Intel® MPI Library Developer Guide for Windows* OS

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ID 768730
Date 10/31/2024
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Document Table of Contents
Document Table of Contents x
Intel® MPI Library Developer Guide for Windows* OS
Intel® MPI Library Developer Guide for Windows* OS x
Introduction Installation and Prerequisites Compiling and Linking Running Applications Debugging Applications Analysis and Tuning Troubleshooting Notices and Disclaimers
Introduction x
Introducing Intel® MPI Library Conventions and Symbols Related Information
Installation and Prerequisites x
Installation Prerequisite Steps User Authorization
Compiling and Linking x
Compiling an MPI Program Configuring a Microsoft Visual Studio* Project
Running Applications x
Running Intel® MPI Library in Containers Selecting a Library Configuration Running an MPI Program Running an MPI/OpenMP* Program MPMD Launch Mode Fabrics Control Job Schedulers Support Controlling Process Placement Java* MPI Applications Support
Running Intel® MPI Library in Containers x
Build a Singularity* Container for an MPI Application Run the Application with a Container
Fabrics Control x
Selecting Fabrics Libfabric* Support OFI* Providers Support
Debugging Applications x
Debugging Using -gtool for Debugging
Analysis and Tuning x
Displaying MPI Debug Information Tracing Applications MPI Tuning
Troubleshooting x
Error Message: Bad Termination Error Message: No such file or Directory Error Message: Permission Denied Error Message: Fatal Error Error Message: Bad File Descriptor Error Message: Too Many Open Files Problem: MPI Application Hangs Problem: Password Required Problem: Cannot Execute Binary File Problem: MPI limitation for Docker*
Intel® MPI Library Developer Guide for Windows* OS

MPMD Launch Mode

Intel® MPI Library supports the multiple programs, multiple data (MPMD) launch mode. There are two ways to do this.

The easiest way is to create a configuration file and pass it to the -configfile option. A configuration file should contain a set of arguments for mpiexec, one group per line. For example: 

> type mpmd_config
-n 1 -host node1 io.exe <io_args>
-n 4 -host node2 compute.exe <compute_args_1> 
-n 4 -host node3 compute.exe <compute_args_2
> mpiexec -configfile mpmd_config

Alternatively, you can pass a set of options to the command line by separating each group with a colon: 

> mpiexec -n 1 -host node1 io.exe <io_args> :
^-n 4 -host node2 compute.exe <compute_args_1> :
^-n 4 -host node3 compute.exe <compute_args_2>

The examples above are equivalent. The io program is launched as one process on node1, and the compute program is launched on node2 and node3 as four processes on each.

When an MPI job is launched, the working directory is set to the working directory of the machine where the job is launched. To change this, use the -wdir <path>.

Use -env <var> <value> to set an environment variable for only one argument set. Using -genv instead applies the environment variable to all argument sets. By default, all environment variables are propagated from the environment during the launch.

Parent topic: Running Applications
Level Two Title