Path: utzoo!attcan!uunet!snorkelwacker!apple!mips!sjsca4!poffen
From: poffen@sj.ate.slb.com (Russ Poffenberger)
Newsgroups: comp.windows.ms
Subject: Re: Win3.0 - More questions
Message-ID: <1990Jun13.152605.14354@sj.ate.slb.com>
Date: 13 Jun 90 15:26:05 GMT
References: <9906@rouge.usl.edu> <1990Jun12.140525.7945@cbnewsk.att.com>
Reply-To: poffen@sj.ate.slb.com (Russ Poffenberger)
Organization: Schlumberger Technologies, San Jose, CA.
Lines: 41

In article <1990Jun12.140525.7945@cbnewsk.att.com> markg@cbnewsk.att.com (mark.r.gibaldi) writes:
>In article <9906@rouge.usl.edu> pcb@gator.cacs.usl.edu (Peter C. Bahrs) writes:
>>Round 2 of questions/comments:
>>
>>In general WIN 3.0 is awesome! (wrt win386, and all of my X envts.)
>>
>>1) Does win3 give each dos application a virtual 8088 machine when in
>>   enhanced mode?
>>   I have 9 mb memory (2 real and 8 swap) available and can only
>>   run 1 copy of edix and 1 procomm...then is says out of memory,
>>   kill an application.  Sooooo, the answer to this questions appears
>>   to be :  ?? no, they still share 640k. 
>>
>
>Hmm...  In systems (OS) that use paged virtual memory as does Win 3.0, virtual
>memory on disk does have limitations.  Programs have a certain number of
>memory pages which MUST be held in RAM in order for the processing to
>continue, or be continuable.  This is called a "working set".  If the
>working set of your active programs exceed the amout of RAM that you have,
>all the virtual memory in the world won't do you much good.  The above
>example does not prove that Windows 3.0 does or does not use virtual machines
>as advertised.  It could be merely that the combination of Win 3.0 and the
>active DOS apps had a total working set greater than could be held by
>Peter's installed 2mb of RAM.  I think we need to hear from some people
>who have large amounts of memory installed.  I have the same setup as
>Peter on a 25mhz 386.  However, I plan to put in much more RAM shortly.
>

I have a 25Mhz 386 with 8Meg ram. I have been able to get 3 DOS windows and
two other windows running DOS applications at once, as well as a number of
windows apps. I did not try to open more, but probably could.

The statement that non-windows apps must reside entirely in RAM is probably
correct. It may be able to swap an ENTIRE virtual session to virtual memory,
but I don't know for sure.


Russ Poffenberger               DOMAIN: poffen@sj.ate.slb.com
Schlumberger Technologies       UUCP:   {uunet,decwrl,amdahl}!sjsca4!poffen
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