February 2026 - mpiwg-persistence - mailman3.cels.anl.gov

[MPI-Forum] Collective WG meeting today
by Julien.JAEGER＠CEA.FR 25 Feb '26

25 Feb '26

Dear all, MPI Collective WG is meeting today in a bit more than one hour. Please join us to discuss the different topics listed below. 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 https://urldefense.us/v3/__https://tntech.zoom.us/j/85895299644?pwd=UVeoehU… Meeting ID: 858 9529 9644 Passcode: mpi4eva --- One tap mobile +13017158592,,85895299644#,,,,*2477715# US (Washington DC) +13052241968,,85895299644#,,,,*2477715# US Join instructions https://urldefense.us/v3/__https://tntech.zoom.us/meetings/85895299644/invi… -------------------------------- AGENDA - FEB 25, 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… --- Running minutes will be captured and shared. Recording whenever possible :-)

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Re: [mpiwg-persistence] New meeting of MPI Forum Collective WG
by Skjellum, Anthony 11 Feb '26

11 Feb '26

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… --- 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(a)tntech.edu cell: +1-205-807-4968 ________________________________ From: Skjellum, Anthony Sent: Friday, February 6, 2026 10:26 AM To: mpiwg-coll(a)lists.mpi-forum.org <mpiwg-coll(a)lists.mpi-forum.org>; mpiwg-persistence(a)lists.mpi-forum.org <mpiwg-persistence(a)lists.mpi-forum.org> Cc: Raffenetti, Ken <raffenet(a)anl.gov>; Julien.JAEGER(a)CEA.FR <Julien.JAEGER(a)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 https://urldefense.us/v3/__https://tntech.zoom.us/j/85895299644?pwd=UVeoehU… Meeting ID: 858 9529 9644 Passcode: mpi4eva --- One tap mobile +13017158592,,85895299644#,,,,*2477715# US (Washington DC) +13052241968,,85895299644#,,,,*2477715# US Join instructions https://urldefense.us/v3/__https://tntech.zoom.us/meetings/85895299644/invi…

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New meeting of MPI Forum Collective WG
by Skjellum, Anthony 11 Feb '26

11 Feb '26

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 https://urldefense.us/v3/__https://tntech.zoom.us/j/85895299644?pwd=UVeoehU… Meeting ID: 858 9529 9644 Passcode: mpi4eva --- One tap mobile +13017158592,,85895299644#,,,,*2477715# US (Washington DC) +13052241968,,85895299644#,,,,*2477715# US Join instructions https://urldefense.us/v3/__https://tntech.zoom.us/meetings/85895299644/invi…

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Canceled: New meeting of MPI Forum Collective WG
by Skjellum, Anthony 11 Feb '26

11 Feb '26

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 https://urldefense.us/v3/__https://tntech.zoom.us/j/85895299644?pwd=UVeoehU… Meeting ID: 858 9529 9644 Passcode: mpi4eva --- One tap mobile +13017158592,,85895299644#,,,,*2477715# US (Washington DC) +13052241968,,85895299644#,,,,*2477715# US Join instructions https://urldefense.us/v3/__https://tntech.zoom.us/meetings/85895299644/invi…

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New meeting of MPI Forum Collective WG
by Skjellum, Anthony 11 Feb '26

11 Feb '26

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 https://urldefense.us/v3/__https://tntech.zoom.us/j/85895299644?pwd=UVeoehU… Meeting ID: 858 9529 9644 Passcode: mpi4eva --- One tap mobile +13017158592,,85895299644#,,,,*2477715# US (Washington DC) +13052241968,,85895299644#,,,,*2477715# US Join instructions https://urldefense.us/v3/__https://tntech.zoom.us/meetings/85895299644/invi…

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New meeting of MPI Forum Collective WG
by Skjellum, Anthony 06 Feb '26

06 Feb '26

All: Julien Jaeger and I are resuming. Agenda forthcoming. ZOOM INFO TBD, because it will be a recurring meeting with recording.

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