Intel® MPI Library Developer Reference for Windows* OS

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ID 768734
Date 10/31/2024
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Document Table of Contents
Document Table of Contents x
Intel® MPI Library Developer Reference for Windows* OS
Intel® MPI Library Developer Reference for Windows* OS x
Introduction Command Reference Environment Variable Reference Notices and Disclaimers
Introduction x
Introducing Intel® MPI Library Notational Conventions Related Information User Authorization
Command Reference x
Compiler Commands mpiexec.hydra cpuinfo impi_info
Compiler Commands x
Compilation Command Options
mpiexec.hydra x
Global Hydra Options Local Hydra Options
Environment Variable Reference x
Compilation Environment Variables Hydra Environment Variables I_MPI_ADJUST Family Environment Variables Tuning Environment Variables Main Thread Pinning Environment Variables for Fabrics Control Environment Variables for Memory Policy Control Other Environment Variables
Tuning Environment Variables x
Autotuning
Autotuning x
I_MPI_TUNING_AUTO Family Environment Variables
Main Thread Pinning x
Environment Variables for Main Thread Pinning Interoperability with OpenMP* API
Environment Variables for Fabrics Control x
Communication Fabrics Control Shared Memory Control OFI*-capable Network Fabrics Control
Intel® MPI Library Developer Reference for Windows* 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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