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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