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The Open MPI feature is only available with Domino versions 5.1.1 and later. Previous versions of Domino do not support this feature.
For each minor release, Domino performs validation tests on a specific version of Open MPI. These tests cover the integration surface between the Domino platform and the on-demand MPI clusters the platform orchestrates. The testing is not a comprehensive test of Open MPI, because Domino does not modify that software.
The current validated and supported version of Open MPI is 4.1.2. Other Open MPI versions might function properly, but are not supported. Domino does not validate other distributions of MPI.