I think that a compile-time switch that sets the maximum number of threads would be a good solution. This way, you could compile Perl with support for 8 threads on an 8 core processor, and have it be used completely.
Each thread could get one item to start with, and as it finishes, it could get an additional item. If it's just running a built-in function on the list, then each thread could be given 1/n of the list (where n is the number of threads). Otherwise, Perl could time the items and detect about how many would be good to send based on the time.
Perl would still need to get data back from the threads to give back to the core, so sending data shouldn't be a problem either. But I've never used threads, so I may be off.
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