The Intel® MPI Library switched from the Open Fabrics Alliance* (OFA) framework to the Open Fabrics Interfaces* (OFI) framework and currently supports libfabric*.
By default, the script that sets the environmental variables (vars.[c]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 -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 -ofi_internal=0
# Set the environment to libfabric from the Intel MPI Library.
$ source <install-dir>/env/vars.sh -ofi_internal=1
# A short form of -ofi-internal=1
$ source <install-dir>/env/vars.sh
Example
$ export I_MPI_DEBUG=1
$ mpiexec -n 1 IMB-MPI1 -help
[0] MPI startup(): libfabric version: 1.5.0
[0] MPI startup(): libfabric provider: psm2
...