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Code Block
-genv I_MPI_DAPL_PROVIDER=ofa-v2-mlx5_0-1u

 or 

-genv I_MPI_DAPL_PROVIDER=ofa-v2-mlx5_2-2u


More info: https://software.intel.com/en-us/articles/tuning-the-intel-mpi-library-basic-techniques