For completeness, here's the code using Parallel::ForkManager. Calling MCE::Shared->init() is important to spread out IPC across 12 data channels. Not doing so, means all 200 workers share a single data channel and take much longer to run. Init is called automatically for MCE, MCE::Hobo and threads.

Parallel::ForkManager

use strict;
use warnings;

use Parallel::ForkManager;
use MCE::Shared;
use Time::HiRes 'time';

my $n = MCE::Shared->scalar(0);
my $s = time;

my $fork_manager = new Parallel::ForkManager(200);

$fork_manager->set_waitpid_blocking_sleep(0);

foreach my $child ( 1 .. 200 ) {
   my $pid = $fork_manager->start($child) and next;

   # init optionally takes an integer value
   MCE::Shared->init($child);

   my $v; $v = $n->incr() for 1 .. 933;

   $fork_manager->finish($child);
}

$fork_manager->wait_all_children;

printf "duration: %0.3f\n", time - $s;
print $n->get(), "\n";

__END__

main process, shared-manager process, and 200 workers

Parallel::ForkManager: ~ 1200K per worker
[download]

It's great knowing that MCE::Hobo isn't far behind regarding memory consumption. What I've learn is that simply loading modules doesn't tell the whole story. One must capture memory consumption while running for a better picture. :)

Regards, Mario