From:	kunst AT prl DOT philips DOT nl
Subject:	Re: Have pity on a neophyte
To:	70233 DOT 1552 AT CompuServe DOT COM (Mark T. Pflaging)
Date:	Wed, 23 Jun 1993 11:44:04 +0100 (METDST)
Cc:	djgpp AT sun DOT soe DOT clarkson DOT edu (DJGPP users list)

Mark Pflaging writes:

MP> 	I would also like some help with compiling a sample program.  The 
MP> "samples" directory contains a few samples but they are pretty lame.  I 
MP> tried to compile "compress.c" and it took like 10 minutes!  Is this 
MP> correct?  The file is only 42k!  I have a 486/33 with 8 meg & a fast 300 
MP> meg hard drive.  I have it set up so that 6 meg RAM is extended memory.  I 
MP> do not have qemm or 386max or any other junk like that.  I took emm386 out 
MP> of my config.sys.  I do have a hard drive cache set up with "SMARTDRV.EXE", 
MP> could this be causing the problem?  Also I am using DOS 5, is that a 
MP> problem?  (DOS is loaded high).  

I have experimented with a lot of CONFIG.SYS and AUTOEXEC.BAT settings
on various hardware using DJGPP. I think on a 8 Mb system the following
settings should work fine (DOS 5 and DOS 6):

config.sys:
===========
DEVICE=C:\DOS\HIMEM.SYS
DEVICE=C:\DOS\EMM386.EXE 5120 RAM      (DJGPP now uses VCPI memory)
DOS=HIGH,UMB

autoexec.bat:
============
LH C:\DOS\SMARTDRV.EXE 2048 2048 /Q


DJ Delorie writes:

DJ> Run "mem".  The search order for memory is as follows:
DJ> 
DJ> 1. expanded memory
DJ> 2. XMS memory
DJ> 3. extended memory
DJ> 
DJ> The first one found will be used.  You want around 4M free to keep gcc
DJ> from paging.  Programs such as SmartDrive and ramdisk eat away at your
DJ> memory very quickly.


MP> 	I am coming from the world of Borland C++ and maybe it has spoiled 
MP> me a little bit.  

Last days a lot of questions appeared on this list regarding the
usage of MAKE.EXE which comes with the latest Borland products.
(Borland C++ 3.1 and Turbo C++ 3.0).
Be aware that the standard MAKE.EXE which comes with these packages
tries to use all available DPMI memory if not instructed otherwise.
You'll notice this by a dramatic slow performance of DJGPP compiles.
There are two solutions to this problem:

(1) if you still want to use MAKE.EXE (and let it use extended memory)
    include the following line in your environment (AUTOEXEC.BAT):
      SET DPMIMEM=MAXMEM 2000

(2) But better: use the MAKER.EXE version which also comes with these
    Borland products. To avoid typos, I renamed MAKE.EXE to MAKEE.EXE,
    and MAKER.EXE to MAKE.EXE myself...
    I have never encountered problems using the real-mode version MAKER.EXE.

I hope this solves the speed problems reported by various users 
of DJGPP and Borland compiler products.


 .^^^^^^^^           _____________________________________
 |      |          / Pieter Kunst (P.J.)                   \
 |  _  _|        /   Philips Research Laboratories,          \
.--(o)(o)      /     Building WY3, Prof. Holstlaan 4,         \
|@      _)   /       5656 AA  Eindhoven, The Netherlands.      |
  | ,___|   /        e-mail: kunst AT prl DOT philips DOT nl             /
  |   /     \_______________________________________________/
  /____\

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