To: opendos AT delorie DOT com
Date: Tue, 5 Dec 2000 02:01:18 -0800
Subject: Re: VM (was BASIC & EMS, nee Optimizing CONFIG.SYS...)
Message-ID: <20001205.020928.-543121.1.domanspc@juno.com>
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From: Robert W Moss <domanspc AT juno DOT com>
Reply-To: opendos AT delorie DOT com

Right Joe.
Here I am dreaming again, while reading my E-Mail on MSWIN98.
Of course you got me.  At some point a program will request  
more memory than is physically present on your computer. 
That is when an operating system like M$WIN9X  will  call up a 
least-recently used (LRU) algorithm that determines what 
portion of memory it can free up by writing the contents
 to a disk-based swap file if necessary. Once the swap file is 
updated, the physical memory addresses can be overwritten 
with the data requested by the program. In MSWIN9X/ME this 
is called SWP386.  It will be placed on the c:\ drive by default 
and sooner or later it can grow so large that you can not even
save a file to disk C:\.  It is recommended that you put it on 
your fastest hard drive unless that is C:\.  It would be best to 
make a small partition about 3 times as large as your system 
ram and put the SWP386 file there, where it will not interfere 
with what you have on program or data partitions.   I have had 
my SWP386 file grow to over 4GB and freeze up my computer 
after using the internet for 5 or 6 hours, and I have 32MB of 
system ram installed.

I will try not to mix WINDOWS stuff up with DOS in future.

BOB "DOMAN" MOSS"  'Chocolate is a vitamin.' 

On Tue, 5 Dec 2000 13:56:07 +1100 "Da Silva, Joe"
<Joe DOT DaSilva AT emailmetering DOT com> writes:
> Ummm ... don't you mean "INfrequently used"? At least I hope so.  <g>
> 
> Joe
> > -----Original Message-----
> > From:	Robert W Moss [SMTP:domanspc AT juno DOT com]
> > Sent:	Tuesday, 5 December 2000 10:42
> > To:	opendos AT delorie DOT com
> > Subject:	Re: BASIC & EMS (was: Optimizing CONFIG.SYS...)
> > 
> > Virtual memory is not "memory".  It is the swap space on the 
> > hard drive which is used to opn up space in real memory by 
> > copying frequently used information out to the hard disk 
> > where the program can call it up when needed.  
> > It is slow because it is limited to the access speed of the hard 
> drive.
> > 
> > BOB 'DOMAN" MOSS 'Chocolate is a vitamin, but also a vegetable, 
> >                                           since it comes from a 
> bean. 
> > Everyone should 
> >                                           eat their veggies.) 
> > 
> > On Sat, 2 Dec 2000 12:31:06 -0700 "Patrick Moran" 
> <pmoran22 AT yahoo DOT com>
> > writes:
> > > 
> > > That is what I have been trying to say, it is extended memory 
> and 
> > > yes it is
> > > real physical memory, it is not virtual memory. You can touch 
> the 
> > > chips,
> > > feel them get warm and use that memory. XMS itself is a memory 
> > > manager,
> > > however the memory used through XMS is refered to as XMS memory.
> > > Pat
> > > 
> > > 
> > > 
> > 
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