Running programs with mpirun


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To run an MPI program, use the mpirun command, which is located in /usr/local/mpich-1.2.5/bin. For almost all systems, you can use the command 

    mpirun -np 4 a.out
to run the program a.out on four processors. The command mpirun -help gives you a complete list of options, which may also be found in Appendix Mpirun Usage .

On exit, mpirun returns the status of one of the processes, usually the process with rank zero in MPI_COMM_WORLD.


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