I was yesterday on the #perl-help channel on irc.perl.org and 2-3 people tried and observed the same behaviour. When you run the first one (sleep 1), all the threads are spawned nearly instantaneously, while with the second (sleep 0.0001), you see considerable delay in the spawning.

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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