Floating point exception with Intel MPI 2019.x using one task per node

Problem

When using Intel MPI 2019 (impi/2019.x) to start MPI jobs executing one task per node, the jobs aborts immediately with an error message

srun: error: gcnXXXX: task 0: Floating point exception
srun: error: gcnYYYY: task 1: Floating point exception
[...]

Solution

This is due to a problem with Intel's Hydra process manager. A workaround is to assign the environment variable I_MPI_HYDRA_TOPOLIB the value ipl (internal default value hwloc).

#!/bin/bash
#SBATCH [...]

export I_MPI_HYDRA_TOPOLIB=ipl

[...]

Floating point exception with Intel MPI 2019.x using one task per node

Problem

Solution

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