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Date: Thu, 18 Apr 2002 18:01:55 +0200
From: Corinna Vinschen <cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: cygwin randomly pauses under Win2k
Message-ID: <20020418180155.E24044@cygbert.vinschen.de>
Mail-Followup-To: cygwin AT cygwin DOT com
References: <E16xVQZ-0005tK-00 AT m1 DOT dnsix DOT com> <00df01c1e6ee$2d1c7850$0100a8c0 AT advent02> <20020418155243 DOT GC30868 AT redhat DOT com>
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On Thu, Apr 18, 2002 at 11:52:43AM -0400, Chris Faylor wrote:
> On Thu, Apr 18, 2002 at 04:31:56PM +0100, Chris January wrote:
> >> Every now and again (every 15-30 minutes or so), my cygwin apps
> >> pause for 1-2 MINUTES....   I have written a simple script to capture
> >> this behaviour:
> >
> >Yes, I've seen this behaviour. It's something to do with file I/O IIRC. 100%
> >reproducible in a small program I have. Here's an strace demonstrating the
> >problem:
> 
>  From the code, the only thing here that I can see which could take any time
> is the set_security_attribute() call, which is only invoked if you have
> CYGWIN=ntsec.

And the only thing in set_security_attribute() which could take a lot
of time is the call to LookupAccountName() which is only called if
the /etc/passwd file doesn't contain the SID for the user *and*
which can only take a lot of time if the machine is asking a DC.

OTOH, set_security_attribute() cant have been called, otherwise
it would have left footprints in the strace output.

> >   97 7911229 [main] base 2872 fhandler_base::open:
> >(C:\cygwin\opt\kde2\lib\cygkatecore.dll, 0x110000)
> >*** big long pause ***
> >11237820 19149049 [main] base 2872 fhandler_base::open: 0x19C = CreateFileA
> >(C:\cygwin\opt\kde2\lib\cygkatecore.dll, 0x8
> >0000000, 0x7, 0x22F764, 0x3, 0x2000080, 0)
> 
> cgf

Corinna

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

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