Messages in this thread |  | | | Subject | Re: [Bugme-new] [Bug 12562] New: High overhead while switching or synchronizing threads on different cores | | From | Peter Zijlstra <> | | Date | Mon, 02 Feb 2009 09:19:23 +0100 |
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On Mon, 2009-02-02 at 08:43 +0100, Thomas Pilarski wrote: > Am Freitag, den 30.01.2009, 08:57 +0100 schrieb Mike Galbraith: > > One of those "don't _ever_ do that" things? > > I did not known random() uses a system call. It's rather unrealistic to > have five million system calls in a second. By adding a small loop with > some calculations near the random, the problem disappears too. > It is a unlucky chosen data generator.
I suppose you'll have to go bug the glibc people about their random() implementation.
If you really need random() to perform for your application (monte-carlo stuff?) You might be better off writing a PRNG with TLS state or something.
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