[mpiwg-p2p] [EXTERNAL] Re: [Mpi-forum] Point-to-point working group

Mon Feb 3 11:29:28 CST 2014

Hi Jeff,

Is there any particular reason you want the accumulate op to be specified on the Recv side, vs. the send side? I ask because in RMA we have the accumulate specified on the origin. Typically, most networks expose APIs for atomic ops on the origin side as well.

i.e. why not Send_accumulate and Recv.

Thanks,
Sayantan

> -----Original Message-----
> From: mpiwg-p2p [mailto:mpiwg-p2p-bounces at lists.mpi-forum.org] On Behalf
> Of Jeff Hammond
> Sent: Monday, February 03, 2014 8:09 AM
> To: MPI WG Point To Point Communications working group
> Subject: Re: [mpiwg-p2p] [EXTERNAL] Re: [Mpi-forum] Point-to-point working
> group
> 
> I attached everything I have in non-mental form for recv_reduce, which is not a
> huge amount.  The first 23 lines of the C file attached are most useful of what
> I've attached.
> 
> Dave and Jim have already pointed out that my use of generalized requests is
> wrong w.r.t. MPI and instead requires the MPICH extension.
>  That shouldn't really matter since I am providing the implementation on top of
> MPICH only as a reference point for implementers to evaluate the feasibility.
> 
> When I mention the optimized implementation over PAMI, it might be useful to
> reference
> https://bgq1.epfl.ch/navigator/resources/doc/pami/pami_8h_source.html,
> particularly functions associated with pami_data_function.  I don't have a full
> implementation over PAMI but I can describe the performance of one-sided
> streaming accumulate, which is how I will implement this if necessary.
> 
> Best,
> 
> Jeff
> 
> On Mon, Jan 20, 2014 at 9:25 AM, Barrett, Brian W <bwbarre at sandia.gov>
> wrote:
> > Jeff -
> >
> > Thanks for the reminder.  We had a meeting two weeks ago, the notes
> > are on the web page:
> >
> >   https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/PtpWikiPage
> >
> > There's another meeting at 11:00am Central today.  Someone scheduled a
> > meeting I can't reschedule for 10:30 - 11:00 this morning, so I'm
> > going to be 5 minutes late.  Call in information is on the Wiki page.
> >
> > Brian
> >
> > On 1/18/14 9:36 AM, "Jeff Hammond" <jeff.science at gmail.com> wrote:
> >
> >>What's going on with this?
> >>
> >>Jeff
> >>
> >>On Wed, Dec 11, 2013 at 1:27 PM, Barrett, Brian W <bwbarre at sandia.gov>
> >>wrote:
> >>> Hi all -
> >>>
> >>> At the Forum today, progress was made at re-instituting the
> >>>point-to-point  working group.  We'll initially be focusing on the
> >>>point-to-point reduce  and the unknown message size receive problem.
> >>>If you're interested in  joining in, please join the mailing list:
> >>>
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> >>>
> >>> --
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> >>>   Scalable System Software Group
> >>>   Sandia National Laboratories
> >>>
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> >>
> >>--
> >>Jeff Hammond
> >>jeff.science at gmail.com
> >>_______________________________________________
> >>mpiwg-p2p mailing list
> >>mpiwg-p2p at lists.mpi-forum.org
> >>http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-p2p
> >
> >
> > --
> >   Brian W. Barrett
> >   Scalable System Software Group
> >   Sandia National Laboratories
> >
> >
> >
> > _______________________________________________
> > mpiwg-p2p mailing list
> > mpiwg-p2p at lists.mpi-forum.org
> > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-p2p
> 
> 
> 
> --
> Jeff Hammond
> jeff.science at gmail.com