Ticket 12377 - Make PMIx required by default
Summary: Make PMIx required by default
Status: OPEN
Alias: None
Product: Slurm
Classification: Unclassified
Component: PMIx (show other tickets)
Version: 21.08.0
Hardware: Linux Linux
: 5 - Enhancement
Assignee: Director of Support
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Reported: 2021-08-27 15:32 MDT by Felix Abecassis
Modified: 2024-04-09 15:54 MDT (History)
5 users (show)

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Description Felix Abecassis 2021-08-27 15:32:25 MDT 
As pointed out in https://bugs.schedmd.com/show_bug.cgi?id=12376, you can end up compiling Slurm without PMIx even if the PMIx dev package is installed. Some distros also package Slurm compiled without PMIx support.

In addition, OpenMPI master (which will become 5.0) removed support for PMI/PMI2:
$ ./configure --with-pmi
[...]
configure: WARNING: Open MPI no longer supports PMI-1 or PMI-2 libraries.
configure: WARNING: PMIx is now required. Either the internal version or an
configure: WARNING: external version of PMIx may be used, so long as the
configure: WARNING: external version is compatible with the PMIx v2.2
configure: WARNING: Standard or higher. Note that cross-version support
configure: WARNING: within the OpenPMIx library can be used by this OMPI
configure: WARNING: to interact with environments based on other PMIx
configure: WARNING: versions.
configure: error: Build cannot continue.


To avoid Slurm admins from being in the situation where they realize they need to recompile and re-deploy Slurm with PMIx support in order to support OpenMPI 5.x; we suggest that Slurm starts requiring PMIx by default. Users could still opt-out with --without-pmix if they don't intend to use OpenMPI.