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Date: Thu, 25 Aug 2005 14:09:22 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Problems with Windows threads and cygwin sleep()
Message-ID: <20050825120922.GQ17452@calimero.vinschen.de>
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On Aug 25 14:59, Pavel Tsekov wrote:
> 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.

You're on W2K, I'm on XP, maybe there's a difference?  I can easily
reproduce nearly 0% CPU with 1000 threads if no Cygwin process is
present and nearly 99% if a Cygwin process is present.

Even if we can't do much about it, it would be interesting to find out
how Cygwin affects CPU usage of non-Cygwin processes.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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