Intel® MPI Library Developer Guide for Windows* OS

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ID 768730
Date 3/22/2024
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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 See Also 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

Running an MPI Program

Before running an MPI program, place it to a shared location and make sure it is accessible from all cluster nodes. Alternatively, you can have a local copy of your program on all the nodes. In this case, make sure the paths to the program match.

Run the MPI program using the mpiexec command. The command line syntax is as follows: 

> mpiexec -n <number-of-processes> -ppn <processes-per-node> -f <hostfile> myprog.exe

For example: 

> mpiexec -n 4 -ppn 2 -f hosts myprog.exe

The mpiexec command launches the Hydra process manager, which controls the execution of your MPI program on the cluster.

In the command line above:

  • -n sets the number of MPI processes to launch; if the option is not specified, or uses the number of cores on the machine.
  • -ppn sets the number of processes to launch on each node; if the option is not specified, processes are assigned to the physical cores on the first node; if the number of cores is exceeded, the next node is used.
  • -f specifies the path to the host file listing the cluster nodes; alternatively, you can use the -hosts option to specify a comma-separated list of nodes; if hosts are not specified, the local node is used.
  • myprog.exe is the name of your MPI program.

For the list of all available options, run mpiexec with the -help option, or see section mpiexec.hydra in the Intel® MPI Library Developer Reference.

Parent topic: Running Applications
Level Two Title