Date: Thu, 18 Aug 1994 17:14:46 -0700 (PDT)
From: "Frederick W. Reimer" <fwreimer AT crl DOT com>
Subject: Re: Why djgpp 1.12 is so slow on my 486PC
To: tyuan AT beta DOT wsl DOT sinica DOT edu DOT tw
Cc: djgpp list <djgpp AT sun DOT soe DOT clarkson DOT edu>

On Thu, 18 Aug 1994 tyuan AT beta DOT wsl DOT sinica DOT edu DOT tw wrote:

> Recently, I put djgpp 1.12 on my system.  After I try to run
> test programs under subdirectory `tests', for example, t02.bat,
> I find out w/
> 	device=c:\dos\emm386.exe noems
> in my config.sys
> then, I can get my answer in seconds.
> BUT if I remove that line from config.sys
> then I must spend 45 minuates to get the answer.
> 
> Does anyone know what is wrong w/ my system? OR to put
> `device=c:\dos\emm386....' in config.sys is a necessary
> procedure.

It's my understanding, but I'm not totally positive, that DJGPP requires 
either DPMI or VCPI in order to use extended memory.  emm386 privovides 
for DPMI (and for VCPI if you give it a RAM option), and allows DJGPP to 
use your extended memory.  If you don't have this, it only uses 
conventional memory, and pages to disk a lot more.  Someone correct me if 
I'm wrong...


Fred Reimer

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