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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Then MPI will work exactly as you are expecting, that's what it
does as it were.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
mpich-discuss-bounces@mcs.anl.gov [mailto:mpich-discuss-bounces@mcs.anl.gov] <b>On
Behalf Of </b>Michael Morrison<br>
<b>Sent:</b> Monday, July 12, 2010 5:21 PM<br>
<b>To:</b> mpich-discuss@mcs.anl.gov<br>
<b>Subject:</b> Re: [mpich-discuss] Integrating parallel and serial code<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'>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<o:p></o:p></p>
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<p class=MsoNormal>On Mon, Jul 12, 2010 at 2:57 PM, Hiatt, Dave M <<a
href="mailto:dave.m.hiatt@citi.com">dave.m.hiatt@citi.com</a>> wrote:<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>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><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <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><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>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<o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br>
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<a href="https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss"
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