WeeklyTelcon_20160719

Open MPI Weekly Telcon

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

Attendees

• Geoff Paulsen
• Jeff Squyres
• Artem Polyakov
• Brian
• Edgar Gabriel
• Howard
• Josh Hursey
• Nathan Hjelm
• Ralph
• Ryan Grant
• Todd Kordenbrock

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Agenda

Review 1.10

• Milestones
• A couple of things sitting against 1.10.4

Review 2.0.x

• Wiki
• 2.0.1 PRs that are reviewed and approved
  • v2.0.1 PRs are open. Need to get PRs reviewed!
• Blocker Issues *
• Milestones
• We release last Tuesday. Now taking in PRs.
• A lot of 2.0.1 PRs that did not get reviewed yet, so please get reviews.
• Howard and Jeff merging in low risk ones.
• nvidia failures with OFED install (false failures)
• cisco failures - still some failures here. Have to do with sparse groups. One of the PRs we haven't pulled in yet.
• IBM seem to do with spawn an intercomm interconnect
  • Might call Connect / Accept - when we create key, we use PMIx to communicate between leaders.
  • PMIX needs to support Exchange.
  • Aborts but Hangs. - PMIx error code is coming up.
• Cray - all associated with SPAWN, but CRAY PMI doesn't support it.
• Applaunch with Master doesn't work
• MPI_Info keys are weird. OMPI_NUM_APPS? what is that?
• Mellanox will host EventBright (vendor process fees). Thank you Mellanox.

Review Master MTT testing (https://mtt.open-mpi.org/)

MTT Dev status:

New Items:

• Gentle reminder that lots of 2.0.1 PRs haven't been reviewed yet.

• Merging github master and ompi_release is taking a backseat to migraion.

• Migration ongoing, nothing's moved yet, just testing:

  • Mailman lists - sanity check of list of lists that we are migrating, and not-migrating.
    • if Community is good with list of lists, then give everyone a heads up that it's moving.
    • new aliases will be @lists.openmpi-org.
  • Transfer MTT to Ralph's machine to address PostGRES issue, before transitioning.
    • MTT code is somewhat POSTGRES specific. But Hostgator support MYSQL, but not POSTGRES.
    • So need to modify code from POSTGRES to MYSQL.
    • So Intel is temporarily migrating MTT Sever until we can migrate to MYSQL.
    • meeting with MTT to guestimate the time... few months of realistic effort.
    • Mostly API issue, though some POSTGRES specific tables. That will need to change. Database structure won't have to change.
  • moving main website. Mostly a solved issue. Want to do mailing list stuff first.
  • PDFs for 3rd party agreements. Ralph talked to Hostgator, they have a file sharing that increases price dramatically.
    • If only one or two people have access, and have permission on HostGator, perhaps this is acceptable.

New discussion.

• Mellanox Jenkin's - Some jenkin's testing that was failling in MPI_Init, not sure if new MELLANOX Seed.
  • Will look into. Server was rebooted, they are doing some maintenance. Perhaps this is causing issues.
  • Jeff tagged Artem in PR in last few hours.
• Possible to put a :bot-mellanox-retest: on Mellanox Jenkins
  • Artem will try.
• Howard pointed out yesterday. Jeff did a bot-retest of old 2.0.1 PRs, because he thought they'd be done in serial. But Mellanox config says it will run 10 in parallel
• Artem - discuss benchmarks.

Artem new benchmarking.

• Test blocking versus non-blocking MPI_Send/Recv -
  • could run 16 processes per node, and pair processes on two nodes to send back and forth.
  • Or could run 1 process per node, and run 16 threads, and do the same thing.
  • would expect this to be similar, but in reality, it is very different (16 threads is much worse).
  • So this is one of the questions to discuss?

Status Updates:

1. Mellanox
   • Artem sent out message rate email.
2. Sandia
3. Intel

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Status Update Rotation

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

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