Intel® MPI Library

Selecting Fabrics

Intel® MPI Library enables you to select a communication fabric at runtime without having to recompile your application. By default, it automatically selects the most appropriate fabric based on your software and hardware configuration. This means that in most cases you do not have to bother about manually selecting a fabric.

Prerequisite Steps

Before you start using any of the Intel® MPI Library functionality, make sure to establish the proper environment for Intel MPI Library. Follow these steps:

  1. Set up the Intel MPI Library environment. Run the mpivars.bat script:

    > <installdir>\intel64\bin\mpivars.bat

    By default, <installdir> is C:\Program Files (x86)\IntelSWTools\mpi\<version>.

Getting Debug Information

The I_MPI_DEBUG environment variable provides a convenient way to get detailed information about an MPI application at runtime. You can set the variable value from 0 (the default value) to 1000. The higher the value, the more debug information you get. For example:

Statistics Gathering Mode

Intel® MPI Library provides the built-in statistics gathering facility that provides essential information about MPI program execution. You can use the native or IPM statistics formats or both at once. See description of the environment variables controlling statistics collection below:

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