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Date: Thu, 25 Aug 2005 14:59:28 +0300
From: Pavel Tsekov <ptsekov AT gmx DOT net>
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To: cygwin AT cygwin DOT com
Subject: Re: Problems with Windows threads and cygwin sleep()
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Hello,

On Thu, 25 Aug 2005, Corinna Vinschen wrote:

> On Aug 25 13:40, Raul Metsma wrote:
> > Seems this is something related CPU-s or total Windows thread count
> > I tested it on Windwos 2003, where are 2x2,4GHz Intel Xeon
> > There occurs this issue on 800 threads
>
> You're right, when raising the number of threads, I see this test
> gradually taking more CPU time the more threads it has, nearly 95%
> with 800 threads.
>
> As long as one starts it from a cmd shell and no Cygwin application is
> present, the CPU keeps low under 5%.  As soon as a Cygwin process is
> present...

Here when the app is compiled with -mno-cygwin it takes 100% cpu when it
allocates 400+ threads - both from Windows Command Prompt and Cygwin bash.
After all the testcase consist almost entirely of Win32 calls.



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