openpmix 6.0.0 and openMPI 5.0.8 configure problem

[denisbertini]

Trying to install openMPI 5.0.8 with the latest version of PMIX ( v6.0.0 ) i got this configure error:

configure: WARNING: Your PMIx version includes the PMIX_CAP_LTO
configure: WARNING: capability flag. The infrastructure defined
configure: WARNING: within it is not compatible with this version
configure: WARNING: of PRRTE. Please point us at an earlier PMIx
configure: error: Cannot proceed.
configure: ===== done with 3rd-party/prrte configure =====
configure: error: PRRTE configuration failed.  Cannot continue.
```
Does it means that openMPI 5.0.8 is not compatible with the newest version of PMIX?

[hppritcha]

You will need to use an external prrte if you want to use PMIx 6. I suggest trying to use an externally built prrte 4.0.0.

[denisbertini]

humm, why such a complication, why is the delivered PRRTE from v6.0.0 conflicting?
which version is then fully compatible with openMPI ? openPMIX 5.0.8?

[rhc54]

Because there was a community-requested change to the show-help system that requires sync between PRRTE and PMIx. The break is defined to occur at the start of the PRRTE v4 and PMIx v6 series combination.

Things are still fully compatible with OMPI, even the OMPI v5 series. You just have to use external versions of PMIx v6 and PRRTE v4 so that combination is compatible. FWIW, the OMPI v6 series will include that newer combination.

[hppritcha]

OpenPMIx 5.0.8 should be compatible with the PRRTE embedded in the Open MPI 5.0.x releases.

[denisbertini]

Indeed openPMIx 5.0.8 is compatible with openMPI 5.0.x releases, just tested it ...

[ortin-fj]

In my case openPMIx 5.0.8 yielded the same error, but 4.2.9 worked just fine.

[rhc54]

In my case openPMIx 5.0.8 yielded the same error, but 4.2.9 worked just fine.

Not sure I understand that comment - are you saying that PMIx v5.0.8 caused OMPI v5.0.8 to error out of configure? I checked and cannot reproduce such a behavior, and PMIx v5.0.8 definitely does not have the LTO flag. Check to ensure you really are building with the PMIx you think.