Intel® MPI Library Developer Guide for Windows* OS

Developer Guide

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
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
[0] MPI startup(): libfabric provider: sockets

...

Supported Providers

  • libfabric.dll

See Also

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.