Have you read the documentation of Parallel::ForkManager? Can you share the code that didn't work?

Update: Copied from the documentation, fruits, sleep, and srand added by me:

#!/usr/bin/perl
use warnings;
use strict;

use Parallel::ForkManager;

my $pm = Parallel::ForkManager->new(5);

for my $fruit (qw( apple banana cherry lemon lime orange peach pear
                   plum raspberry strawberry
              )) {
    my $pid = $pm->start and next;

    print "Sleeping with $fruit\n";
    srand;  # To prevent all the children from having the same seed.
    sleep 3 + rand 8;
    print "$fruit done.\n";
    $pm->finish
}
$pm->wait_all_children;
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($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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