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Sorry for the delay in replying. Pat Miller is better qualified to
answer this question, but I will try to outline the answer.
pympi is itself a special version of the python interpreter that is mpi
aware. Most users are specifically using pympi, because it allows them
to AVOID having to write parallel programs in a low level language like C.
pympi is mpi aware, because it initialises the MPI processes at startup.
You access them through the loading of the mpi module with this statement:
>>> import mpi
There is an example of the other approach, where the mpi calls are made
in a compiled module here:
http://pympi.sourceforge.net/examples.html
See the simple extension example. This is actually a python extension
that also includes mpi calls using the MPI C api directly without going
through python, for instance it uses the C api to get it's own rank:
MPI_Comm_rank(MPI_COMM_WORLD,&rank);
I have not used the C api myself from pympi, for the reasons I stated at
the beginning:
regards
Julian Cook
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