August 2020 - mpi-forum - mailman3.cels.anl.gov

MPI_Request_free restrictions
by Balaji, Pavan 08 Aug '20

08 Aug '20

Folks, Does someone remember why we disallowed users from calling MPI_Request_free on nonblocking collective requests? I remember the reasoning for not allowing cancel (i.e., the operation might have completed on some processes, but not all), but not for Request_free. AFAICT, allowing the users to free the request doesn’t make any difference to the MPI library. The MPI library would simply maintain its own refcount to the request and continue forward till the operation completes. One of our users would like to free NBC requests so they don’t have to wait for the operation to complete in some situations. Unfortunately, when I added the Rput/Rget operations in the RMA chapter, I copy-pasted that text into RMA as well without thinking too hard about it. My bad! Either the RMA committee missed it too, or they thought of a reason that I can’t think of now. Can someone clarify or remind me what the reason was? Regards, — Pavan MPI-3.1 standard, page 197, lines 26-27: “It is erroneous to call MPI_REQUEST_FREE or MPI_CANCEL for a request associated with a nonblocking collective operation.”

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Re: [Mpi-forum] Virtual meeting recordings dates mixed up
by Wesley Bland 05 Aug '20

05 Aug '20

Hi Ali, You’re right. There was a syntax error in the website that was mixing up some of the dates here. I corrected it and the webpage should be updated soon. Thanks, Wes > On Aug 3, 2020, at 3:53 AM, Ali Omar Abdelazim Mohammed via mpi-forum <mpi-forum(a)lists.mpi-forum.org> wrote: > > Hi all, > > I noticed that the dates of the virtual meetings recordings are mixed up (https://www.mpi-forum.org/virtual_meetings/ <https://www.mpi-forum.org/virtual_meetings/>). For example: > 1. There was no virtual meeting on 22 July, as the meeting was canceled. The recording dated 22 July is for the meeting on 15 July if I am not mistaken. > 2. The entries for the previous exceptional virtual meeting Day 1-3 are on 29 June, 30 June, and 15 July …The third day of the meeting was on 01 July. > > I think we need to modify as follows: > > 15 July, 10:00 - 12:00 - Exceptional Virtual Meeting (Day 3) —> 1 July, 10:00 - 12:00 - Exceptional Virtual Meeting (Day 3) > 22 July, 10:00 - 12:00 - MPI_T / RMA —> 15 July, 10:00 - 12:00 - MPI_T / RMA > > > Best regards, > Ali > > > >> On 2 Aug 2020, at 19:00, mpi-forum-request(a)lists.mpi-forum.org <mailto:[email protected]> wrote: >> >> Send mpi-forum mailing list submissions to >> mpi-forum(a)lists.mpi-forum.org <mailto:[email protected]> >> >> To subscribe or unsubscribe via the World Wide Web, visit >> https://lists.mpi-forum.org/mailman/listinfo/mpi-forum >> or, via email, send a message with subject or body 'help' to >> mpi-forum-request(a)lists.mpi-forum.org >> >> You can reach the person managing the list at >> mpi-forum-owner(a)lists.mpi-forum.org >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of mpi-forum digest..." >> >> >> Today's Topics: >> >> 1. Final Reminder: Deadline for Ballots, Readings, ... for the >> August MPI Forum Meeting is Tomorrow/Monday (Martin Schulz) >> 2. Re: Final Reminder: Deadline for Ballots, Readings, ... for >> the August MPI Forum Meeting is Tomorrow/Monday (Martin Schulz) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Sun, 2 Aug 2020 16:14:41 +0200 >> From: Martin Schulz <schulzm(a)in.tum.de> >> To: "Jeff Squyres (jsquyres) via mpi-forum" >> <mpi-forum(a)lists.mpi-forum.org> >> Subject: [Mpi-forum] Final Reminder: Deadline for Ballots, Readings, >> ... for the August MPI Forum Meeting is Tomorrow/Monday >> Message-ID: <59BB2A3F-AEAF-48DD-B92B-850C81B589CF(a)in.tum.de> >> Content-Type: text/plain; charset=utf-8 >> >> Hi all, >> >> Just as the usual reminder - tomorrow is the 2 week mark for our extra August meeting - please send any announcements for ballots, readings, etc. to the list by tomorrow / Monday. >> >> Thanks! >> >> Martin >> >> >> ? >> Prof. Dr. Martin Schulz, Chair of Computer Architecture and Parallel Systems >> Department of Informatics, TU-Munich, Boltzmannstra?e 3, D-85748 Garching >> Member of the Board of Directors at the Leibniz Supercomputing Centre (LRZ) >> Email: schulzm(a)in.tum.de >> >> >> >> ------------------------------ >> >> Message: 2 >> Date: Sun, 2 Aug 2020 16:17:15 +0200 >> From: Martin Schulz <schulzm(a)in.tum.de> >> To: Main MPI Forum mailing list <mpi-forum(a)lists.mpi-forum.org> >> Subject: Re: [Mpi-forum] Final Reminder: Deadline for Ballots, >> Readings, ... for the August MPI Forum Meeting is Tomorrow/Monday >> Message-ID: <2B2F7E1F-E600-460C-B6AE-D6949A374F40(a)in.tum.de> >> Content-Type: text/plain; charset="utf-8" >> >> Hi all, >> >> I will be reading the errata issue #169 (together with the matching ballot). Topic: MPI_File_read equivalency >> >> https://github.com/mpi-forum/mpi-issues/issues/169 <https://github.com/mpi-forum/mpi-issues/issues/169> >> >> Thanks, >> >> Martin >> >> >> ? >> Prof. Dr. Martin Schulz, Chair of Computer Architecture and Parallel Systems >> Department of Informatics, TU-Munich, Boltzmannstra?e 3, D-85748 Garching >> Member of the Board of Directors at the Leibniz Supercomputing Centre (LRZ) >> Email: schulzm(a)in.tum.de >> >>> On 2. Aug 2020, at 16:14, Martin Schulz via mpi-forum <mpi-forum(a)lists.mpi-forum.org> wrote: >>> >>> Hi all, >>> >>> Just as the usual reminder - tomorrow is the 2 week mark for our extra August meeting - please send any announcements for ballots, readings, etc. to the list by tomorrow / Monday. >>> >>> Thanks! >>> >>> Martin >>> >>> >>> ? >>> Prof. Dr. Martin Schulz, Chair of Computer Architecture and Parallel Systems >>> Department of Informatics, TU-Munich, Boltzmannstra?e 3, D-85748 Garching >>> Member of the Board of Directors at the Leibniz Supercomputing Centre (LRZ) >>> Email: schulzm(a)in.tum.de >>> >>> _______________________________________________ >>> mpi-forum mailing list >>> mpi-forum(a)lists.mpi-forum.org >>> https://lists.mpi-forum.org/mailman/listinfo/mpi-forum >> >>

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August 2020 Meeting Registration Page
by Wesley Bland 04 Aug '20

04 Aug '20

Hi all, Registration for the August 2020 Meeting is now open. Details are on the logistics page on the website, but the link you need to register is here: https://forms.gle/WbmoWm1iMdWS2QEX7 <https://forms.gle/WbmoWm1iMdWS2QEX7> As always, you must be registered in order to attend and vote. In particular, voting eligibility is cut off after the first voting block, which is scheduled for 11:30am Central US time on Monday, August 17. That essentially means that there will be no late registration allowed. If you have any questions or concerns, please let me know. Thanks, Wes

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Re: [Mpi-forum] No Virtual Meeting Tomorrow (Wed) / August Agenda Online
by Martin Schulz 04 Aug '20

04 Aug '20

Hi Guillaume, Sorry about that - fixed. Thanks, Martin — Prof. Dr. Martin Schulz, Chair of Computer Architecture and Parallel Systems Department of Informatics, TU-Munich, Boltzmannstraße 3, D-85748 Garching Member of the Board of Directors at the Leibniz Supercomputing Centre (LRZ) Email: schulzm(a)in.tum.de > On 4. Aug 2020, at 21:46, Guillaume Mercier via mpi-forum <mpi-forum(a)lists.mpi-forum.org> wrote: > > > Hi Martin, > > My errata reading seems to be missing from the agenda. > > Guillaume > > On 8/4/20 9:32 PM, Martin Schulz via mpi-forum wrote: >> Hi all, >> >> The virtual meeting tomorrow (Wed 8/5) is - as expected - cancelled. >> >> Also, based on the input I have gotten, I published a first agenda for the August Voting Meeting on the MPI Forum webpage. Please take a look and let me know if I missed anything. Also, if there are any additional items for plenary discussion that should be included, please let me know - as of now, there should be time available. >> >> Thanks! >> >> Martin >> >> >> >> — >> Prof. Dr. Martin Schulz, Chair of Computer Architecture and Parallel Systems >> Department of Informatics, TU-Munich, Boltzmannstraße 3, D-85748 Garching >> Member of the Board of Directors at the Leibniz Supercomputing Centre (LRZ) >> Email: schulzm(a)in.tum.de >> >> _______________________________________________ >> mpi-forum mailing list >> mpi-forum(a)lists.mpi-forum.org >> https://lists.mpi-forum.org/mailman/listinfo/mpi-forum >> > > _______________________________________________ > mpi-forum mailing list > mpi-forum(a)lists.mpi-forum.org > https://lists.mpi-forum.org/mailman/listinfo/mpi-forum

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Re: [Mpi-forum] No Virtual Meeting Tomorrow (Wed) / August Agenda Online
by Guillaume Mercier 04 Aug '20

04 Aug '20

Hi Martin, My errata reading seems to be missing from the agenda. Guillaume On 8/4/20 9:32 PM, Martin Schulz via mpi-forum wrote: > Hi all, > > The virtual meeting tomorrow (Wed 8/5) is - as expected - cancelled. > > Also, based on the input I have gotten, I published a first agenda for the August Voting Meeting on the MPI Forum webpage. Please take a look and let me know if I missed anything. Also, if there are any additional items for plenary discussion that should be included, please let me know - as of now, there should be time available. > > Thanks! > > Martin > > > > — > Prof. Dr. Martin Schulz, Chair of Computer Architecture and Parallel Systems > Department of Informatics, TU-Munich, Boltzmannstraße 3, D-85748 Garching > Member of the Board of Directors at the Leibniz Supercomputing Centre (LRZ) > Email: schulzm(a)in.tum.de > > _______________________________________________ > mpi-forum mailing list > mpi-forum(a)lists.mpi-forum.org > https://lists.mpi-forum.org/mailman/listinfo/mpi-forum >

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No Virtual Meeting Tomorrow (Wed) / August Agenda Online
by Martin Schulz 04 Aug '20

04 Aug '20

Hi all, The virtual meeting tomorrow (Wed 8/5) is - as expected - cancelled. Also, based on the input I have gotten, I published a first agenda for the August Voting Meeting on the MPI Forum webpage. Please take a look and let me know if I missed anything. Also, if there are any additional items for plenary discussion that should be included, please let me know - as of now, there should be time available. Thanks! Martin — Prof. Dr. Martin Schulz, Chair of Computer Architecture and Parallel Systems Department of Informatics, TU-Munich, Boltzmannstraße 3, D-85748 Garching Member of the Board of Directors at the Leibniz Supercomputing Centre (LRZ) Email: schulzm(a)in.tum.de

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Announcing/Reconfirming 2nd Vote on Ticket #137 - Enbiggenment (Large Counts)
by Anthony Skjellum 04 Aug '20

04 Aug '20

Hi, this is the two-week vote announcement for Ticket #137, which is already on the agenda. Issue: https://github.com/mpi-forum/mpi-issues/issues/137 Pull request: https://github.com/mpi-forum/mpi-standard/pull/132 PDF: https://github.com/mpi-forum/mpi-issues/files/5022345/mpi40-report-ticket13… One outstanding issue is being discussed, and there may be no-no vote proposed also, tbd. Thanks, Tony and Puri on behalf of the Large Counts WG. -- Anthony Skjellum, PhD skjellum(a)gmail.com Cell: +1-205-807-4968

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Errata vote for the Tools WG
by Hermanns, Marc-André 04 Aug '20

04 Aug '20

Hi all, sorry for announcing this a tat late. I am currently on vacation. The tools WG would like to read and vote on the Erratum ticket 268: Title: Clarification: Section 14.3.7 - p. 615 - MPI_T Session Impact Clarifications Issue: https://github.com/mpi-forum/mpi-issues/issues/268 PR: https://github.com/mpi-forum/mpi-standard/pull/168 Cheers, Marc-Andre -- Dr. rer. nat. Marc-André Hermanns IT Center Group: High Performance Computing Division: Computational Science and Engineering RWTH Aachen University Seffenter Weg 23 52074 Aachen Phone: +49 241 80-24381 hermanns(a)itc.rwth-aachen.de www.itc.rwth-aachen.de

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Reading and Vote Announcements for August 2020 MPI Forum Meeting
by Wesley Bland 03 Aug '20

03 Aug '20

Hi all, Sorry to get these in at the last minute. I was on vacation for the past few weeks and am just getting back in. I have three announcements this time: Errata Reading and Vote - Clarification: Section 11.7 - p. 482 - MPI Exception Clarification Issue - https://github.com/mpi-forum/mpi-issues/issues/263 <https://github.com/mpi-forum/mpi-issues/issues/263> Pull Request - https://github.com/mpi-forum/mpi-standard/pull/177 <https://github.com/mpi-forum/mpi-standard/pull/177> This was read last time, but failed the no-no after Jeff Squyres rightly pointed out a problem with the text. That has now been corrected and this errata item will be re-read and re-voted. 1st Vote - Clarification: Section 8.5 - p. 377 - Error Class and Code Advice to Implementors Issue - https://github.com/mpi-forum/mpi-issues/issues/259 <https://github.com/mpi-forum/mpi-issues/issues/259> Pull Request - https://github.com/mpi-forum/mpi-standard/pull/178 <https://github.com/mpi-forum/mpi-standard/pull/178> This had a minor no-no reading at the last meeting, which was already voted in, and is ready to go for the first vote. Full Reading - Add MPI_Remove_error_class, MPI_Remove_error_code, MPI_Remove_error_string Issue - https://github.com/mpi-forum/mpi-issues/issues/283 <https://github.com/mpi-forum/mpi-issues/issues/283> Pull Request - https://github.com/mpi-forum/mpi-standard/pull/166 <https://github.com/mpi-forum/mpi-standard/pull/166> This was intended to be read at the previous meeting but was somehow left out. It will be read this time. Both of the last two items are currently marked for MPI 4.1, but they can go into whichever version of the standard is next ready. Thanks, Wes

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Reading for Synchronization on Partitioned Communication for Accelerator Optimization - Issue #302
by Grant, Ryan Eric (-EXP) 03 Aug '20

03 Aug '20

Hi Everyone, We would like to announce the following reading for the next MPI Forum meeting: Synchronization on Partitioned Communication for Accelerator Optimization - Issue #302. This introduces explicit synchronization to allow for optimization on accelerator (e.g. GPU) type devices. This ticket addresses the issues discussed in the last virtual forum meeting (non-voting) on July 29th (link to recording: https://youtu.be/__y9yLCVN98 part comm discussion begins at 49:30?). Issue: https://github.com/mpi-forum/mpi-issues/issues/302 Pull Request: https://github.com/mpi-forum/mpi-standard/pull/264 Diff in github: https://github.com/mpi-forum/mpi-standard/compare/1caba35..9fa1e9f Thanks, Ryan

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