[Mpi-forum] MPI "Allocate receive" proposal

[Jeff Hammond]

When does this actually improve performance?  If memory is a limiting
factor, it merely eliminates a function call.  If memory is limiting, I
don't see how doing extra ping-pong to keep from hitting OOM errors is
noticeable.

JeffS and Dave: What's the use case?  So far, I fail to see how this is
more than icing.

Jeff


On Mon, Aug 26, 2013 at 12:55 PM, Sur, Sayantan <sayantan.sur at intel.com>wrote:

> This is a good feature to have in general that improves performance,
> although the devil is in the details.
>
> What is the app trying to do when it finds itself in the quandary of
> having to accept any sized message (probably from any source as well?). It
> appears to me that the kind of app that is looking for this feature, or
> could benefit from this feature is really looking for a many-to-one (or
> one-to-one, many-to-many) reliably connected stream. It is likely that the
> app that benefits significantly from this feature will be repeatedly using
> this call to fetch differing amounts of data each time.
>
> A few meetings ago, Bill mentioned that it would be good to think of the
> standard as a whole and not get bogged down in narrow use-cases. He
> proposed that a streaming model be added to MPI P2P communications. Can
> this use-case be included in that model?
>
> Thanks,
> Sayantan
>
>
> > -----Original Message-----
> > From: mpi-forum [mailto:mpi-forum-bounces at lists.mpi-forum.org] On
> > Behalf Of Jeff Squyres (jsquyres)
> > Sent: Monday, August 26, 2013 8:11 AM
> > To: MPI Forum list
> > Subject: [Mpi-forum] MPI "Allocate receive" proposal
> >
> > Dave Goodell and I have a proposal that we've socialized a bit around
> with
> > other Forum members, and would now like larger Forum feedback.  I'll be
> > presenting the attached slides on the concept of an "allocate receive" in
> > Madrid (3:30-4pm on Thursday).
> >
> > There's no text or ticket yet; this is an idea that we want to get
> feedback on
> > before working up a full proposal.
> >
> > --
> > Jeff Squyres
> > jsquyres at cisco.com
> > For corporate legal information go to:
> > http://www.cisco.com/web/about/doing_business/legal/cri/
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>



-- 
Jeff Hammond
jeff.science at gmail.com
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