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

Jeff Hammond jeff.science at gmail.com
Mon Feb 3 11:44:38 CST 2014 

This has been discussed in the WG in the past and could have been
addressed on the call had you dialed-in.

Jeff

On Mon, Feb 3, 2014 at 11:29 AM, Sur, Sayantan <sayantan.sur at intel.com> wrote:
> 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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>> >>
>> >>--
>> >>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
>> >
>> >
>> >
>> > _______________________________________________
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>> > mpiwg-p2p at lists.mpi-forum.org
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>>
>>
>> --
>> Jeff Hammond
>> jeff.science at gmail.com
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-- 
Jeff Hammond
jeff.science at gmail.com

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