Developer Guide

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

Troubleshooting

This section provides the troubleshooting information on typical MPI failures with corresponding output messages and behavior when a failure occurs.
If you encounter errors or failures when using the Intel® MPI Library, take the following general troubleshooting steps first:
  1. Check the
    System Requirements
    section and the
    Known Issues
    section in the
    Intel® MPI Library Release Notes
    .
  2. Check accessibility of the hosts. Run a simple non-MPI application (for example, the
    hostname
    utility) on the problem hosts using
    mpirun
    . For example:
    $ mpirun -ppn 1 -n 2 -hosts node01,node02 hostname node01 node02
    This may help reveal an environmental problem (such as, the MPI remote access mechanism is not configured properly), or a connectivity problem (such as, unreachable hosts).
  3. Run the MPI application with debug information enabled: set the environment variables
    I_MPI_DEBUG=6
    and/or
    I_MPI_HYDRA_DEBUG=on
    . Increase the integer value of debug level to get more information. This action helps narrow down to the problematic component.
  4. If you have the availability, download and install the latest version of Intel MPI Library from the official product page and check if your problem persists.
  5. If the problem still persists, you can submit a ticket via Intel® Premier Support or ask experts on the community forum.
 

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.