Perl does nothing with parallel processors by itself (AFAIK). If your algorithm lets you, probably the easiest way to get some extra efficiency on multi-processor systems is to fork() off a bunch of processes that work together. Parallel::ForkManager might be useful.

Another option is to use threads but working with threads in perl isn't as straight-forward as you might imagine. Especially don't expect to be able to share objects from classes that weren't written to be thread-aware (which probably includes most modules on CPAN).

For numeric processing PDL supports something called PDL threads, but exactly how that relates to multi-processors is foggy to me.

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