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From: pcb@gator.cacs.usl.edu (Peter C. Bahrs)
Newsgroups: comp.windows.ms
Subject: Win3 8086 Virtual Machine, again
Message-ID: <9983@rouge.usl.edu>
Date: 13 Jun 90 03:32:03 GMT
Sender: anon@rouge.usl.edu
Organization: The Center for Advanced Computer Studies, USL
Lines: 46


>
>From: markg@cbnewsk.att.com (mark.r.gibaldi)
>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,
>>   ......
>
>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......
>

Well I solved the problem (I think).  For Edix and Procomm   .exe's I ran
exehdr.  I think I got this with DOS or MS C compiler.  It listed
the amout of memory needed, static I think.  I added 5 to this and
used it in the PIF settings.  FINE.!!  I pulled up 5 edix and 3 procomm
just to see.

But I think this logic does not hold for files with overlays????  
Quick C listed only 5k needed which definitely did not work.  

I don't believe Edix and Procomm use overlays.  

Is this the best approach to determine a PIF amount setting?


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| Peter C. Bahrs                                                         |
| The USL-NASA Project                                                   |
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