Date: Wed, 31 Jul 1996 08:39:11 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
To: PENG ZHOU <pengzh AT ix DOT netcom DOT com>
Cc: djgpp AT delorie DOT com
Subject: Re: DJGPP Runs Slow(DPMI)?
In-Reply-To: <4tl6bk$oej@dfw-ixnews2.ix.netcom.com>
Message-Id: <Pine.SUN.3.91.960731083247.1793J-100000@is>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII


On 30 Jul 1996, PENG ZHOU wrote:

>     I am running windows 95 and also will be able to switch to DOS mode
> by selecting restart computer in DOS mode.  But it seemed that the
> W95's SPMI emulator runs faster and make DJGPP programs runs faster
> than if it were in DOS using DPMI(CWSDPMI).

Details, please.  What programs did you run, what do those programs do 
most of the time (if you run programs supplied with DJGPP, just tell 
what is the command line you used to invoke them), what is the difference 
in the elapsed times, etc.  It is impossible to comment on this issue 
unless you tell at least that much.

In general, if your programs mostly do file I/O, then you should expect 
them to be twice as fast under Win95, because it bypasses DOS completely 
and does all file operations in 32-bit protected mode.  This has nothing 
to do with the DPMI services, you just run on faster operating system.  
(When in DOS mode, the 32-bit file access feature doesn't work.)