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zcat &> /dev/null 0.54s user 0.01s system 99% cpu 0.549 total
node test.js 0.79s user 0.05s system 130% cpu 0.646 total
perl test.pl 0.23s user 0.03s system 38% cpu 0.686 total

#!/usr/local/bin/perl
use strict;
...
         $pm->finish;
}
$pm->wait_all_children;