Use MP Prism to Load MPI Programs

Attempting to use scalar Prism to run an MPI program can cause Prism to abort the process and issue messages such as these:

[unknown MPI_COMM_WORLD unknown] ERROR in MPI_Init: 
unclassified error: RTE_Init_lib: 
Job must be submitted to CRE: No such job
Aborting.

To run an MPI program, you must launch MP Prism. You launch MP Prism by specifying a number of processes to run. Use the -n option to specify the number of processes. For example,

% prism -n 4 a.out

launches MP Prism and loads a.out.