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From: gaynor@agvax2.ag.ohio-state.edu
Subject: Re: SE/30 VM trouble in System 7
Message-ID: <1991May29.125650.16389@zardoz.eng.ohio-state.edu>
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References: <2842d41f.4648@petunia.CalPoly.EDU>
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Date: Wed, 29 May 1991 12:56:50 GMT

In article <2842d41f.4648@petunia.CalPoly.EDU>, mjohnson@cosmos.acs.calpoly.edu (Mark S. Johnson) writes:
>
>I'm running the release System 7 with no inits on a 5 Meg SE/30 with
>an Apple internal 40 Meg HD. When I turn on VM with the default
>settings and then reboot, "About This Macintosh" says:

[stuff about how 5MB of VM eats 10MB of disk space]

Yep, that's the way it is.  2 MB of VM eats up 4 MB on my HD.  (Aiigh! 
Acronyms!).  Now, I'm not a systems programmer (my knowledge is much more in
theory than in hard code), but I'd hazard that the extra disk space
is used to keep track of usage, what's where, and to generally speed up the
addressing of VM.  I'm sure that Apple could have implemented VM in a fashion
to devour less disk space, but such an implementation would probably eat up
more physical RAM.

Of course, I could be totally off-base.  <grin>  But VM does tend to eat up
around 2 MB of disk space for each MB of VM.

---
Jim Gaynor - AgVAX System Manager - Academic Computing - Ohio State University
VMS:<gaynor@agvax2.ag.ohio-state.edu>  UNIX:<gaynor@magnus.acs.ohio-state.edu>
Disclaimer : All opinions expressed here are mine and only mine.  So there!
Witty Quote: "Think, think, think, think..." - Winnie-the-Pooh, Taoist Bear.