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  1. or download this
    karls-mac-mini:monks karl$ ./forker.pl
numbers: 2000
processes: 4
fork: 31.1171970367432
for: 40.2419550418854
  2. or download this
    while(defined( my $number = $iterator->())) {
    $pm->start($number) and next;
...
}
$pm->wait_all_children;
  3. or download this
    for my $number (@numbers) {
    $pm->start($number) and next;
...
    $pm->finish( 0, \$factorial );
}
$pm->wait_all_children;