Read http://search.cpan.org/~yanick/Parallel-ForkManager-1.17/lib/Parallel/ForkManager.pm#BLOCKING_CALLS and then try this to see if it helps: 

#!/usr/local/bin/perl
use strict;
use warnings;
use Parallel::ForkManager;

my $pm = new Parallel::ForkManager(24);
$pm->set_waitpid_blocking_sleep(0);
...

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In reply to Re^3: Help me beat NodeJS (sleep) by Mr. Muskrat
in thread Help me beat NodeJS by rickyw59

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