Specify the Number of Processes

Use the -np option to specify the number of processes you want to start; the default is 1. This option is typically used with a Sun MPI program.

For example,

% mprun -p part2 -np 4 a.out

specifies that you want four copies of a.out to start on the nodes of the partition named part2.

You can also specify 0 as the -np value. The CRE will start one process per CPU on each available CPU. Thus, if the partition part2 has six available CPUs, the command

% mprun -p part2 -np 0 a.out

will start six copies of a.out.