Ralph, Thanks for the reply and guidance.
I ran the following: $> mpirun -np 1 hostname XXX_TUX01 $> mpirun -np 2 hostname XXX_TUX01 XXX_TUX01 $> mpirun -np 1 ./hello_c Hello, world, I am 0 of 1. $> mpirun -np 2 ./hello_c (no result, terminal does not respond until ctrl+c) > Let's simplify the issue as we have no idea what your codes are doing. > > Can you run two copies of hostname, for example? > > What about multiple copies of an MPI version of "hello" - see the examples > directory in the OMPI tarball.
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