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:
|Fabric||Network hardware and software used|
|shm||Shared memory (for intra-node communication only).|
|ofi||OpenFabrics Interfaces* (OFI)-capable network fabrics, such as 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 topic Communication Fabrics Control in the Intel® MPI Library Developer Reference.