While we make every effort to keep this list current, it is entirely possible that an environment has recently added PMIx support that we missed and/or don't know about. We welcome suggests/comments on coverage!

• Open MPI: all versions starting with v2.x, as shown below. Note that Open MPI updates its embedded PMIx (staying within the PMIx major release) during the course of a series. For example, Open MPI v3.0.0 might include a copy of PMIx v2.0.0 while Open MPI v3.1.0 might include PMIx v2.1.1.
  • Open MPI v2.x: PMIx v1.2
  • Open MPI v3.x: PMIx v2.x
  • Open MPI v4.x: PMIx v3.x
  Open MPI's internal runtime environment (ORTE) fully supports the embedded PMIx version of each release and can therefore launch and support compatible PMIx-enabled applications (see an explanation of cross-version compatibility here).
• Spectrum MPI: All versions of Spectrum MPI, based on Open MPI, support PMIx, as shown below (* indicates that the release included additional PMIx modifications that were later upstreamed):
  • Spectrum MPI 10.1.0.0 : PMIx 1.1.2*
  • Spectrum MPI 10.2.0.0 : PMIx 2.0.3
  • Spectrum MPI 10.2.0.10 : PMIx 2.2.0
  • Spectrum MPI 10.3.0.0 : PMIx 3.1.2*
• Fujitsu MPI: Further details pending. Last known supported version was PMIx v2.2
• MPICH: Support for PMIx was added in MPICH version 3.3 using the ch4 device configuration. Support is tested regularly against PMIx v2.1. Example configurations include:
  • `--with-device=ch4:ofi [--with-libfabric=path/to/install] --with-pmi=pmix [--with-pmix=path/to/install] --with-pm=no`
  • `--with-device=ch4:ucx [--with-ucx=path/to/install] --with-pmi=pmix [--with-pmix=path/to/install] --with-pm=no`
• HPE-MPI: Further details pending.
• Mellanox HPC-X MPI: HPC-X MPI is based on Open MPI and derives its PMIx portability characteristics from that code base. The following versions of PMIx are supported by HPC-X:
  • HPC-X v1.9: PMIx v1.2
  • HPC-X v2.0: PMIx v2.x
  • HPC-X v2.1: PMIx v2.x
  • HPC-X v2.3: PMIx v2.x
  • HPC-X v2.4: PMIx v3.x

• Reference(Stonybrook): Further details pending. Last known supported PMIx version was v3.x
• Mellanox: HPC-X OpenSHMEM is based on the Open MPI OpenSHMEM implementation. See the HPC-X MPI section for PMIx support details.
• Sandia: SOS supports PMIx starting with the v1.3.4 and v1.4.x releases. All PMIx versions above v2.1.0 are supported
• Oak Ridge Extreme-scale OpenSHMEM (OREO): Further details pending. Currently validated against the PMIx v2.0.3 release

• Slurm (SchedMD): Slurm has support for the PMIx standard in a form of a plugin. This allows Slurm to launch PMIx clients using the ``srun'' launcher if the proper PMIx plugin is specified through an ``--mpi'' parameter as shown below:

  $ srun -N 4 --mpi=pmix ./some-mpi-app

  Slurm/PMIx compatibility has been validated for the following combinations:
  • Slurm v16.05: PMIx v1.x
  • Slurm v17.11: PMIx v1.x, v2.x
  • Slurm v18.08: PMIx v1.x, v2.x, v3.x

  In order to support PMIx, Slurm has to be configured with it using ``--with-pmix'' parameter of the configure script shipped with Slurm distribution. It is possible to specify multiple versions of PMIx simultaneously:

  $ ./configure --with-pmix=<path-to-pmix-vX>[:<path-to-pmix-vY>[:<path-to-pmix-vZ>]] ...

  Only the PMIx versions supported by particular Slurm distribution can be used. In this case the plugin names will have a version suffix, i.e. ``pmix_v1'', ``pmix_v2'', ``pmix_v3'', etc. as shown below:

  $ srun -N 4 --mpi=pmix_v1 ./some-mpi-app # To launch with PMIx v1.x based plugin $ srun -N 4 --mpi=pmix_v2 ./some-mpi-app # To launch the same application with PMIx v2.x

  The list of supported ``mpi'' plugins on the particular system can be found using the srun command, where the ``pmix'' name is an alias to the most recent PMIx version available:

  $ srun --mpi=list

  srun: MPI types are... srun: none srun: pmix_v3 srun: pmix_v2 srun: pmix_v1 srun: pmi2 srun: openmpi srun: pmix

• Job Step Manager (IBM) All versions of the IBM Job Step Manager (JSM) support PMIx, as shown below (* indicates that the release included additional PMIx modifications that were later upstreamed):
  • JSM 10.1.0.0 : PMIx 1.1.2*
  • JSM 10.2.0.0 : PMIx 2.0.3
  • JSM 10.2.0.10 : PMIx 2.2.0
  • JSM 10.3.0.0 : PMIx 3.1.2*:
• Fujitsu: Further details pending. Last known supported version was PMIx v2.2
• ParaStation Management: an RMS developed by ParTec Cluster Competence Center GmbH as part of the ParaStation Modulo tool suite. The suite includes its own MPICH-based MPI implem,entation, a cluster provisioning and management system, a node sanity management framework, and a Trac-based ticket manager. More information on supported PMIx versions will be forthcoming.
• PBSPro (Altair): Upcoming release will target support for traditional wireup interfaces (Put, Commit, Fence, Get), including support for "instant on" operations where available from the network vendor. Long-term plan is to support the full PMIx functional range.

• PMIx Reference RunTime Environment (PRRTE): a runtime environment based on the PMIx Reference Implementation (PRI) and capable of operating within a host SMS. PRRTE provides an easy way of exploring PMIx capabilities and testing PMIx-based applications outside of a PMIx-enabled environment by providing a “shim” between the application and the host environment that includes full support for the PRI. The intent of PRRTE is not to replace any existing production environment, but rather to enable developers to work on systems that do not yet feature a PMIx-enabled host SMS or one that lacks a PMIx feature of interest. PRRTE has been validated to support all PMIx versions at or above v2.0.0.