Mike Roberts wrote:
> Hi.
> I have a working non parallel code in Octave that I am trying to set
> up to work in parallel. Really what I need is to run a few pieces of
> the code in Parallel, one big matrix multiplication and one big matrix
> inversion (actually it uses the backslash operator).
Sorry for the confussion. MPITB is not a tool for automatically
parallelizing Octave matrix operations. It's an Octave interface to MPI.
I would be willling to correct any sentence in MPITB web or help files
that could be misleading prospective users to make them believe MPITB
will automatically parallelize their Octave code.
> I see many of the sample mpitb octave codes seem to split up the
> processes manually, sending them to different nodes;
Indeed. All MPITB examples have to do so. There isn't any form of
implicit parallelism in MPITB, all must be explicitly parallelized.
> I am not sure how I would do that here. Any good info on how to do
> this would be great, perhaps even a nice reference on using mpitb with
> octave would also be great. I am very new to using mpi, so I a might
> be missing something basic.
I'm not sure you can benefit from MPITB. Perhaps ScaLAPACK and Octave
DLDs are more appropriate tools for your target.
http://wiki.octave.org/wiki.pl?CategoryExternal
http://www.netlib.org/scalapack/scalapack_home.html
In any case, in order to use MPITB you must choose exactly which code is
to be run over exactly which data on each or your cluster nodes. If you
can't (or don't want to) do the choice, your tool is not MPITB.
Send me a personal e-mail if you want me to modify any sentence in MPITB
web or help file. Again, sorry for the confussion. Hope it didn't make
you lose much time.
-javier
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