03-19-2009
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MPI implementations generally do not differentiate between "real" processors and nowadays cores. Therefore the command in your case should be "mpiexec -np 6 oasis" (assuming you have 6 cores).
Most MPI implementations will spawn n processes to get n cores working, some will likely spawn one process with n threads, some will do something in between or wholly different. But on the user side all will give you n crunching cores. How many processes a specific MPI implementation spawns to achieve this is generally unimportant.
Why is this an issue for you?