This is what I actually tried to do at the very beginning. However, if you keep an eye on your "top", you will see that at most 2-3 threads are running concurrently at any time, while most of them are inactive. Indeed, the total execution time is longer with "sleep 0.001" (or echo A), than it is with "sleep 1".

In reply to Re^2: Perl threads loss of performance with system call by daniel85
in thread Perl threads loss of performance with system call by daniel85

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