in reply to Parallel::ForkManager and CPU usage?

You can use the run_on_start and run_on_finish callbacks to print some debug info about when the subprocesses start and stop. That will give you some info to understand better how the children are managed;<

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

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