WeeklyTelcon_20161220

Open MPI Weekly Telcon

---

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

Attendees

• Geoff
• Ralph
• Howard
• Josh Hursey
• Nathan Hjelm

---

Agenda

Review 1.10

• Milestones: https://github.com/open-mpi/ompi-release/milestones/v1.10.3
• 1.10.5 released!
  • Couldn't do src rpm. Must have been a change or something that broke the RPM spec file.
    • could be something local to machine, dunno.
  • Still 4 or 5 lower priority.

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 *

• Milestones: https://github.com/open-mpi/ompi-release/milestones/v2.0.0 2.0.2 -

  • 1sided stuff - Worked with Mark yesterday, and noticed an assumption in the test.
  • in sort, osc_pt2pt is passing for single threaded (after test case fix)
  • multi-threaded still hanging in heavy order.
    • If a rank has multiple locks outstanding, they can be handled in an arbitrary order on remote side, causing a deadlock.
    • Unclear if this is a test problem (shouldn't put MPI in this situation).
    • Mark gave Josh a pretty small reproducer problem.
  • Josh will get lock, and lock2 test case

  2953 - locks must complete in order?

  • IBM will PR osc mca parameters to disable for thread multiple case.
  • IBM will also PR the current osc_pt2pt fix commits. Single threaded is working, but MT still hangs.

  Howard will close some already merged Issues.

  anything else about 2.0.2 that we should discuss?

  • Howard would want to do an RC2 after we get 1sided in, tomorrow or thursday morning.
  • Then check with Jeff to see if we want a release by end of week.
    • He has a nice checklist to workthrough for

• 2.1 -

  • Did darray fix get into 2.1? Nathan thinks so.

PMIx update

• PMIx 1.2.0 - rc'ed last week, looking good. So decided this morning to release 1.2.0 today.
• Next step is to integrate into OMPI.
  • Original plan was to go into OMPI v2.1, but some discussion we may want it in 2.0.3 to resolve memory issues.

General question

• We have a bunch of sleeps that we do during startup. Totalview has a problem with a bunch of little usleeps.
• Totalview requested that we change usleeps to pthread conditioned waits.
  • In some environments, the pthread library didn't idle the CPUs, just kept using full time-slot.
  • Totalview claims on the systems they run, that is no longer true, that pthread conditioned wait now idles the CPU
  • Nathan says pthread condition waits are implemented in kernel with something that will idle the CPU.

Face2Face in Jan.

• Please sign up.

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

MTT Dev status:

Status Updates:

---

Status Update Rotation

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

---

Back to 2016 WeeklyTelcon-2016