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.sh) 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. $ source <install-dir>/env/vars.sh -i_mpi_ofi_internal=0 # Set the environment to libfabric from the Intel MPI Library. $ source <install-dir>/env/vars.sh -i_mpi_ofi_internal=1 # A short form of -ofi-internal=1 $ source <install-dir>/env/vars.sh
$ export I_MPI_DEBUG=1 $ mpiexec -n 1 IMB-MPI1 -help  MPI startup(): libfabric version: 1.5.0  MPI startup(): libfabric provider: psm2 ...