Yes, that only works with command line programs.
But it is pretty easy to convert function calls to command line programs.
In any case, I wouldn't use Parallel::Simple because I have always valued the ability to control how many children I have at once. (Generally there is a fairly fixed amount of potential parallelism. Using that many kids get gets maximum throughput. If you go higher or lower your overall throughput goes down.) Therefore if you really don't want to convert function calls then I'd use something like Parallel::ForkManager and build my own solution.
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