# Mac OS X ( Perl v5.18.2 )

$ perl foo1.pl | wc -l      # Foo::Inbox
duration:  0.690 seconds
   50000

$ perl inbox.pl | wc -l     # MCE::Inbox w/ blocking capability
duration:  0.721 seconds
   50000

$ perl foo2.pl | wc -l      # MCE::Shared->queue
duration:  0.789 seconds
   50000

$ perl foo4.pl | wc -l      # Thread::Queue
duration:  5.735 seconds
   50000


# CentOS 7 VM ( Perl v5.16.3 )

$ perl foo1.pl | wc -l      # Foo::Inbox
duration:  0.834 seconds
   50000

$ perl inbox.pl | wc -l     # MCE::Inbox w/ blocking capability
duration:  0.726 seconds
   50000

$ perl foo2.pl | wc -l      # MCE::Shared->queue
duration:  0.945 seconds
   50000

$ perl foo4.pl | wc -l      # Thread::Queue
duration:  3.020 seconds
   50000