- Check accessibility of the hosts. Run a simple non-MPI application (for example, thehostnameutility) on the problem hosts using. For example:mpirun$ mpirun -ppn 1 -n 2 -hosts node01,node02 hostname node01 node02This 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).
- Run the MPI application with debug information enabled: set the environment variablesI_MPI_DEBUG=6and/orI_MPI_HYDRA_DEBUG=on. Increase the integer value of debug level to get more information. This action helps narrow down to the problematic component.
- 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.