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Re: Perl threads loss of performance with system call

by dave_the_m (Monsignor)
on Jul 10, 2021 at 08:58 UTC ( #11134895=note: print w/replies, xml ) Need Help??


in reply to Perl threads loss of performance with system call

I can't reproduce the issue here (linux, 12 core x86_64; I tried various perls from 5.10.1 to 5.34.0).

With sleep 1, I get a total running time of the program of 1m 40s (consistent with each thread in parallel doing 100 1s sleeps), and with sleep 0.0001, I get a total running time of 2.5s, which seems reasonable for all the overhead of setting up and tearing down 50 threads plus the overhead of doing 50000 calls to system().

Dave.

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Re^2: Perl threads loss of performance with system call
by daniel85 (Novice) on Jul 10, 2021 at 09:19 UTC
    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.

      and what OS did they run the code in?

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