Some processor number combinations don't work on Kraken

Submitting on Kraken with;

sim --remote kraken create-submit maxwell_1proc --testsuite --procs 6 --num-threads 6 --walltime 4:00:00

leads to an error from aprun along the lines of -n cannot exceed -N (sorry, I deleted the error message). The idea was to get one MPI process with 6 threads. This same simfactory submission command works on Datura. The workaround is to use additionally --ppn-used=6. Is there some documentation for what each of these command line options precisely does?

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