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The following is a simple submission script of a parallel psana batch job run with mpi. It can be submitted with the command "sbatch submit.sh". The commands specified in the script file will be ran on the first available compute node that fits the resources requested. There are two ideas: "nodes" and "tasks per node". A "node" is a physical computer but they typical have box (with a host-name, for example) but each box/node typically has multiple-cpu-cores per node (see this page for specific numbers: Batch System Analysis Jobs). Typically the tasks-per-node parameter is set to utilize all the cores on each node.
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