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
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

mpirun

Launches an MPI job and provides integration with job schedulers.

Syntax

mpirun <options>

Arguments

<options> mpiexec.hydra options as described in the mpiexec.hydra section. This is the default operation mode.

Description

Use this command to launch an MPI job. The mpirun command uses Hydra as the underlying process manager.

The mpirun command detects if the MPI job is submitted from within a session allocated using a job scheduler like Torque*, PBS Pro*, LSF*, Parallelnavi* NQS*, Slurm*, Univa* Grid Engine*, or LoadLeveler*. The mpirun command extracts the host list from the respective environment and uses these nodes automatically according to the above scheme.

In this case, you do not need to create a host file. Allocate the session using a job scheduler installed on your system, and use the mpirun command inside this session to run your MPI job.

Example 

$ mpirun -n <# of processes> ./myprog

This command invokes the mpiexec.hydra command (Hydra process manager), which launches the myprog executable.

Parent topic: Command Reference
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