WeeklyTelcon_20171219

Open MPI Weekly Telecon

A few PRs coming through.
Bugfix only mode.
Launchmond / Alliena attach mode - Issue 3660. This mechanism is part of MPIR,
- Ralph fixed in PR4630 - fix the debugger problem.
- Howard wants Jeff to review this change.
Need PR4399 only in v2.x branch.
- Need to have "nice" commit message, good enough
- Now can fix arm tests.
Schedule: January release.

Schedule: Get v3.0.1 out by end of the week.
Duped issue: Mpool init hang AND Current blocker: Hang on ARM in v3.0.x
- Only hangs in debug. Bad, but not ship-stopper.
- Doesn't happen in optimized mode
- Issue 4563 - not seeing on little arm boxes here, Jenkins uses --disable-builtin-atomics.
  - Because when we disable atomics on powerpc, compiler thinks we have cmp-set128.
  - On arm uses old-school lock-based lifo and fifo.
- Fix being worked in PR3988 - bug in PGI compiler
Issue 4509 madvise hook
- Jeff and Howard will discuss.
- Now that we hook madvise, we need to be more careful.
- Nathan hopes his PR 4576 on master would reduce the occurances to 0, but need user to verify.
  - may have to invalidate a LARGE region, even though it's mostly valide just because glibc invalideded a small part of it.
- Tested PR 4576 in master last week,
  - Still need to merge into v2.x, v3.0.x and v3.1.x
Do we need to Pull PR 4628 into v3.0.x?
- broken in v3.0.0 and later, but it's just launch performance not hang.
- decided NOT to block v3.0.1 for this, and fix this in v3.0.2

SCHEDULE: Like to get out in late January
For v3.1.x blockers, please insure they have both "target_x" label, and "blocker" label.
v3.1.0 still has Blocker Issue 4509
- Hope it was fixed in PR 4576 in master tonight, to merge in later.
- Assuming this was fixed (customer didn't reproduce yet)
Dist Graph Create / Tree Create is still segfaulting - but others can't reproduce.
- happens spurradically.
- Issue 4303
- maybe turn it off by default?
- Component in topo, creates graphs when you create a communicator.
- If you get a reproducer, then update ticket and hand to George.
  - Ralph will try to see if he can give George access.

rcache GRDM is hitting an assert in Finalize (refcount on object).
- Nathan will look at.

Seems to be a memory leak in the OMPI Jenkins
- Working on a solution
- Workaround by turnning off pipeline builds.

Brian sent an email earlier this week about News file
- Either we make merging painful for developers, or we create a rather large amount of work for release managers.
- Can automate via Pull Request that ends up in the merge.
- block NEWS: whatever you want NEWS to be.
- With metadata, using Pull Requests, then can change that NEWS block after the fact.
- Would happen at make dist time. Public API calls.
WebEx Schedule: WebEx Next Tuesday Dec19 (unless 0% chance of getting v3.0.1 out)
- Cancel Dec 26,
- Cancel Jan 2nd
Jeff will create new WebEx URL for 2018.