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From:	"Silvano Mantione" <mantione AT tele2 DOT it>
Newsgroups:	comp.os.msdos.djgpp
References:	<AGMkb.445$947 DOT 280 AT nntpserver DOT swip DOT net> <3f944c94 DOT sandmann AT clio DOT rice DOT edu>
Subject:	HELP with DPMI under DOS - Conclusion
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I success to allocate 1022Mb with cwsdpmi5 with swap file, and with pmode13.
Under pmode the  _go32_dpmi_remaining_physical_memory() report 4Gb avaiable,
(I have 1Gb installed).
I notice that sbrk uses integer so I suppose that it as the same limit of
2Gb of malloc.
If I buy more RAM bringing my system memory to 3Gb I can use sbrk?
(Maybe I will try and maybe I will Charles let know).

Filosophic question.
I'm really interested in performance to get the best from my PC.
It is the pmod with djgpp with Dos the best I can get?
What about a real 32bit enviroment like Dos32 (if it is) ( I see there is a
"dos32 extention for djgpp"),
or a simple linux boot disk with single user and no multitasking.

Thank You
Silvan






"Charles Sandmann" <sandmann AT clio DOT rice DOT edu> wrote in message
news:3f944c94 DOT sandmann AT clio DOT rice DOT edu...
> > I'm tryuing to allocate an array of 1023Mb on a PC with 1Gb RAM
installed
> > but I can't success.
>
> How are you trying to allocate the memory?  I would suggest you use
> sbrk() to allocate such large chunks.  I also suggest you remove EMM
> providers from your configuration, and tell us what GO32-V2 prints.
>
> In my testing, I routinely allocate 2GB of memory for testing CWSDPMI,
> so I know it works.  It will fail if you disable paging and try to
allocate
> more than about 500MB.  The long term fix for this is to use 4MB pages,
> which is available in CWSDPMI r6 wip/test release.
>
> > I try do modify the parameters of cwsdpmi with
> > cwsparam, I also try pmode/dj, but nothing to do.
>
> I've also allocated 2GB of memory with the most recent pmode/dj - so this
> points to maybe something in your configuration or how you are trying to
> allocate the memory.
>
> > I'm writing an application
> > memory critical and I'm planning to buy 2Gb more memory (3Gb total) do
> > someone have some idea to how can I allocate this memory in a single
array
> > under DOS?
>
> If you are planning to use more than 2GB, you *MUST* use sbrk() for
> allocation.  (There are limitations in malloc() which will prevent you
> from using more than 2GB in a single allocation).
>
> Using 3GB (or 4GB) of memory under DOS in a single array has generated
> lots of email to me - but so far no one has built a machine and tested
> more than 2GB of physical usage - and sent me results.
>
> You will want to use the r6 test release if you plan to use more than
> 500MB.

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