[mpiwg-p2p] Next meeting: 14th April 2014 11am Central US

[Kenneth Raffenetti]

Is anyone else having trouble connecting to the meeting? I've tried 
multiple machines here at ANL.

On 04/13/2014 05:24 AM, Daniel Holmes wrote:
> Hi all,
>
> The next point-to-point teleconference will be on Monday 14th April 2014
> at 11am Central US via webex.
>
> Connection details are on the p2p wiki.
>
> Agenda:
> 1) Streams: I have some notes - see below - from a discussion last week
> with Bill Gropp, Torsten (et al from the EPiGRAM project)
> 2) Receive_reduce
> 3) Arecv
> 4) AOB (= any other business)
>
> Cheers,
> Dan.
>
> Streams
> =======
> QCDOC developers want persistent channel semantics; actually use
> one-sided, multi-value variables
> Breaking message boundaries enables pipe-lining - makes it fundamentally
> different to RMA?
> Libraries exist to do this - what are they?
> Streaming is well defined in OpenSPL
> Papers from the MPI-2 era (about RMA) suggest writing papers on this and
> getting feedback
> Reach out to other communities, e.g. SKA - Square Kilometre Array
> Should this be added to MPI or added as a library on top - does this
> need small enabling changes
> Bill suggests we craft a broad-visibility paper
> Affects the discussion on Arecv, which would be handled by streams?
> Getting MPI to manage/allocate memory (as in Arecv) is dangerous and bad
>
> Flow-control
> ============
> May just be remote notification and a sequence of messages that remove
> the need for local notification - reduces protocol messages (from 3 to 1
> per message)
> Integral part of streaming - turns global flow-control problem into
> local buffer management
> May address load-imbalance? Hmm
>