mpi.py

#!/usr/bin/python

import sys

try:
    from ctypes import CDLL, pythonapi, c_int, POINTER, c_char_p, byref, RTLD_GLOBAL
    from ctypes.util import find_library
except ImportError:
    print 'ERROR! La libreria *ctypes* para Python no esta disponible!'
    sys.exit(-1)

libc = CDLL('libc.so.6')

print libc._handle, libc._name

f = pythonapi.Py_GetArgcArgv
argc = c_int()
argv = POINTER(c_char_p)()
f(byref(argc), byref(argv))

mpi = CDLL(find_library('mpi'), RTLD_GLOBAL)
print mpi._handle, mpi._name

myrank = c_int();
nprocs = c_int();

opt_flag = c_int.in_dll(pythonapi, "MPI_COMM_WORLD") # Aqui falla al acceder a MPI_COMM_WORLD

#mpi.MPI_Comm_size(mpi.MPI_COMM_WORLD, byref(nprocs)); # Lo necesito aqui, pero no funciona MPI_COMM_WORLD

libc.printf("Hello from processor %d of %d\n", myrank, nprocs);

mpi.MPI_Finalize()