Currently simfactory's setup-silent sets the default number of threads to the number of (logical) CPUs found. While this is somewhat sensible it means that if one runs a simulation using RotatingSymmetry180 then one has to manually set --num-threads to a non-default value, otherwise the code aborts.

On a workstation or laptop the a simulation usually runs fastest if using only MPI and not OpenMP, ie. num-threads=1 (see the discussion in #2059).

I would like to advocate to change this default to be num-threads=2 for a machine with an even number of cores and num-threads=number-of-logical-cpus (ie the current value) for odd numbers of cores (which really should be only those rare single core machines anymore).

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2265/simfactorys-setup-silent-should-set-the