Calling mpi_split_by_app with a single app about mui HOT 3 CLOSED

I think the second approach of aborting with a helpful error is probably the safest option. The situation doesn't make much sense and it is better a non-MPI savvy user is informed of this than it appearing to work but the logic being wrong. There are a few places in the code where this sort of thing crops up for specific use-cases...

As MUI progresses, decisions like this will need to be unified into en ethos, documentation made, CI added to the repository etc. etc.

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Cheers Stephen. I'll do that and send a PR. I had a very confused 30mins... Debugging MPMD runs is often non-trivial...

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Agreed! If you aren't already, you can make it a fraction easier by tunnelling each rank's console output to individual files using the --output-filename flag with mpirun (i.e. mpirun --output -filename Logs/outputfiles -np 2 solver1 : -np 4 solver 2)

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