Mitko, Thank you for your response.
You understand the problem correctly. The Python module uses MPI calls in its implementation. The idea of the project is to create an abstraction for a distributed memory computer. In doing so, the user is mostly isolated from a need to understand and use MPI calls. After my post, I was able to find some more information on the subject. I think you are right in that mpiexec (or equivalents) would not work without some extra work. However it seems that using an additional module (such as <a href="http://datamining.anu.edu.au/~ole/pypar/";>Pypar</a>) would allow me to use Python with mpiexec. Thank you, ~doug On Oct 20, 7:13 pm, Mitko Haralanov <[EMAIL PROTECTED]> wrote: > On 19 Oct 2006 06:51:00 -0700 > > "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > > 1) Would setting up an environment like this require modifying the > > Python interpreter or the C++ module that is being wrapped? What I'm > > hoping is that the C++ module can go on happily doing MPI operations > > despite the fact that it is actually being called by the Python > > interpreter.If I am understanding you correctly, you have a Python module > > which > calls into the C++ library to do the actual MPI operations. If that is > the case, then there should be any problems just calling the Python > wrappers. The MPI library should be unaffected. It would be the same as > having your node programs call into the C++ library, now you just have > one more layer of abstraction. > > > 2) Would it be possible to spawn these Python processes using mpiexec > > (or something similar), or would I need to use some of the MPI-2 > > features to dynamically set up the MPI environment?If you are writing a > > Python wrapper to the MPI library, then the > wrapper will be just like a module and not a self sustained program. If > that is the case, mpiexec/mpirun/mpd would not be able to do anything > since they expect to start a program that has main()/__main__. > > > 3) Has anyone accomplished something like this already? I know there > > are extensions and modules that add MPI functionality to Python, but > > I'm hoping they could be avoided, since the Python code itself should > > never really have to be aware of MPI, only the C++ module that has > > already been written.Haven't done it but from what I know about MPI and > > Python, it is > possible. > > -- > Mitko Haralanov [EMAIL PROTECTED] > Senior Software Engineer 650.934.8064 > System Interconnect Group http://www.qlogic.com -- http://mail.python.org/mailman/listinfo/python-list
