Intel® MPI Library Developer Reference for Linux* OS

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ID 768732
Date 3/22/2024
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Document Table of Contents
Document Table of Contents x
Intel® MPI Library Developer Reference for Linux* OS
Intel® MPI Library 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 Shared Memory Control OFI*-capable Network Fabrics Control
Miscellaneous x
Java* Bindings for MPI-2 Routines
Intel® MPI Library Developer Reference for Linux* OS

impi_info

Provides information on available Intel® MPI Library environment variables.

Syntax

impi_info <options>

Arguments

<options> List of options.
-a | -all Show all IMPI variables.
-h | -help Show a help message.
-v | -variable Show all available variables or description of the specified variable.
-c | -category Show all available categories or variables of the specified category.
-e | -expert Show all expert variables.

Description

The impi_info utility provides information on environment variables available in the Intel MPI Library. For each variable, it prints out the name, the default value, and the value data type. By default, a reduced list of variables is displayed. Use the  -all option to display all available variables with their descriptions.

The example of the impi_info output: 

$ ./impi_info
| NAME                                   | DEFAULT VALUE | DATA TYPE   |
========================================================================
| I_MPI_THREAD_SPLIT                     | 0             | MPI_INT     |
| I_MPI_THREAD_RUNTIME                   | none          | MPI_CHAR    |
| I_MPI_THREAD_MAX                       | -1            | MPI_INT     |
| I_MPI_THREAD_ID_KEY                    | thread_id     | MPI_CHAR    |
Parent topic: Command Reference
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