in reply to Re^2: Parallel::ForkManager How to wait when 1st 10 Child processe are over out of 100
in thread Parallel::ForkManager How to wait when 1st 10 Child processe are over out of 100

Ah, I see. Then something like this may help (not tested): 

$pm->run_on_finish(
    sub {
        state $counter;
        start_next_10_processes() unless ++$counter % 10;
    }
);

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