Would appreciate if you could help me understand whats going on

I've already explained:

The only reason it wouldn't be responsive is if you have slow code that executes in the parent.

In addition to intentionally slowing down the parent (sleep 5;), your parent blocks (my $job = $clnt->reserve();). This prevents it from reaping in a timely manner.

In reply to Re^4: Should I call waitpid when using Parallel::ForkManager to fork in an infinite loop? by ikegami
in thread Should I call waitpid when using Parallel::ForkManager to fork in an infinite loop? by unlinker

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