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Date: Thu, 25 Aug 2005 15:40:11 +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:

> > 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.

Stopping all Cygwin dependent programs helps here too - the program runs
fine. I forgot sshd, cygserver and inetd. I did some further testing -
here are the results:

1) Bash in Cygwin console

   CPU usage is ok

2) Bash in rxvt (W11)

  CPU usage 99 %

3) inetd started as service with no clients connected

  CPU usage is ok

  When a client is connected CPU goes 99%

4) sshd started as service (doesn't matter if there are connected clients)

  CPU usage 99 %

The tests were performed with no other Cygwin programs running and
threads.exe running in command prompt. Each time I would stop all involved
programs and start them again.

Perhaps ptys are involved ?!

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