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MPI 4: Improve implementation of MPI_COMM_TYPE_HW_UNGUIDED #10635

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jjhursey opened this issue Aug 8, 2022 · 0 comments · Fixed by #10739
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MPI 4: Improve implementation of MPI_COMM_TYPE_HW_UNGUIDED #10635

jjhursey opened this issue Aug 8, 2022 · 0 comments · Fixed by #10739
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jjhursey commented Aug 8, 2022

PR #10630 added support for MPI_COMM_TYPE_HW_UNGUIDED and MPI_COMM_TYPE_HW_GUIDED. It provides good support for "guided" mode but minimal support for "unguided" mode. It closed issue #9197

There are a few ideas for how to implement the "unguided" mode that needs some experimentation.

  • See this comment for an implementation tip.
  • MPICH implemented this using a fixed top-down strategy in this PR see the MPIR_Comm_split_type_hw_unguided function.
  • In the paper "Towards leveraging collective performance with the support of MPI 4.0 features in MPC" cite the used a bottom-up strategy (see Section 7.2)
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Implement MPI_COMM_TYPE_HW_UNGUIDED for MPI_Comm_split_type for MPI 4
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