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Below is an example script which will submit for 4 cores on a single compute node. Feel free to copy and paste it as a job template.
#!/bin/bash
#SBATCH --job-name=multicore_job
#SBATCH --nodes=1
#SBATCH --ntasks-per-node=4
#SBATCH --time=00:15:00
#SBATCH --mail-type=BEGIN,END,FAIL
mpirun -n 4 ./program_name <optional args>
When you are ready to submit the job, you can do so by issuing the sbatch command:
sbatch <jobscript>
For more information about job parameters, please take a look at:
https://slurm.schedmd.com/pdfs/summary.pdf