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WeeklyTelcon_20180619

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Geoffrey Paulsen edited this page Jan 15, 2019 · 1 revision

Open MPI Weekly Telecon

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

Attendees

  • Jeff Squyres
  • Geoff Paulsen
  • Joshua Ladd
  • Howard Pritchard
  • akvenkatesh
  • Dan Topa (LANL)
  • Edgar Gabriel
  • Geoffroy Vallee
  • Nathan Hjelm
  • Peter Gottesman (Cisco)
  • Ralph
  • Todd Kordenbrock
  • Xin Zhao

not there today (I keep this for easy cut-n-paste for future notes)

  • David Bernholdt
  • Josh Hursey
  • Brian
  • Thomas Naughton
  • Akvenkatesh
  • Matthew Dosanjh
  • Dan Topa (LANL)

Agenda/New Business

Minutes

Review All Open Blockers

Review v2.x Milestones v2.1.4

  • v2.1.4 - Targeting Late August 31
  • lower priority to v3.0 and v3.1
  • PR5217 changes in OSHMEM logic MPI_Initialized/Finalized
    • IN

Review v3.0.x Milestones v3.0.3

  • Schedule:
    • v3.0.2 has been shipped.
  • v3.0.3 - targeting Sept 1st
    • Do we want AR64 stuff in v3.0.3? - Up to Nathan. Sounds good.
    • Helps IBM too.
    • Cisco is seeing some weirdness in v3.0 and v3.1
      • Haven't nailed down, but haven't reported yet. PMIx / runtime.

Review v3.1.x Milestones v3.1.0

  • v3.1.0 - targeting Sept 1st
  • Last week Brian posted an
  • Brian just merged in a bunch of stuff.
  • OMPIO Issue 5263 - Symbols in an issue in v3.x and master.
    • resolved

v4.0.0

  • Schedule: mid-July branch. mid-Sept relelase.
  • Still working through iWARP issues; LANL waiting for Chelsio RNICs.
    • installed, maybe do some tests in a week or two.
    • mostly smaller issues. Wants to test before do more drastic (like rely only on RDMACM)
  • Howard will ping broadcom - apprise them of situation. Either they do smoke testing with UCX or keep openib only for braodcom.
  • No further / substantive update since last week (4 day weekend prevented a bunch of work this past weekend).
  • PMIx v3.0 RC went into master, but will need another sync before release.
  • PR4618 - Persistant Collectives, Fujitsu is planning to merge into master
    • MPI 4.0 standard is targetting 2020, so these will go in as MPIX until then.
  • OSHMEM Pushed last big OSHEME v1.4
    • Xin Still need to fix up mxm and __
    • Still planning to implement one other portion of the API.
  • favor external vs internal components - hwloc and pmix and libevent.- jeff.
  • Edgar - Did you want to make something default?
    • component is there
    • luster - waiting from George - not sure if going to get OMPIO as default for luster.

PMIx

  • Ralph merged in some PMIx v3.0
    • PR5258 to master - DONE
      • ARM [Pasha] CI was having lots of problems. Upgraded the Atomics in PMIx (some changes).
        • Skeptical itsn't not just a race condition somewhere.
      • Changed both PMIx code and code in Open MPI.
    • Why are we testing ARM? Ralph asked them for help, but no help for a week.

New topics

  • Overall Runtime Discussion (talking v5.0 timeframe, 2019)
    • DELAYED - Geoff Paulsen will send out a seperate email to discuss in approximately two weeks.
  • From last week:
    • What is it that we want? It's changed a bit since last Face to Face.
    • Getting confused about the Goal - Regardless of who and when, lets discuss what.
    • Set up a prep-call
  • What? Two Options:
    1. Keep going on our current path, and taking updates to ORTE, etc.
    2. Shuffle our code a bit (new ompi_rte framework merged with orte_pmix frame work moved down and renamed)
      • Opal used to be single process abstraction, but not as true anymore.
      • API of foo, looks pretty much like PMIx API.
        • Still have PMIx v2.0, PMI2 or other components (all retooled for new framework to use PMIx)
      • to call just call opal_foo.spawn(), etc then you get whatever component is underneath.
      • what about mpirun? Well, PRTE comes in, it's the server side of the PMIx stuff.
      • Could use their prun and wrap in a new mpirun wrapper
      • PRTE doesn't just replace ORTE. PRTE and OMPI layer don't really interact with each other, they both call the same OPAL layer (which contains PMIx, and other OPAL stuff).
        • prun has a lam-boot looking approach.
      • Build system about opal, etc. Code Shufflling, retooling of components.
      • We want to leverage the work the PMIx community is doing correctly.
  • If we do this, we still need people to do runtime work over in PRTE.
    • In some ways it might be harder to get resources from management for yet another project.
    • Nice to have a componentized interface, without moving runtime to a 3rd party project.
    • Need to think about it.
  • Concerns with working adding ORTE PMIx integration.
  • Want to know the state of SLURM PMIx Plugin with PMIx v3.x
    • It should build, and work with v3. They only implemented about 5 interfaces, and they haven't changed.
  • A few related to OMPIx project, talking about how much to contribute to this effort.
    • How to factor in requirements of OSHMEM (who use our runtimes), and already doing things to adapt.
    • Would be nice to support both groups with a straight forward component to handle both of these.
  • Thinking about how much effort this will be. and manage these tasks in a timely manor.
  • Testing, will need to discuss how to best test all of this.
  • ACTION: Lets go off and reflect and discuss at next week's Web-Ex.
    • We aren't going to do this before v4.0 branches in mid-July.
    • Need to be thinking about the Schedule, action items, and owners.

Review Master Master Pull Requests

  • Decided to file PR5200 to begin the long process of deleting osc/pt2pt (by enabling all relevant RDMA BTLs so that every transport will use osc/rdma).
  • Anything Jeff can help with Absoft and NAG licenses?
    • waiting.

Review Master MTT testing

  • Hope to have better Cisco MTT in a week or two

    • Peter is going through, and he found a few failures, which some have been posted.
      • one-sided - nathan's looking at.
      • some more coming.
    • OSC_pt2pt will exclude yourself in a MT run.
      • One of Cisco MTTs runs with env to turn all MPI_Init to MPI_Thread_init (even though single threaded run).
        • Now that osc_pt2pt is ineligible, many tests fail.
        • on Master, this will fix itself 'soon'
        • BLOCKER for v4.0 for this work so we'll have vader and something for osc_pt2pt.
        • Probably an issue on v3.x also.

  • OSHMEM v1.4 - cleanup work

    • and refactoring.

  • Edgar has some issues running on omnipath - Not able to open HFI correctly.

    • Not sure if it's OFI components.
    • Mathias just updated his PR5004 and asked Jeff to review.
      • libfabric related, but probably not Edgar's issue.
    • might be missing coverage here. Results LLNL and cray stuff, not sure what these are.

  • aarch64 and cray master is failing to build with AlltoAllw INTER something.

    • Might be an MPI1 causalty. Several MPI1 cleanup PRs.
    • Giles caught some stuff
    • Leave on here for one more week.

  • Next Face to Face?

    • When? Late summer, early fall?
    • Where? San Jose - Cisco, Albuquerque - Sandia
    • Super computing is in Dallas this year in Nov.

Oldest PR

Oldest Issue

Status Updates:

Status Update Rotation

  1. Mellanox, Sandia, Intel
  2. LANL, Houston, IBM, Fujitsu
  3. Amazon,
  4. Cisco, ORNL, UTK, NVIDIA

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