WeeklyTelcon_20210907

Open MPI Weekly Telecon ---

Attendees (on Web-ex)

• Austen Lauria (IBM)
• Brian Barrett (AWS) - Welcome Back!
• David Bernholdt (ORNL)
• Geoffrey Paulsen (IBM)
• George Bosilca (UTK)
• Harumi Kuno (HPE)
• Hessam Mirsadeghi (NVIDIA))
• Jeff Squyres (Cisco)
• Marisa Roman (Cornelius)
• Raghu Raja
• Ralph Castain (Intel)
• Siripaul (Intel)
• Thomas Naughton (ORNL)
• Todd Kordenbrock (Sandia)
• William Zhang (AWS)

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

• Brendan Cunningham (Cornelis Networks)
• Joseph Schuchart (HLRS)
• Josh Hursey (IBM)
• Matthew Dosanjh (Sandia)
• Michael Heinz (Cornelis Networks)
• Sam Gutierrez (LANL)
• Tomislav Janjusic (NVIDIA)
• Akshay Venkatesh (NVIDIA)
• Artem Polyakov (NVIDIA)
• Aurelien Bouteiller (UTK)
• Brandon Yates (Intel)
• Charles Shereda (LLNL)
• Christoph Niethammer (HLRS)
• Edgar Gabriel (UH)
• Erik Zeiske (HPE)
• Geoffroy Vallee (ARM)
• Howard Pritchard (LANL)
• Joshua Ladd (NVIDIA)
• Mark Allen (IBM)
• Matias Cabral (Intel)
• Nathan Hjelm (Google)
• Noah Evans (Sandia)
• Scott Breyer (Sandia?)
• Shintaro iwasaki
• Xin Zhao (NVIDIA)

---

New Topics For Today

v4.0.x

• Schedule: milestone is set for September for 4.0.7
• Howard is out this week.
• MPI_Thread_Init - https://github.com/open-mpi/ompi/pull/9312
  • Need to revert on v4.0.x. Already reverted on v4.1.x
• Use a different mca param for this same functionality
  • https://github.com/open-mpi/ompi/issues/9332
    • In ompi_init. Thread level is an INFO parameter.
    • George will dig into how MCAs affect Info parameters.

v4.1.x

• Merged in a number of things last week. MTT looking pretty good.
• Need to evaluate new v4.1.x based PRs.
• Schedule: milestone is currently (mid-late Sept) for 4.1.2 accumulated bugfixes.

v5.0.x

• Schedule: aiming for rc1 on Sept 23rd.
• Github Project of [critical v5.0.x issues|https://github.com/open-mpi/ompi/projects/3]
  • If we partially disable OSC/TCP BTL - Not breaking MPI compliance, just breaking One-sided performance badly.
    • https://github.com/open-mpi/ompi/pull/8984
    • https://github.com/open-mpi/ompi/issues/7830
    • users could fall back to using UCX or OFI, and not the BTLs.
      • But that's a different can-of-worms
    • Brian will take a look at issues
  • Described approach of rc1 on Sept 23, disabling any functionality that are blockers to allow for the rc.
    • Worried that blockers might not be fixed in time, so will put in code to issue an error at runtime to prevent getting into those paths, and document it heavily.
• MPIAlltoallw needs to go in. Is a PR from Giles George
  • https://github.com/open-mpi/ompi/issues/9329
  • Test has been merged not a fix.
  • https://github.com/open-mpi/ompi/issues/9330
    • George thinks it's ready to go.
• Janjust - has a long outstanding one incomming.
• Portals bugfixes incomming.
• https://github.com/open-mpi/ompi/pull/9326 should get into 5.0 too

Master

• No discussion
• MTT results look pretty good

Documentation

• No update
• Don't do the old system, use this new system for v5.0.0

MPI 4.0 API

• No discussion [Open MPI 4.0 API Compliance Github Project|https://github.com/open-mpi/ompi/projects/2]

MTT

• Looking okay.
• Ciscos results are still hidden by default.

Longer Term discussions

• No discussion.