Follow-up Comment #4, bug #38092 (project findutils):
After googling --process-slot-var I don't see how it could be useful, although
I haven't found its exact description. Mainly because I don't think it is
possible to distunguish between different invocations of xargs started with
mpirun (or equivalent) in a standard way since all of the invocations are
identical as far as non-MPI programs can tell.
Anyway if the solution outlined previously works the required patch would be
quite small and not noticeable if the program is compiled with regular gcc.
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