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  • Software that brings its own copy of Intel MPI may fail on startup with an error similar to:

    Fatal error in MPI_Init: Other MPI error, error stack:
MPIR_Init_thread(805): fail failed
MPID_Init(1743)......: channel initialization failed
MPID_Init(2137)......: PMI_Init returned -1

    • Reason: Within compute jobs, we automatically set the I_MPI_PMI_LIBRARY environment variable to allow running MPI jobs using srun with Intel MPI. However, codes that bring their own copy of Intel MPI usually use a different startup mechanism (e.g., mpirun) which fails when this variable is set.

    • Solution: Unset the variable in your job script using unset I_MPI_PMI_LIBRARY.

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