HPC Roll: Users Guide: 
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To interactively launch a test OpenMPI program on two processors:
Create a file in your home directory named machines, and put two entries in it, such as:
compute-0-0 compute-0-1 |
Now launch the job from the frontend:
$ ssh-agent $SHELL $ ssh-add /opt/openmpi/bin/mpirun -np 2 -machinefile machines /opt/mpi-tests/bin/mpi-ring |
 | You must run MPI programs as a regular user (that is, not root). If you don't have a user account on the cluster, create one for yourself, and propogate the information to the compute nodes with:
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