Intel® MPI Library

Developer Reference for Linux* OS

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ID 768732
Date 10/31/2024
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Document Table of Contents
Document Table of Contents x
Developer Reference for Linux* OS
Developer Reference for Linux* OS x
Introduction Command Reference Environment Variable Reference Miscellaneous Notices and Disclaimers
Introduction x
Introducing Intel® MPI Library Notational Conventions Related Information
Command Reference x
Compiler Commands mpirun mpiexec.hydra cpuinfo impi_info mpitune_fast
Compiler Commands x
Compilation Command Options
mpiexec.hydra x
Global Hydra Options Local Hydra Options gtool Options
Environment Variable Reference x
Compilation Environment Variables Hydra Environment Variables I_MPI_ADJUST Family Environment Variables Tuning Environment Variables Process Pinning GPU Support NIC Pinning Environment Variables for Fabrics Control Environment Variables for Memory Policy Control Environment Variables for Asynchronous Progress Control Environment Variables for Multi-EP Other Environment Variables
Tuning Environment Variables x
Autotuning
Autotuning x
I_MPI_TUNING_AUTO Family Environment Variables
Process Pinning x
Environment Variables for Process Pinning Interoperability with OpenMP* API
GPU Support x
GPU Pinning GPU Buffers Support
Environment Variables for Fabrics Control x
Communication Fabrics Control I_MPI_FABRICS Shared Memory Control OFI*-capable Network Fabrics Control
Miscellaneous x
Java* Bindings for MPI-2 Routines
Developer Reference for Linux* OS

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® 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.

NOTE:

This option is not applicable to slurm and pdsh bootstrap servers.

NOTE:

DAPL, TMI, and OFA fabrics are deprecated.

Parent topic: Environment Variables for Fabrics Control
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