[mpiwg-persistence] New meeting of MPI Forum Collective WG

[Skjellum, Anthony]

Agenda for today (this will be on-going, and we will add to/resolve over time)


AGENDA - FEB 11, 2026


  1.
Reconstitution  - subsume partitioned, persistent, point-to-point and collective discussions
  2.
Items for good of the order form participants not covered below
  3.
Align with hybrid/streams work in pt2pt scope

BIG PICTURE AGENDA FOR GROUP, NOT EVERYTHING FOR FIRST MEETING.


  1.
Discuss partitioned collective status and plans
     *
Prior papers
     *
Issues with synchronizing collectives
     *
Prototypes
     *
New ideas with buffer management
     *
Path to standardization

  2.
Corollary issues with persistent collectives
     *
Non-blocking init/free - not allowed

  3.
Related issue - handoff of control of user state
     *
Handling the registration and registration of index vectors and data pointers
     *
C++ way
     *
C (and Fortran) way with registration callbacks at free
     *
Removing ambiguity in the “zero time use case” and whenever a free is allowed to lazy in MPI that holds user state (so it can be released before MPI_Finalize).


  1.
Managing unexpected state in partitioned (and maybe persistent) operations
     *
Elimination of PBUF_PREPARE in all partitioned considerations
     *
Considering to “generalize” point-to-point partitioned to enable a) persistence better; b) buffer pools


  1.
Streaming collectives

  2.
Other things we “owe” short term
     *
MPI_Parrived_any ticket — very useful with current partitioned point-to-point

  3.
Document enhancements
     *
Revamping the collective chapter front-to-back (ask Puri if he had some input on prior tries at this?)
     *
Making uniform the presentation of blocking, nonblocking, persistent, and future (partitioned) collective
     *
Front matter needs a look for terms, definitions…

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Running minutes will be captured and shared.  Recording whenever possible :-)

Anthony Skjellum, PhD
Professor of Computer Science
Director, Advanced Scalable Computing,
              Extreme Networks & Data (ASCEND) Center
Tennessee Technological University
email: askjellum at tntech.edu
cell: +1-205-807-4968



________________________________
From: Skjellum, Anthony
Sent: Friday, February 6, 2026 10:26 AM
To: mpiwg-coll at lists.mpi-forum.org <mpiwg-coll at lists.mpi-forum.org>; mpiwg-persistence at lists.mpi-forum.org <mpiwg-persistence at lists.mpi-forum.org>
Cc: Raffenetti, Ken <raffenet at anl.gov>; Julien.JAEGER at CEA.FR <Julien.JAEGER at CEA.FR>
Subject: New meeting of MPI Forum Collective WG
When: Wednesday, February 11, 2026 9:00 AM-10:00 AM.
Where: Via Zoom

All: Julien Jaeger and I are resuming.  Agenda forthcoming.  Will be every other week, to dovetail with RMA WG.

Tony Skjellum (TNTECH) is inviting you to a scheduled Zoom meeting.

Topic: MPI WG Collective (Persistent too)
Time: This is a recurring meeting Meet anytime
Join Zoom Meeting
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