[mpiwg-rma] RMA WG discussion 12/2014

[Jeff Hammond]

It seems only obvious that remote request completion only makes sense
for large messages where individual completion makes sense.  I can
think of numerous contexts where it does, especially in the limit of
not being able to register an infinity of pages.

Jeff

On Tue, Nov 11, 2014 at 5:49 PM, Jim Dinan <james.dinan at gmail.com> wrote:
> I think the argument against was that can be hard to get fine-grain,
> per-operation remote completion, and harder still to do it efficiently.  So,
> we could end up with an interface that builds a false expectation where
> users expect overlap that many implementations can't provide.
>
>  ~Jim.
>
> On Thu, Nov 6, 2014 at 2:38 AM, Jeff Hammond <jeff.science at gmail.com> wrote:
>>
>> Barrett didn't have a good argument against these functions except
>> argument count, as I recall. There was some debate as to whether nonblocking
>> flush was better, albeit in an apples-to-oranges way.
>>
>> I think most people are just frustrated with the grossness of the corner
>> we are painted into with RMA API. Pirate RMA is the natural consequence of
>> past decisions. The other solution to the application's problem is
>> overlapping windows, which would be only mildly awful if not for our
>> inability to support just one memory model.
>>
>> Jeff
>>
>> Sent from my iPhone
>>
>> > On Nov 6, 2014, at 6:47 AM, "Underwood, Keith D"
>> > <keith.d.underwood at intel.com> wrote:
>> >
>> > So, what, you're telling me I have to start attending again to give you
>> > an appropriate amount of difficulty for some of these proposals?
>> >
>> >> -----Original Message-----
>> >> From: mpiwg-rma [mailto:mpiwg-rma-bounces at lists.mpi-forum.org] On
>> >> Behalf Of Jeff Hammond
>> >> Sent: Tuesday, November 04, 2014 12:39 PM
>> >> To: MPI WG Remote Memory Access working group
>> >> Subject: Re: [mpiwg-rma] RMA WG discussion 12/2014
>> >>
>> >> Pirate RMA (remote request completion - cannot remember ticket number)
>> >> needs to be retired if WG is still not in favor. But then again,
>> >> Barrett is gone :-
>> >> )
>> >>
>> >> Nonblocking RMA epochs in your SC14 paper should be discussed. That
>> >> looks
>> >> promising. Can you create a ticket for it?
>> >>
>> >> Jeff
>> >>
>> >> Sent from my iPhone
>> >>
>> >>> On Nov 4, 2014, at 5:48 PM, William Gropp <wgropp at illinois.edu> wrote:
>> >>>
>> >>> The wiki page already has 397 and I added 460.  Note also that there
>> >>> is a list
>> >> of open tickets on that page; we should try to either adopt or retire
>> >> the open
>> >> ones.
>> >>>
>> >>> Bill
>> >>>
>> >>>> On Nov 4, 2014, at 10:32 AM, Jeff Hammond <jeff.science at gmail.com>
>> >> wrote:
>> >>>>
>> >>>> I would like to discuss
>> >>>> https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/397 and the
>> >>>> closely related
>> >>>> https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/460 in San Jose.
>> >>>>
>> >>>> Can we collect the other tickets of interest to people and ask Martin
>> >>>> for the appropriate allocation of time?
>> >>>>
>> >>>> Thanks,
>> >>>>
>> >>>> Jeff
>> >>>>
>> >>>> --
>> >>>> Jeff Hammond
>> >>>> jeff.science at gmail.com
>> >>>> http://jeffhammond.github.io/
>> >>>> _______________________________________________
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>> >>>> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-rma
>> >>>
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-- 
Jeff Hammond
jeff.science at gmail.com
http://jeffhammond.github.io/