Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
Message-ID: <BAY102-DAV12D4850AC850F49280B6A7A9040@phx.gbl>
X-Originating-Email: [unknown_kev_cat AT hotmail DOT com]
X-Sender: unknown_kev_cat AT hotmail DOT com
From: "Tacvek" <unknown_kev_cat AT hotmail DOT com>
To: "Gerrit P. Haase" <gerrit AT familiehaase DOT de>
Cc: <cygwin AT cygwin DOT com>
References: <000b01c563c7$f4456f00$976d65da AT DANNY> <4298F195 DOT 9090600 AT familiehaase DOT de> <20050529000152 DOT GE3094 AT trixie DOT casa DOT cgf DOT cx> <20050529001846 DOT GG3094 AT trixie DOT casa DOT cgf DOT cx> <20050529030523 DOT GA10263 AT trixie DOT casa DOT cgf DOT cx> <20050529171324 DOT GA26603 AT trixie DOT casa DOT cgf DOT cx> <429A19EC DOT 9080905 AT familiehaase DOT de> <20050529201431 DOT GB28340 AT trixie DOT casa DOT cgf DOT cx> <d7fo8b$uda$1 AT sea DOT gmane DOT org> <429B78A5 DOT 2050107 AT familiehaase DOT de>
Subject: Re: Serious performance problems (new snapshot has some performance  improvement)
Date: Mon, 30 May 2005 20:00:35 -0400
MIME-Version: 1.0
Content-Type: text/plain; 	format=flowed; 	charset="iso-8859-1"; 	reply-type=response
Content-Transfer-Encoding: 7bit


> Interesting, why is it faster when running a binary that doesn't
> depend on cygwin1.dll after swapping the DLL?  Some Win caching mechanism?
>
Repeating many times should minimize any caching:

#New DLL
$ /bin/time -f "%E %S %U" cygspd-mingw-ne-o7 cygspd.dat
0:04.48 0.01 0.02
0:01.40 0.00 0.02
0:01.46 0.01 0.01
0:01.39 0.01 0.01
0:01.43 0.01 0.01
#old DLL
$ /bin/time -f "%E %S %U" cygspd-mingw-ne-o7 cygspd.dat
0:01.45 0.01 0.01
0:01.41 0.00 0.01
0:01.40 0.01 0.01
0:01.41 0.00 0.02
0:01.41 0.00 0.02
0:01.43 0.01 0.01


Ok there is obviously some caching, which means that the original values I 
gave inidacte that the improvement is somewhat less than they indicate. They 
did not indicate very spectacular performance anyway. But fractional seconds 
do not mean much.
Based on some additioal experimentation, you should assume that the values 
are acurate to +/- 1 second. 

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/