# 3.3. Platform Notes

Error

TODO We should have a canonical list of:

- required 3rd-party package versions supported (PRRTE, hwloc, libevent)

- back-end run-time systems supported (behind PRRTE)

- OS’s and compilers supported

- network interconnects supported.

Open MPI uses both OpenPMIx and PRRTE for its run-time system support, and therefore supports whatever run-time systems they support.

Note

See the PMIx and PRRTE section of the Open MPI documentation for more details about those projects and their relationship to Open MPI.

Each version of Open MPI supports a specific set of versions of OpenPMIx and PRRTE. Those versions therefore determine which run-time systems that a release of Open MPI supports.

- Systems that have been tested are:

  - Linux (various flavors/distros), 64 bit (x86, ppc, aarch64), with gcc (>=4.8.x+), clang (>=3.6.0), Absoft (fortran), Intel, and Portland (be sure to also see the Compiler Notes section)

  - macOS (10.14-10.15, 11.x, 12.x), 64 bit (x86_64) with XCode compilers

- Other systems have been lightly (but not fully) tested:

  - Cygwin 64 bit with gcc

  - ARMv6, ARMv7, ARMv9

  - Other 64 bit platforms.

  - OpenBSD. Requires configure options `--enable-mca-no-build=patcher` and `--disable-dlopen` with this release.

  - Problems have been reported when building Open MPI on FreeBSD 11.1 using the clang-4.0 system compiler. A workaround is to build Open MPI using the GNU compiler.

Note

32-bit environments are no longer supported.

- The run-time systems that are currently supported are:

  - ssh / rsh

  - PBS Pro, Torque

  - Platform LSF (tested with v9.1.1 and later)

  - Slurm

  - Cray XE, XC, and XK

  - Oracle Grid Engine (OGE) 6.1, 6.2 and open source Grid Engine