July 2022 - mpiwg-rma - mailman3.cels.anl.gov

RMA WG meeting today
by Joseph Schuchart 28 Jul '22

28 Jul '22

The RMA WG will meet today at 10am Central / 11am Eastern / 5pm Central European time. We will continue to discuss issues and proposals for the 4.1 cycle. https://github.com/mpiwg-rma/mpi-standard/pull/7 As usual, the meeting info can be found at https://github.com/mpiwg-rma/mpi-standard/wiki (ping me if you get a 404 and I will add you to the github group). See you then Joseph

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Re: [mpiwg-rma] RMA WG Meeting today
by Joseph Schuchart 21 Jul '22

21 Jul '22

The RMA WG will meet today at 10am Central / 11am Eastern / 5pm Central European time. Topics to discuss are the open issues for 4.1, in particular the proposal to relax the constraints on MPI_Win_shared_query: https://github.com/mpiwg-rma/mpi-standard/pull/7 Note that we're trying to move to a weekly schedule and this is the first meeting in the off-week. As usual, the meeting info can be found at https://github.com/mpiwg-rma/mpi-standard/wiki (ping me if you get a 404 and I will add you to the github group). See you then Joseph

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Fwd: [Mpi-forum] Virtual MPI Forum Meeting Tomorrow (ACTION ITEMS INCLUDED)
by Joseph Schuchart 19 Jul '22

19 Jul '22

As per last week's discussion, it seemed that most of the issues that are tagged for 4.1 [1] won't have anyone to work on. An exception is #23 (relax constraints on MPI_Win_shared_query), for which we have a PR in the WG Github repo based on Jeff's proposal [2]. In particular, I would love to see progress on the issues around atomic operations for 4.1 (#114 and #36). If anyone is willing to lead the efforts for this or any of the other issues in the TODO column in [1] we'd be happy to discuss and assist. Please send me an email if you are interested in pursuing one of the issues so we can include it in our discussion at the Forum meeting tomorrow. Otherwise we will probably have to move them to 5.0. I did not hear any objections to a weekly schedule so I suggest we meet again on Thursday. I will send out the usual reminder before the meeting. Cheers Joseph [1] https://github.com/orgs/mpi-forum/projects/1/views/1?filterQuery=wg-rma [2] https://github.com/mpiwg-rma/mpi-standard/pull/7 -------- Forwarded Message -------- Subject: [Mpi-forum] Virtual MPI Forum Meeting Tomorrow (ACTION ITEMS INCLUDED) Date: Tue, 19 Jul 2022 06:23:34 +0200 From: Martin Schulz via mpi-forum <mpi-forum(a)lists.mpi-forum.org> Reply-To: Main MPI Forum mailing list <mpi-forum(a)lists.mpi-forum.org> To: Wes Bland via mpi-forum <mpi-forum(a)lists.mpi-forum.org> CC: Martin Schulz <schulzm(a)in.tum.de> Hi all, After some break, we’ll have an MPI Forum Virtual Meeting tomorrow at the usual time – 10am CT – and using the usual link, which is on github at the usual place. As mentioned before, the goal tomorrow is get an overview of the state in the various working groups and chapter committees in our progress to MPI 4.1. We will use this to build a todo/gating issues list during the September meeting and with that plan a (hopefully) concrete timeline for MPI 4.1. However, this means that we need your input on two things: * The status of the open items on the github boards (see Wesley’s email from July 6^th ) * Any open issues from the WGs that should be considered for MPI 4.1 (or which ones can be postponed to MPI 5.0) (keep in mind, though, MPI 4.1 was not supposed to include major items or additions, just cleanup and minor urgent changes) Therefore, I would like to ask all of to review these items above (especially if you are tagged on one of the items on the github boards). Also, it would be really helpful, if each WG lead would be able to join us tomorrow or have a representative, so we can discuss the open issues. For reference, here are the links to the boards: * https://github.com/mpi-forum/mpi-issues/projects/3 (GitHub’s old project boards version) * https://github.com/orgs/mpi-forum/projects/1/views/2 (GitHub’s new project boards version) Thanks and hopefully see/hear you all tomorrow, 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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Re: [mpiwg-rma] RMA WG Meeting today
by Joseph Schuchart 14 Jul '22

14 Jul '22

All, We went over the open issues in the MPI Forum github project for the 4.1 cycle today. It seems that while there is a general consensus that some of these issues should be fixed rather sooner than later there also seems to be a lack of bandwidth to drive them. In particular, I have moved the issues surrounding atomics to 5.0 because the people driving them have moved on and the time left for 4.1 is short [2, 3]. If anyone wants to drive any of these issues for 4.1 please let me know, I'll be happy to assist :) As mentioned in my earlier mail, I'd like to move to a weekly schedule. Not everyone was on the call today so we punted on it. Please let me know if a weekly meeting in that same slot won't work for you in general (there will always be conflicts from time to time, of course). See you at the Forum meeting next week, Joseph [1] https://github.com/orgs/mpi-forum/projects/1/views/1?filterQuery=label%3Awg… [2] https://github.com/mpi-forum/mpi-issues/issues/114 [3] https://github.com/mpi-forum/mpi-issues/issues/36 On 7/14/22 08:15, Joseph Schuchart wrote: > The RMA WG will meet today at 10am Central / 11am Eastern / 5pm > Central European time. I'd like to see if we can move to a weekly > schedule so we have enough time to discuss all the open topics. Please > check if your schedule allows for meeting weekly in the same slot. I'd > like to go over the open items in the MPI 4.1 Github project to > prepare for next week's meeting: > > https://github.com/orgs/mpi-forum/projects/1/views/1?filterQuery=label%3Awg… > > > I created a PR from Jeff's draft on allowing MPI_Win_shared_query for > windows other than shared memory windows: > > https://github.com/mpiwg-rma/mpi-standard/pull/7 > > As usual, the meeting info can be found at > https://github.com/mpiwg-rma/mpi-standard/wiki (ping me if you get a > 404 and I will add you to the github group). > > See you then > Joseph

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RMA WG Meeting today
by Joseph Schuchart 14 Jul '22

14 Jul '22

The RMA WG will meet today at 10am Central / 11am Eastern / 5pm Central European time. I'd like to see if we can move to a weekly schedule so we have enough time to discuss all the open topics. Please check if your schedule allows for meeting weekly in the same slot. I'd like to go over the open items in the MPI 4.1 Github project to prepare for next week's meeting: https://github.com/orgs/mpi-forum/projects/1/views/1?filterQuery=label%3Awg… I created a PR from Jeff's draft on allowing MPI_Win_shared_query for windows other than shared memory windows: https://github.com/mpiwg-rma/mpi-standard/pull/7 As usual, the meeting info can be found at https://github.com/mpiwg-rma/mpi-standard/wiki (ping me if you get a 404 and I will add you to the github group). See you then Joseph

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discuss MPI_WIN_SHARED_QUERY
by Jeff Hammond 04 Jul '22

04 Jul '22

I would like to discuss MPI_WIN_SHARED_QUERY ( https://github.com/mpi-forum/mpi-issues/issues/23) in a future call. In the past, Bill had issues with this because it would encourage (but not require) implementations to allocate contiguous shared memory in MPI_Win_allocate, whereas today it might allocate noncontiguous shared memory. I'm not sure if any implementation is actually doing the latter, but I believe this is not a serious issue, since (1) implementations are not required to change (2) Linux NUMA balancing is a thing now. I will also note that I started sketching out a proposal to construct windows better - https://github.com/mpiwg-rma/rma-issues/issues/22 - that might be a way to escape a lot of the current problems with RMA having way too many features. Jeff

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