Mailing-List:	contact cygwin-developers-help AT sourceware DOT cygnus DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-developers-subscribe AT sources DOT redhat DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin-developers/>
List-Post:	<mailto:cygwin-developers AT sources DOT redhat DOT com>
List-Help:	<mailto:cygwin-developers-help AT sources DOT redhat DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender:	cygwin-developers-owner AT sources DOT redhat DOT com
Delivered-To:	mailing list cygwin-developers AT sources DOT redhat DOT com
Date:	Sat, 8 Sep 2001 20:16:40 -0400
From:	Christopher Faylor <cgf AT redhat DOT com>
To:	cygwin-developers AT cygwin DOT com
Subject:	Re: cygwin slowdown in current cvs version
Message-ID:	<20010908201640.B22847@redhat.com>
Reply-To:	cygwin-developers AT cygwin DOT com
Mail-Followup-To:	cygwin-developers AT cygwin DOT com
References:	<130160175780 DOT 20010908204017 AT logos-m DOT ru> <127165775081 DOT 20010908221336 AT logos-m DOT ru> <186168543292 DOT 20010908225944 AT logos-m DOT ru> <20010908155203 DOT C12571 AT redhat DOT com> <20010908222326 DOT B937 AT cygbert DOT vinschen DOT de> <20010908164412 DOT B13528 AT redhat DOT com> <999994387 DOT 9504 DOT 118 DOT camel AT lifelesswks>
Mime-Version:	1.0
In-Reply-To:	<999994387.9504.118.camel@lifelesswks>
User-Agent:	Mutt/1.3.21i

On Sun, Sep 09, 2001 at 10:13:06AM +1000, Robert Collins wrote:
>On Sun, 2001-09-09 at 06:44, Christopher Faylor wrote:
>> On Sat, Sep 08, 2001 at 10:23:26PM +0200, Corinna Vinschen wrote
>> 
>> If we were going to do that, though, we should set up one global "change
>> notification" handle for /etc/group and /etc/passwd, right?
>
>After a quick MSDN scan, I couldn't see any per file scanning mechanism.
>which means notification on /etc is about it (barring fancy tricks like
>/etc/changingdata/passwd and /etc/passwd->changindata/passwd :])

A google search reveals some undocumented calls that allow you to track
all sorts of things.

After a little more testing, it seems like the slowdown is actually due
to the FindFirstChangeNotification call.  If I add that and avoid the
WaitForSingleObject, I still get a noticeable slowdown.

cgf

- Raw text -