MCE::Hobo uses MCE::Shared for IPC. You may prefer MCE::Child to not involve a shared-manager process. MCE::Child uses MCE::Channel for IPC. MCE::Channel came long after making MCE::Hobo and thought to make something similar that works with Perl v5.8.1 and above.

use v5.10.1;
use MCE::Child;
 
MCE::Child->init(
    max_workers => 50,
    posix_exit  => 1,
    on_finish   => sub {
        my ($pid, $exit_code, $ident, $exit_signal, $error, $resp) = @
+_;
        print "child $pid completed: $ident => ", $resp->[0], "\n";
    }
);
 
foreach my $data ( 1..2000 ) {
    MCE::Child->create( $data, sub {
        MCE::Child->yield(0.008);
        # sleep 1;  # simulate connection instantiation
        [ $data * 2 ];
    });
}
 
MCE::Child->wait_all;
[download]

Writing MCE::Child was helpful in improving MCE::Hobo and vice versa. Yeah, there are two similar modules. MCE::Child is mostly compatible with MCE::Hobo. MCE::Hobo is more compatible with threads, but requires Perl v5.10.1 minimally.