WeeklyTelcon_20170926

Open MPI Weekly Telcon

Going to switch v2.0.x to only Critical fixes only!
- Only Critical fix we know of now is MAdvise fix.
Ask people to move to v2.1.x or v3.0.0
If nothing else critical Howard and Jeff will make an RC soon.
targeting Oct 21st for release.
Should be pretty easy.

v2.1.3 (unscheduled, but probably jan 19, 2018)
- PR4172 - a mix between feature / bugfix.

v3.0.1 - Opened the branch for bugfixes Sep 18th.
- Looking at Oct 17th
ortedvm is broken on v3.0.0
- Discussed and pushing to v3.1 due to high number of orted changes.

Plan to branch from Master moved to Tuesday Oct 3rd.
Plan to create first RC Tuesday Oct 3rd after branching.
gives us 4 weeks to stabilize and release before supercomputing.
PMIx 2.1 should get in in time for v3.1
- One new feature is cross version compatibility.
- PMIx version 2.x will support one step back, PMIx v1.x Not sure if it support v1.0 and v1.1 and v1.2
- Discuss next week exactly what this supports.
- useful for slurm build with older PMIx.

proc_hostname code not coded correctly for 3 years. git bisect from PMIx from 2 weeks ago
- Giles posted a fix
- Someone from PMIX should look at, was this a latent bug that brought forward, or were we just getting lucky?
- Does this affect other branches? Other branches also didn't initialize proc_hostname to NULL.
- Segfaults in Finalize (teardown in proc, tries to free a bogus value
Related issue: Also discuss preventative programming with calloc vs malloc for proc_hostname type future issues.
- discussion on devel mailing list. Need to understand.

Howard having issues with reaching out and getting ID from MTT. Josh isn't sure.
- Josh had a breakthrough on Python Client.
Python 3 users will need this PR to try: https://github.com/open-mpi/mtt/pull/561
- Please try out Python Client if you can.
- This is the future, just a matter of time before everyone should switch.
Other than Cisco's new proc_hostname issue, looking pretty good.
Artem is seeing an Out of Resource error (filesystem) on AWS.
- Boris will try to reproduce this, but if can't reproduce, it would be nice if AWS could check what is leftover there.
- Error appears at fallocate(), using it to reserve space for dstore. Get contents of directory.
- Probably not file descriptor.

C++ removal - https://github.com/open-mpi/ompi/pull/1389
- If we Pull, it would cause a major version bump, but don't want this to drive a major version bump.

Need to see if Attributes are MT - IBM will see if we have any tests to audit.
- Asked, need to get answer back from them.