Intel® MPI Library

Developer Reference for Linux* OS

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ID 768732
Date 10/31/2024
Public
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 -n or -np -env -envall -envnone -envexcl -envlist -host -path -wdir 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
Developer Reference for Linux* OS

Local Hydra Options

This section describes the local options of the Intel® MPI Library's Hydra process manager. Local options are applied only to the argument set they are specified in. Argument sets are separated by a colon ':'.

-n <number-of-processes> or -np <number-of-processes>

Use this option to set the number of MPI processes to run with the current argument set.

-env <envar> <value>

Use this option to set the <envar> environment variable to the specified <value> for all MPI processes in the current argument set.

-envall

Use this option to propagate all environment variables in the current argument set. See the I_MPI_HYDRA_ENV environment variable for more details.

-envnone

Use this option to suppress propagation of any environment variables to the MPI processes in the current argument set.

NOTE:
The option does not work for localhost.

-envexcl <list-of-envvar-names>

Use this option to suppress propagation of the listed environment variables to the MPI processes in the current argument set.

-envlist <list>

Use this option to pass a list of environment variables with their current values. <list> is a comma separated list of environment variables to be sent to the MPI processes.

-host <nodename>

Use this option to specify a particular <nodename> on which the MPI processes are to be run. For example, the following command executes a.out on hosts host1 and host2: 

$ mpiexec.hydra -n 2 -host host1 ./a.out : -n 2 -host host2 ./a.out

-path <directory>

Use this option to specify the path to the <executable> file to be run in the current argument set.

-wdir <directory>

Use this option to specify the working directory in which the <executable> file runs in the current argument set.

Parent topic: mpiexec.hydra
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