Developer Reference

  • 2020 Update 2
  • 07/15/2020
  • Public Content

Communication Fabrics Control

I_MPI_FABRICS
Select the particular fabrics to be used.

Syntax

I_MPI_FABRICS=ofi | shm:ofi | shm

Arguments

<fabric>
Define a network fabric.
shm
Shared memory transport (used for intra-node communication only).
ofi
OpenFabrics Interfaces* (OFI)-capable network fabrics, such as Intel® True Scale Fabric, Intel® Omni-Path Architecture, InfiniBand*, and Ethernet (through OFI API).

Description

Set this environment variable to select a specific fabric combination.
The default values are
shm:ofi
for the regular mode and
ofi
for the multiple endpoints mode. In the multiple endpoints mode, the default value
ofi
cannot be changed.
DAPL, TMI, and OFA fabrics are deprecated.
This option is not applicable to
slurm
and
pdsh
bootstrap servers.

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Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804