in reply to Parallel::ForkManager and wait_all_children

Now the noise of irrelevant side-issues has abated, have you tried setting $pm->set_waitpid_blocking_sleep(0); and see how that changes your results?

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority". I'm with torvalds on this
In the absence of evidence, opinion is indistinguishable from prejudice. Agile (and TDD) debunked

In Section Seekers of Perl Wisdom