Have a look at Parallel::Iterator - Simple parallel execution, too.

The workers option sets the number of concurrent processes to launch. 

my $max_forks = 42; 

my $options = { workers => $max_forks,  };

iterate(  $options , $worker, $iterator );

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In reply to Re^4: fixed set of forked processes by tomfahle
in thread fixed set of forked processes by anonymized user 468275

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