MPI Test fails with OpenMPI 4.1.3 from homebrew

[tkoskela]

On my (Intel) MacOS 12.3.1, running Julia 1.7.2 and MPI.jl 0.19.2, the MPI test of ParticleDA.jl fails when tests are run from the package manger with (@v1.7) pkg> test ParticleDA. Calling the same test from the command line using

mpiexec -n 3 /Applications/Julia-1.7.app/Contents/Resources/julia/bin/julia --project=./test --startup-file=no -q -t1 /Users/tkoskela/.julia/dev/ParticleDA/test/mpi.jl

runs successfully. There is no error message, after some debugging with @giordano it seems the mpiexec command just silently fails. My MPI.jl was built against the system MPI, which was OpenMPI 4.1.3 installed from homebrew. You can see which implementation MPI.jl is using by calling MPI.identify_implementation().

As a workaround, rebuilding MPI.jl against its self-provided MPICH 4.1.2, using

julia -e 'ENV["JULIA_MPI_BINARY"]="MPICH_jll"; using Pkg; Pkg.build("MPI"; verbose=true)'

Seems to have resolved the error.

Edit: Seeing inconsistent behaviour with the OpenMPI provided by MPI.jl. Have had it both run successfully and fail without any error message. Not clear why.