[mpich-discuss] Integrating parallel and serial code

[Michael Morrison]

Thanks again Dave, here is a clearer description of what i'm trying to
accomplish:

I would like an application to be able to call a routine that happens to use
MPI.   The application itself is not fully aware that MPI is being used in
the lower level routine.

(Thanks to Mr. Solt for helping me to clarify my problem!)

Thanks,

Mike

On Mon, Jul 12, 2010 at 3:22 PM, Hiatt, Dave M <dave.m.hiatt at citi.com>wrote:

>  Then MPI will work exactly as you are expecting, that's what it does as
> it were.
>
>
>
> *From:* mpich-discuss-bounces at mcs.anl.gov [mailto:
> mpich-discuss-bounces at mcs.anl.gov] *On Behalf Of *Michael Morrison
> *Sent:* Monday, July 12, 2010 5:21 PM
>
> *To:* mpich-discuss at mcs.anl.gov
> *Subject:* Re: [mpich-discuss] Integrating parallel and serial code
>
>
>
> 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.
>
> Mike
>
> On Mon, Jul 12, 2010 at 2:57 PM, Hiatt, Dave M <dave.m.hiatt at citi.com>
> wrote:
>
> 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.
>
>
>
> *From:* mpich-discuss-bounces at mcs.anl.gov [mailto:
> mpich-discuss-bounces at mcs.anl.gov] *On Behalf Of *Michael Morrison
> *Sent:* Monday, July 12, 2010 4:52 PM
> *To:* mpich-discuss at mcs.anl.gov
> *Subject:* [mpich-discuss] Integrating parallel and serial code
>
>
>
> 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?
>
> >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.
>
> Thanks for your time,
>
> Mike
>
>
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