There's no need to be quite that verbose as Parallel::ForkManager handles the number of processes for you. So you can write that as :-

...
my $pm = Parallel::ForkManager->new($num_of_cores);
for my mp3 (@mp3s) {
   $pm->start and next;
   do_work($mp3);
   $pm->finish;
}
$pm->wait_all_children;

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In reply to Re^3: No Performance gain with Parallel::ForkManager by RichardK
in thread No Performance gain with Parallel::ForkManager by walto

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