Getting started with MCE (the Many-Core Engine)

[Anonymous Monk]

I'm trying to get Perl to use all CPU cores with MCE. I have read and tried some examples but can't seem to grasp it. Can anyone explain MCE for dummies? I was hoping this would produce a large number but it only prints 0:

#!/usr/bin/perl

use strict;
use warnings;
use MCE::Loop;

our $fu = 0;

MCE::Loop::init {
   max_workers => 8,
   chunk_size => 1000
};

mce_loop { do_work($_) } 1..10000000;
print "Done: $fu\n";

sub do_work { $fu += $_[0] }