SLURM batch system, the magic cookie is "#SBATCH". To use it, start a new line in your script with "#SBATCH". Following that, you can put one of the parameters shown below, where the word written in <...> should be replaced with a value.

Basic settings:

Parameter	Function
--job-name=<name>	job name
--output=<path>	path to the file where the job (error) output is written

Requesting resources:

Parameter	Function
--time=<runlimit>	runtime limit in the format hours:min:sec; once the time specified is up, the job will be killed by the scheduler
--mem=<memlimit>	job memory request, e. g. 1gb

Parallel programming (read more here):

Settings for OpenMP:

Parameter	Function
--nodes=1	start a parallel job for a shared-memory system on only one node
--cpus-per-task=<num_threads>	number of threads to execute OpenMP application with
--ntasks-per-core=<num_hyperthreads>	number of hyperthreads per core; i. e. any value greater than 1 will turn on hyperthreading (the possible maximum depends on your CPU)
--ntasks-per-node=1	for OpenMP, use one task per node only

Settings for MPI:

Parameter	Function
--nodes=<num_nodes>	start a parallel job for a distributed-memory system on several nodes
--cpus-per-task=1	for MPI, use one task per CPU
--ntasks-per-core=1	disable hyperthreading
--ntasks-per-node=<num_procs>	number of processes per node (the possible maximum depends on your nodes)

Jobscript Examples

This serial job will run a given executable, in this case "myapp.exe".

#!/bin/bash

### Job name
#SBATCH --job-name=MYJOB

### File for the output
#SBATCH --output=MYJOB_OUTPUT

### Time your job needs to execute, e. g. 15 min 30 sec
#SBATCH --time=00:15:30

### Memory your job needs, e. g. 1 GB
#SBATCH --memory=1gb

### The last part consists of regular shell commands:
### Change to working directory
cd /home/usr/workingdirectory

### Execute your application
myapp.exe

References

SBATCH documentation

SLURM jobscript generator