Virtual MPI forum meeting June 7, 2023 / Vote announcement for the July 2023 meeting of the MPI Forum

6 Jun 2023

      Dear MPI forum members,

for the virtual meeting this week (June 7, 2023) the following readings and discussions are scheduled.
Some technical decisions are needed and it may be best to do these decisions as institutional staw votes
in an additional virtual meeting (e.g. next week), rather to do them ad hoc this week.

The topics are #705/PR822,  #710/PR823 with two options,  #676/PR824 or PR825.

Details:
__________________________
#705 Errata: Fortran has only compile-time constants    Rolf,Joseph
     Issue https://github.com/mpi-forum/mpi-issues/issues/705
           (together with https://github.com/mpi-forum/mpi-issues/issues/657   Rolf, Jeff H.)
     PR    https://github.com/mpi-forum/mpi-standard/pull/822
     PDF
     https://github.com/mpi-forum/mpi-standard/files/11450065/mpi41-report_Issue7...

This proposal seems to be already stable.

__________________________
#710 Errata: 'Pending communication' not defined in MPI_Comm_disconnect    Rolf
     Issue https://github.com/mpi-forum/mpi-issues/issues/710
     PR    https://github.com/mpi-forum/mpi-standard/pull/823
     PDF   https://github.com/mpi-forum/mpi-standard/files/11454896/mpi41-report_Issue7...

There is severe critism about the current proposal in PR 823:

  "In this PR here, as far as I can see, the implementations are mainly affected if they
   incorrectly require that there must not be any inactive request handle using the given comm.
   Whether an MPI lib really internally frees the inactive handles or not,
   is mainly a question of having dangling handles or not."
  "Is there broad agreement that this is incorrect implementation behavior? I'm skeptical."

And therefore, there are two different solutions:
  - An advice to users, telling the consequences if they do not free inactive
    handles before calling MPI_Comm_disconnect or MPI_Session_finalize.
or
  - Automatically freeing them.

And furthermore:

  "Whatever we decide, I imagine this needs to extend to MPI_SESSION_FINALIZE as well."

I'll try to update the proposal before the meeting to have text for both possible solutions. 

__________________________
#676 Errata: 'Pending operation' not defined, pending proper definition  Rolf,Joseph
     Issue https://github.com/mpi-forum/mpi-issues/issues/676
     PR    https://github.com/mpi-forum/mpi-standard/pull/824
     PDF   https://github.com/mpi-forum/mpi-standard/files/11668075/mpi41-report_Issue6...

       Substituting "pending operation" by "active operation"

  or PR  https://github.com/mpi-forum/mpi-standard/pull/825
     PDF https://github.com/mpi-forum/mpi-standard/files/11669354/mpi41-report_Issue6...

       Defining "pending operation" as "active operation" (see page 12)

Best regards
Rolf

----- Original Message -----
...
From: "Rolf Rabenseifner" <[email protected]>
To: "Main MPI Forum mailing list" <[email protected]>
Cc: "Christoph Niethammer" <[email protected]>, "Puri Bangalore" <[email protected]>, "Joseph Schuchart"
<[email protected]>
Sent: Wednesday, May 24, 2023 1:36:42 PM
Subject: Re: Update: Vote announcement for the July 2023 meeting of the MPI Forum
...
Martin, Wes, and all,
I expect that we should reserve also June 14, 2023 for a possible continuation
of open questions resulting from the discussions of
...
#705/PR822, #710/PR823, and #676/PR824 are now finalized at least for the
virtual forum meeting, June 7, 2023
and other pending items for MPI-4.1 from the June 7 virtual forum meeting.
Best regards
Rolf
----- Original Message -----
...
From: "Rolf Rabenseifner" <[email protected]>
To: "Main MPI Forum mailing list" <[email protected]>
Cc: "Christoph Niethammer" <[email protected]>, "Puri Bangalore"
<[email protected]>, "Joseph Schuchart"
<[email protected]>
Sent: Thursday, May 11, 2023 8:05:07 PM
Subject: Update: Vote announcement for the July 2023 meeting of the MPI Forum
...
Dear forum members,
#705/PR822, #710/PR823, and #676/PR824 are now finalized at least for the
virtual forum meeting, June 7, 2023, details below:
#705 Errata: Fortran has only compile-time constants    Rolf,Joseph
     Issue https://github.com/mpi-forum/mpi-issues/issues/705
           (together with https://github.com/mpi-forum/mpi-issues/issues/657   Rolf, Jeff
           H.)
     PR    https://github.com/mpi-forum/mpi-standard/pull/822
     PDF
     https://github.com/mpi-forum/mpi-standard/files/11450065/mpi41-report_Issue7...
#710 Errata: 'Pending communication' not defined in MPI_Comm_disconnect    Rolf
     Issue https://github.com/mpi-forum/mpi-issues/issues/710
     PR    https://github.com/mpi-forum/mpi-standard/pull/823
     PDF
     https://github.com/mpi-forum/mpi-standard/files/11454896/mpi41-report_Issue7...
#676 Errata: 'Pending operation' not defined, pending proper definition
   Rolf,Joseph
     Issue https://github.com/mpi-forum/mpi-issues/issues/676
     PR    https://github.com/mpi-forum/mpi-standard/pull/824
     PDF
     https://github.com/mpi-forum/mpi-standard/files/11443976/mpi41-report_Issue6...
The agenda of the virtual meeting should be reading and discussions if needed.
I did the proposals based on the discussion and the major goals:
- backward compatible,
- no performance drawbacks on critical paths,
- full consistency of the solution with all related parts of the MPI standard.
If I have overseen something, then my apologies.
If somebody wants to provide a completely different solution to one of these
issues,
please feel free to do it.
- Thanks to Joseph who did PR 822, which was such a counter proposal for #705.
- This method is often better than doing many change requests for the given PR.
  and it helps to completely check whether it is really consistent over
  all related parts of the MPI standard.
- And thanks for all the comments so far. They really helped me a lot for
preparing the three PRs.
I'll be the next three weeks on vacation.
Best regards
Rolf Rabenseifner
----- Original Message -----
...
From: "Rolf Rabenseifner" <[email protected]>
To: "Main MPI Forum mailing list" <[email protected]>
Cc: "Christoph Niethammer" <[email protected]>, "Puri Bangalore"
<[email protected]>, "Joseph Schuchart"
<[email protected]>
Sent: Tuesday, May 9, 2023 6:07:04 PM
Subject: Vote announcement for the July 2023 meeting of the MPI Forum
...
Dear forum members,
                      (correction: it is for the July 2023 meeting)
I would like to make the following announcements for the next MPI Forum Meeting
(July 10-13, 2023):
- 2nd votes on
   #669 Add operation state 'enabled' and 'local calls' into Terms    Rolf
     Issue https://github.com/mpi-forum/mpi-issues/issues/669
     PR    https://github.com/mpi-forum/mpi-standard/pull/788
#457 Improvements around the word "rank" in the Process Topologies chapter
   Christoph,Rolf
     Issue https://github.com/mpi-forum/mpi-issues/issues/457
     PR    https://github.com/mpi-forum/mpi-standard/pull/804
#485 Fix Incorrect Usage of Rank/Task/etc. in Language Bindings Chapter
   Rolf,Puri
     Issue https://github.com/mpi-forum/mpi-issues/issues/485
     PR     https://github.com/mpi-forum/mpi-standard/pull/803
     PDF
     https://github.com/mpi-forum/mpi-standard/files/10831598/mpi41-report_Issue4...
- errata reading and vote on
#679 Errata: Noncollective (for procedure) and nonpersistent are not defined
   Rolf
     Issue https://github.com/mpi-forum/mpi-issues/issues/679
     PR    https://github.com/mpi-forum/mpi-standard/pull/820
     PDF
     https://github.com/mpi-forum/mpi-standard/files/11432286/mpi41-report_Issue6...
- pre-announcement for errata reading and vote on
 --> See also virtual meeting, June 7, 2023 !!!
#705 Errata: Fortran has only compile-time constants    Rolf,Joseph
     Issue https://github.com/mpi-forum/mpi-issues/issues/705
           (together with https://github.com/mpi-forum/mpi-issues/issues/657   Rolf, Jeff
           H.)
     PR    https://github.com/mpi-forum/mpi-standard/pull/822
#710 Errata: 'Pending communication' not defined in MPI_Comm_disconnect    Rolf
     Issue https://github.com/mpi-forum/mpi-issues/issues/710
     PR    https://github.com/mpi-forum/mpi-standard/pull/823
#676 Errata: 'Pending operation' not defined, pending proper definition
   Rolf,Joseph
     Issue https://github.com/mpi-forum/mpi-issues/issues/676
     PR    https://github.com/mpi-forum/mpi-standard/pull/824
Best regards
Rolf Rabenseifner
--
Dr. Rolf Rabenseifner . . . . . . . . . .. . . [email protected] .
High Performance Computing Center (HLRS) . . . ++49(0)711/685-65530 .
University of Stuttgart . . . . . . www.hlrs.de/people/rabenseifner .
Nobelstr. 19, 70569 Stuttgart, Germany
--
Dr. Rolf Rabenseifner . . . . . . . . . .. . . [email protected] .
High Performance Computing Center (HLRS) . . . ++49(0)711/685-65530 .
University of Stuttgart . . . . . . www.hlrs.de/people/rabenseifner .
Nobelstr. 19, 70569 Stuttgart, Germany
-- 
Dr. Rolf Rabenseifner . . . . . . . . . .. . . [email protected] .
High Performance Computing Center (HLRS) . . . ++49(0)711/685-65530 .
University of Stuttgart . . . . . . www.hlrs.de/people/rabenseifner .
Nobelstr. 19, 70569 Stuttgart, Germany

Rolf Rabenseifner

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