Subject: Re: [AL] Compilers comparisson, some opinions about the generated , assembler
Date: Wed, 16 Jun 1999 08:43:57 -0800
Message-Id: <47568953.6.19732@mx1-13.onmedia.com>
From: "Tom St Denis" <tomstdenis AT goplay DOT com>
To: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>, salvador <salvador AT inti DOT gov DOT ar>
Cc: djgpp AT delorie DOT com, allegro AT canvaslink DOT com, balug-lst AT balug DOT org DOT ar
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Reply-To: djgpp AT delorie DOT com

>My notion of slow-down when running on Windows is taken from 
configuring
>and building large GNU packages, those where it takes more than 10 
minutes
>to run the configure scripts and Make.  Overall, on the same machine 
which
>is higly optimized for DJGPP programs both in DOS and in Windows, I
>usually get 30%-40% slow-down for the same task when running from
>Windows.  That's running only one active DOS box under Windows, and 
no
>other Windows programs.  For example, what takes 20 minutes from 
Windows 
>would usually take about 12 minutes from DOS.
>
>I have never been able to figure out just what it is in Windows that 
takes
>so many CPU cycles.  Interestingly enough, if I do something else 
while 
>the compilation runs, like read my mail with Emacs, or type some 
code 
>into the editor, the compilation time is unchanged.  So apparently 
>multi-tasking other virtual machines is NOT what steals the CPU 
cycles.

Well typing into an editor has high delays which will give time back 
to windows.  The 'dos idle interrupt' is used by keyboard handler 
which will give up time while you are typing (remember that the comp 
works at 200 or so MILLION cycles and typing requires so little 
time).  If you ran two builds you would notice a huge slow down.

The intitial slow down is from windows which will still swap and give 
time to explorer and the start menu (I think they are seperate 
tasks...).  So you will always have some delay.  Also disk/io is 
buffered differntly under windows (VCACHE).

Your build while editing probably took longer but not noticebly as 
much.

btw, what is this thread (in the subject) actualy about?  testing 
compilers or windows?

Tom

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