Log file with errors due to MPI [docker install] can cause freezes of FreeCAD

[oliveroxtoby]

In GitLab by @dschmidt-hgu on Dec 7, 2022, 08:00

Problem Description:
Running a simpleFoam case that takes approx. >1500 iterations can cause FreeCAD to freeze,
as the log.simpleFoam file is bloated (>100MB file size) due to MPI error messages.
SimpleFoam will continue to run in the background...

This is an issue related to open-mpi in docker, which is already discussed @
open-mpi/ompi#4948

A simple workaround (presented there and locally tested for CfdOF) is,
to place a new line into the Allrun script [runParallel() function]

runParallel()
{
    nproc="$1"
    shift
    exe="$(which $1)"
    sol=$(basename -- "$1")
    sol="${sol%.*}"
    shift
    if [ -f log."$sol" ]; then rm log."$sol"; fi
    export OMPI_MCA_btl_vader_single_copy_mechanism=none  # bug fix open-mpi
    mpiexec -np $nproc "$exe" -parallel "$@" 1> >(tee -a log."$sol") 2> >(tee -a log."$sol" >&2)
    err=$?
    if [ ! $err -eq 0 ]; then exit $err; fi
}

I cannot say if using another open-mpi version in the docker could make this additional line obsolete.

System Configuration:
FreeCAD_0.20-1-2022-08-20-conda-Linux-x86_64-py310.AppImage
CfdOF v.1.20.4 [Docker install]
Ubuntu 20.04 [Kernel 5.4.0-135-generic]

Kind regards
Dominik

[oliveroxtoby]

In GitLab by @oliveroxtoby on Dec 13, 2022, 10:09

Thank you for this! I've implemented your suggested workaround.