Dear all, I'm looking into launching python in parallel using MPI. There are many projects already doing this but I would like to understand how this can be done in a portable way.
For instance, is it possible to launch myscript.py (which calls MPI_Init through an extension module) like: mpirun -np 2 /path/to/python myscript.py Using mpichgm this works, using stock mpich-1.2.5.2 (ch_p4) however, this does not work. I have been looking into the implemenation of p4 and the behavious (as described above) is understandable. The reason is that p4 creates the remote processes _in_ the MPI_Init of the master. The MPI_Init performs and execlp specifying the name of the executable only. Once the 'slave' is launched and also calls the MPI_Init, the command-line arguments are passed on to the slave. But the slave will thus only launch python, not the myscript.py. Therefore it will never call MPI_Init. I would like to know how other parallel python projects handle this. Thanks in advance, Toon Knapen -- http://mail.python.org/mailman/listinfo/python-list
