Selecting Fabrics

Intel® MPI Library enables you to select a communication fabric at runtime without having to recompile your application. By default, it automatically selects the most appropriate fabric based on your software and hardware configuration. This means that in most cases you do not have to bother about manually selecting a fabric.

However, in certain situations specifying a particular communication fabric can boost performance of your application. The following fabrics are available:


Network hardware and software used


Shared memory (for intra-node communication only).


OpenFabrics Interfaces* (OFI)-capable network fabrics, such as Intel® True Scale Fabric, Intel® Omni-Path Architecture, InfiniBand* and Ethernet (through OFI API).

Use the I_MPI_FABRICS environment variable to specify a fabric. The description is available in the Developer Reference, section Tuning Reference > Fabrics Control.

For more complete information about compiler optimizations, see our Optimization Notice.