Intel® MPI Library Developer Guide for Windows* OS

ID 768730
Date 3/22/2024
Public

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Document Table of Contents

Libfabric* Support

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
NOTE:
Set the I_MPI_DEBUG environment variable to 1 before running an MPI application to see the libfabric version and provider.

Example

> set I_MPI_DEBUG=1
> mpiexec -n 2 IMB-MPI1 pingpong
[0] MPI startup(): libfabric version: 1.5.3-impi

...

Supported Providers

  • tcp
  • netdir

See Also