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WeeklyTelcon_20201103

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Geoffrey Paulsen edited this page Jan 19, 2021 · 1 revision

Open MPI Weekly Telecon ---

  • Dialup Info: (Do not post to public mailing list or public wiki)

Attendees (on Web-ex)

  • NOT-YET-UPDATED

4.0.x

  • If Openpmix 3.2.1 fixes spawn, may drive.
  • We have PMIx 3.2.1rc1 - should have.
  • Issue about singleton comm-spawn - Used to work, not sure when regression introduced.
    • Nice to get to work
  • Josh will PR PMIx 3.2.1rc today.
  • Howard - get these merged today for MTT tonight.

v4.1

  • In a new position. HAN and Coverity fixes are in.
  • Raghu is taking over for Brian's
  • VERSION,NEWS, and README update is in.
  • RC this week?

Open-MPI v5.0

  • Ralph is working on updating PMIx / PRRTE submodule pointers.

    • Jeff is helping with configury issues.

  • Hoping these are one-time issues, and not every time we update submodule pointers.

    • All new configury.
    • If this isn't a one-time thing, we should consider stop embedding this.
    • Submodules are good for a number of things, but you ahve to take a change in configury, Go through CI, commit it to PMIx master, then go through OMPI CI, and find out that there's a bug. Then you have to go back to PMIx master.

  • Cisco has some of this.

    • Should figure out a keyword on PMIx side, that effectively does

  • Hit a problem in AWS Amazon-Liunux1 trying to build a tarball.

  • And were hitting Mellanox CI due to Python older version.

  • IBM doesn't do dist check - bug is in there (real issue)

  • Some issues are caused by Embedding. (What do you mean by SRCDIR) (Which SRCDIR?)

  • But other issues are NOT caused by embedding pmix.

    • So getting rid of embedding would not solve these issues

  • Not moment it's looking like 2Q next year.

    • IBM's been pushing on PRRTE as well. We're testing the map/bind options.
    • Trying to push tickets up (some are clarification of expected behavior)
    • Community help with these issues would help move forward the prrte deadline.

  • What's going to be the state of the SM Cuda BTL and CUDA support in v5.0?

    • What's the general state? Any known issues?
    • AWS would like to get.

  • Ralph tried the Instant on at scale:

    • 10,000 nodes x 32PPN
    • Ralph verified Open-MPI could do all of that in < 5 seconds, Instant-On.
    • Through MPI_Init() (if using Instant-On)
    • TCP and Slingshot (OFI provider private now)
    • PRRTE with PMIx v4.0 support
    • SLURM has some of the integration, but hasn't taken this patch yet.

  • Discussion on:

    • Draft Request Make default static https://github.com/open-mpi/ompi/pull/8132
    • One con is that many providers hard link against libraries, which would then make libmpi dependent on this.
    • Talking about amending to request MCAs to know if it should be slurped in.
      • (if the component hard links or dlopens their libraries)
    • Roadrunner experiments... The Bottleneck in launching was I/O in loading all the .sos
      • spindle, and burst buffer reduce this, but still
    • Still going through function pointers, no additional inlining.
      • can do this today.
    • Still different than STATIC (sharing this image across process), just not calling dlopen that many times.

Video Presentation

  • George and Jeff are leading
  • No new updates this week (see last week)
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