WeeklyTelcon_20160315

Open MPI Weekly Telcon

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

Attendees

• Jeff Squyres
• Geoff Paulsen
• Brad Benton
• Howard
• Josh Hursey
• Nathan Hjelm
• ralph
• Ryan Grant
• Sylvain Jequgey
• Todd Kordenbrock
• Yohann Burette

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Agenda

Review 1.10

• Milestones: https://github.com/open-mpi/ompi-release/milestones/v1.10.3
  • PR 1004 - MPI_Ineighbor_alltoallw
    • Needs reviewer
  • PR 1002 - Memory allocation hooks
    • Jeff to review
  • PR 1006 - Ralph will review.
  • PR 1008 - Jeff already reviewed.
• 1.10.3 in Late April - Some smaller fixes accumulating in the branch
  • Nothing critical at the moment
  • Anyone testing on PSM2 or Omnipath? Intel guys have been. Howard - Ralph check this.

Review 2.0.x

• Wiki: https://github.com/open-mpi/ompi/wiki/Releasev20
• Blocker Issues: https://github.com/open-mpi/ompi/issues?utf8=%E2%9C%93&q=is%3Aopen+milestone%3Av2.0.0+label%3Ablocker
  • Issue 1425 - External PMIx server support
    • Ralph working on a fix - should be quick.
  • Issue 1418 - fix MPI process suicide code
    • Ralph working on a fix - still brewing. Difficult to replicate.
  • Issue 1406 - TCP BTL THREAD_MULTIPLE deadlock
    • Nathan - George is working on a fix, but it is a rewrite. So might take some time.
  • Issue 1353 - -host behavior
    • Ticket has been updated with new commits. Jeff to test.
• Milestones: https://github.com/open-mpi/ompi-release/milestones/v2.0.0
  • PR 1003 - Race condition in process matching thread
    • Nathan to review the patch and sign off.
  • PR 1000 - misc warnings and missing include files
    • Ralph to review and update
  • PR 977 - span on heterogeneous clusters
    • Ralph to review and update
  • PR 973 - Parsing of envvars in MCA
    • Nathan pushing update, Jeff to review after the call.
• Really need more people doing testing on v2.0 branch
• Need some followup discussion about what to do about the TCP BTL...

Misc

• MPI Forum - MPI_Info under discussion
  • Don't propagate infos with MPI_Comm_dup - use MPI_Comm_dup_with_info to propagate infos
  • Still discussion about MPI_Info_get/MPI_Info_set behavior
• Open MPI Developer's Meeting
  • General Notes
  • Geoff Additional Notes
• Nathan - Enabling thread_multiple all the time
  • PR 1397 - always enable MPI_THREAD_MULTIPLE support
  • Should we turn this on for everyone? Generally feeling is to accept this
  • Send another note to the devel list to give folks one last change to comment before commit.
• Need to do some performance testing
  • v2.0.0 better MPI_THREAD_MULTIPLE correctness
  • focus on performance improvements in next v2.X series release

Review Master?

• Remove invisibility for process group - SIGSTOP/SIGCONT delivery
  • PR 1431 - Change process group of children
  • See Open MPI Developer's Meeting notes for some more details.
  • IBM to look at this to see if we need to work it back in. See notes from developers meeting about path forward
• Debug build
  • PR 1417 - warn if this is a debug build
  • Debug build is off by default
  • If you ask for it explicitly then do not issue a warning
• https://github.com/open-mpi/ompi/pull/1417: "RFC: change default build to always be optimized (even for developers)" If no one has any further comments, it's time to merge.

MTT status:

• Really need more people doing testing on v2.0 branch
• One-sided failures seen in nightly testing - Nathan to look at it today
  • Issue 1427 Segmentation fault in Aint tests with IB

Status Updates:

• Cisco
  • v2.0 release engineering
  • General bug fixing and review
• ORNL - N/A
• UTK - N/A
• NVIDIA
  • Getting MTT working and reporting issues as they come up

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Status Update Rotation

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

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