The Intel® MPI Library switched from the Open Fabrics Alliance* (OFA) framework to the Open Fabrics Interfaces* (OFI) framework and currently supports libfabric*.
Enabling Libfabric Support
By default, the script that sets the environmental variables (vars.bat) sets the environment to libfabric shipped with the Intel MPI Library. To disable this, use the I_MPI_OFI_LIBRARY_INTERNAL environment variable or the -i_mpi_ofi_internal option passed to the script:
# Do not set the environment to libfabric from the Intel MPI Library. > call <install-dir>\env\vars.bat -i_mpi_ofi_internal=0 # Set the environment to libfabric from the Intel MPI Library. > call <install-dir>\env\vars.bat -i_mpi_ofi_internal=1
> set I_MPI_DEBUG=1 > mpiexec -n 2 IMB-MPI1 pingpong  MPI startup(): libfabric version: 1.5.3-impi  MPI startup(): libfabric provider: sockets ...