Hey Dave, Thanks for taking the time to responsd! Actually i am thinking function A and B as separate modules. Basically i want function A to be able to call function B in its separate module and then have function B execute it's parallel algorithm and then return the results to function A. A and B could be completely different code sets on separate machines. Does that clarify what i'm trying to do? Sorry if i'm not explaining this clearly.<br>
<br>Mike<br><br><div class="gmail_quote">On Mon, Jul 12, 2010 at 2:57 PM, Hiatt, Dave M <span dir="ltr"><<a href="mailto:dave.m.hiatt@citi.com">dave.m.hiatt@citi.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">It sounds like you are imagining function A and B are both part
of the same executable module. If that is the case, then A can be single
threaded, but you'd be better off using OpenMP to thread function B and run in parallel
locally. Where MPI would help you is if function A is part of a program that
sends messages out to a group of computers all running function B, and you are
sending different data to all the functions B's hence you are running in
parallel that way.</span></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;">
<a href="mailto:mpich-discuss-bounces@mcs.anl.gov" target="_blank">mpich-discuss-bounces@mcs.anl.gov</a> [mailto:<a href="mailto:mpich-discuss-bounces@mcs.anl.gov" target="_blank">mpich-discuss-bounces@mcs.anl.gov</a>] <b>On
Behalf Of </b>Michael Morrison<br>
<b>Sent:</b> Monday, July 12, 2010 4:52 PM<br>
<b>To:</b> <a href="mailto:mpich-discuss@mcs.anl.gov" target="_blank">mpich-discuss@mcs.anl.gov</a><br>
<b>Subject:</b> [mpich-discuss] Integrating parallel and serial code</span></p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal">Hi All, I hope i'm posting this in the correct forum. I'm
extremely new to MPI so forgive me if my question comes off as silly. I've only
been dabbling around with parallel computing for a few weeks now but I'm
wondering about the possibilities. So far with each example that I've been
through, I create an MPI application and then run this application using the
mpiexec command. What I'm wondering about is if it would be possible to say
have a C function that executes some algorithm in a parallel manner that could
be called by another C function. For example suppose i had two C functions, the
first called function A and the second called function B. Function A is just a
normal function that runs serially, function B executes its algorithm parallelly
using MPI constucts. Is it possible to have a set up like this?<br>
<br>
>From the examples I've seen it appears that the MPI code runs as standalone
units and couldn't be integrated with serially executing code. Is this
true or is there someway to make this set up work? I may not have given enough
information to answer the question, if there's any confusion please ask and
i'll clarify.<br>
<br>
Thanks for your time,<br>
<br>
Mike</p>
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