documentation: need to update how-to-build section of Open MPI for the v5.0.0 release

[hppritcha]

We should make sure this table - https://docs.open-mpi.org/en/v5.0.x/installing-open-mpi/required-support-libraries.html?highlight=prrte

before releasing 5.0.0.

We should also add a section about how to support native launch (esp. via srun) with the 5.0.x release stream.

[qkoziol]

@hppritcha @awlauria - Can you progress this?

[hppritcha]

I will update - https://docs.open-mpi.org/en/v5.0.x/launching-apps/slurm.html to be correct. its inaccurate for the 5.0.x and newer releases.

[qkoziol]

I've tried building the 5.0.x branch with:

hwloc: 1.11.0
Libevent: 2.0.21
PMIx: 4.1.2
PRRTE: 2.0.2

as the table in the docs indicates, and the build fails with:

Making all in .
  CC       errhandler/errhandler.lo
  CC       instance/instance.lo
errhandler/errhandler.c:472:10: error: use of undeclared identifier 'PMIX_ERR_PROC_ABORTED_BY_SIG'
    case PMIX_ERR_PROC_ABORTED_BY_SIG:
         ^
1 error generated.
make[2]: *** [errhandler/errhandler.lo] Error 1
make[2]: *** Waiting for unfinished jobs....
instance/instance.c:443:9: error: use of undeclared identifier 'PMIX_ERR_PROC_ABORTED_BY_SIG'
        PMIX_ERR_PROC_ABORTED_BY_SIG,
        ^
1 error generated.
make[2]: *** [instance/instance.lo] Error 1

That error code is from the PMIx 4.2 branch, so I'm going to try building with the PMIx 4.2.4 release candidate next.

INPUT: Is there any reason to try earlier releases from the openpmix 4.2 branch? I would be inclined to tell people to use the latest release from that branch.

[rhc54]

Configure should have error'd out as OMPI v5 requires a minimum of PMIx v4.2.4 and PRRTE v3.0.1 (when released).

[qkoziol]

Configure should have error'd out as OMPI v5 requires a minimum of PMIx v4.2.4 and PRRTE v3.0.1 (when released).

Agree. Is there any reason to allow earlier versions of PRRTE 4.2.x?

[qkoziol]

FYI - I've verified that the 5.0.x branch currently works with PMIx 4.2.4 and PRRTE 2.0.2. I'll check again when we have frozen the branch for code changes before the 5.0 release.

[rhc54]

Errr...there is no way it should work with PRRTE 2.0.2 - nor would you ever want to advise someone to use that combination. You really need PRRTE 3.0.1 as your minimum supported version.