Advantage of QDPMI over QEMM alone for Borland C++ DOS

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2 total messages Started by Eric A. Raymond Sun, 24 Jan 1993 01:59

#1888

Author: Eric A. Raymond
Date: Sun, 24 Jan 1993 01:59

11 lines
875 bytes

What advantage does using qdpmi on top of qemm buy me?
  - speed
  - functionality

Basically I use Borland C++ under DOS only (nmo windows). 

I know that QDPMI will give me virtual memory, but BC++ will also swap
out to disk on its own.

(I originally thought that BC++ 3.1 required a DPMI server to run. but
that does not appear to be the case.)

Re: Advantage of QDPMI over QEMM alone for Borland C++ DOS

#1889

Author: "Malcolm S. Muir"
Date: Sun, 24 Jan 1993 11:04

32 lines
1820 bytes

In article <1993Jan24.015955.17221@kronos.arc.nasa.gov> raymond@kronos.arc.nasa.gov writes:

>What advantage does using qdpmi on top of qemm buy me?
>  - speed
>  - functionality

It adds DPMI functionality support to QEMM. No speed advantage at all.

>Basically I use Borland C++ under DOS only (nmo windows). 
>
>I know that QDPMI will give me virtual memory, but BC++ will also swap
>out to disk on its own.
>
>(I originally thought that BC++ 3.1 required a DPMI server to run. but
>that does not appear to be the case.)

BC++ 3.1 does require DPMI support. If it finds none as it loads, it
loads it's own, which it removes on exit. This is documented
(somewhere) in the manuals.

If you have QDPMI loaded, it uses that rather than it's own DPMI
support. So far I find the Borland driver 100% reliable whereas the
QDPMI driver falls over on large multimodule compiles running from a
makefile.

-- 
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Malcolm S. Muir                              EMAIL: malcolm@muir.demon.co.uk
Sunderland                                   CIX: mmuir BIX: mmuir
England                                      CSERVE: 100012,31
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