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Date: Mon, 30 May 2005 20:12:46 -0400
From: Christopher Faylor <cgf-no-personal-reply-please AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Serious performance problems (new snapshot has some performance  improvement)
Message-ID: <20050531001246.GA17217@trixie.casa.cgf.cx>
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On Mon, May 30, 2005 at 08:00:35PM -0400, Tacvek wrote:
>>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. 

There is no reason to expect any improvement in mingw programs from my
change.

cgf

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