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    INTEL-MPI version 19 slower than INTEL-MPI version 18

    INTEL-MPI version 19 slower than INTEL-MPI version 18

    Sept. 21, 2020

    Problem

    An executable build with:

    module load intel/19.0.3 impi/2019.3

    is up to 20% slower than an executable build with identical code and optimisation, compared with

    module load intel/18.0.5 impi/2018.4

    Mostly affects code pieces are dominated by communication, but also serial code is affected.

    Solution

    Stay, if possoble, with the mpi version 18.

    Related articles

    • Seite:
      Workflow CPU CLX
    • Seite:
      Hybrid Jobs
    • Seite:
      INTEL-MPI version 19 slower than INTEL-MPI version 18
    • Seite:
      Multiple programs multiple data
    • Seite:
      MPI Jobs with more than 40 (96) tasks per node failing



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    {"serverDuration": 8, "requestCorrelationId": "35ace0beeaf94f1b8f5cc2fcd69939a7"}