Developer Guide

Prerequisite Steps

Before you start using any of the Intel® MPI Library functionality, make sure to establish the proper environment settings:
  1. Set up the Intel MPI Library environment by
    running the
    , which is found in your installation directory (by default,
    C:\Program Files (x86)\Intel\oneAPI\mpi\<
    You must run
    at the start of each
    unless you are using Microsoft Visual Studio for Windows* (Visual Studio runs
    . See the Intel oneAPI HPC Toolkit Get Started Guide for more details, including options for automatic setup of environment settings.
  2. To run an MPI application on a cluster, the Intel MPI Library needs to know names of all its nodes. Create a text file listing the cluster node names. The format of the file is one name per line, and the lines starting with
    are ignored. To get the name of a node, use the
    A sample host file may look as follows:
    > type hosts # This line is ignored clusternode1 clusternode2 clusternode3 clusternode4
  3. Make sure the Hydra service is installed and running on the cluster nodes. To check this, enter the command:
    > hydra_service -status
    If the service is not running, use the following command to install and run it:
    > hydra_service -install
    You must run this command as an administrator.
  4. Register your Windows user credentials to enable the process manager to launch MPI jobs. Credentials are encrypted and stored in the registry:
    > mpiexec -register
    If you do not do this in advance, you will be prompted to enter credentials when running an MPI job with
    You can also use the domain-based authorization, which does not ask for your credentials, but requires some additional configuration. See User Authorization for details.
After completing these steps, you are ready to use the Intel MPI Library.

Product and Performance Information


Performance varies by use, configuration and other factors. Learn more at