Number of CPU cores

Each compute node has a fixed number of CPU cores. You can typically request a subset of them for your job. You can specify the number of CPU cores either per node or in total:

• --ncpus-per-node — specifies the number of CPU cores per requested compute node.
• --ncpus — specifies the total number of CPU cores for the entire job. Overrides --ncpus-per-node.

For example, if you request 2 nodes and 16 CPU cores per node, your job will have 32 CPU cores in total. You can express this either as --nnodes 2 --ncpus-per-node 16 or --nnodes 2 --ncpus 32.