Need PMIX1.2.1 for v2.1 release

[hppritcha]

This issue tracks getting PMIX2 in the v2.1 release. The shared memory dstore is an important feature when trying to support 100's of MPI processes on a single node.

[hppritcha]

per discussion in Dallas this is being marked as a blocker.

[ggouaillardet]

btw, is this feature working on master now ?
It was disabled because it broke MPI_Comm_spawn, and i do not recall that has been fixed

[jsquyres]

Per discussion with @rhc54 this morning, there is still some development work occurring for PMIx 2.0. After that is complete and merged to master, then it can be ported to v2.1.0.

[jjhursey]

@rhc54 Which branch of PMIx is tracking the PMIx 2.0 effort? I found three references to v2.x in the PMIx set of repos:

• https://github.com/pmix/master/tree/v2.x
• https://github.com/pmix/releases/tree/v2.x
• https://github.com/pmix/releases/tree/release/v2.x

I would be interested in helping test.

[rhc54]

I've been shifting the release tree over to the master repo, just as we did for ompi. However, I can't say for certain that I have it fully up-to-date. I'll get things squared away tomorrow

[rhc54]

@jjhursey I have consolidated the PMIx release branches into the pmix/master repo, and all branches over there are now up-to-date.