Newsgroups: comp.sys.mac.system Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!zardoz.eng.ohio-state.edu!agvax2.ag.ohio-state.edu!GAYNOR From: gaynor@agvax2.ag.ohio-state.edu Subject: Re: SE/30 VM trouble in System 7 Message-ID: <1991May29.173052.17108@zardoz.eng.ohio-state.edu> Sender: news@zardoz.eng.ohio-state.edu (Usenet news) Nntp-Posting-Host: agvax2.ag.ohio-state.edu Reply-To: gaynor@agvax2.ag.ohio-state.edu Organization: Ohio Cooperative Extension Service References: <2842d41f.4648@petunia.CalPoly.EDU> <1991May29.125650.16389@zardoz.eng.ohio-state.edu>,<53439@apple.Apple.COM> Distribution: usa Date: Wed, 29 May 1991 17:30:52 GMT In article <53439@apple.Apple.COM>, blob@Apple.COM (Brian Bechtel) writes: >gaynor@agvax2.ag.ohio-state.edu writes: >>In article <2842d41f.4648@petunia.CalPoly.EDU>, mjohnson@cosmos.acs.calpoly.edu (Mark S. Johnson) writes: > >>[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. > >No. VM uses 1 MB of hard disk for each MB of memory, with ALL memory >counting towards the total. If you ask for 15 MB of memory, then VM >takes up 15 MB of disk space, no matter how much RAM is in your >computer. If you specify 12 MB on an 8 MB RAM SE/30, you create a 12 MB >invisible file called "VM Storage". Well, then in an odd sense I was right. Note, Brian, that I said 2 MB of -VM- eats up 4 MB on my HD. I also have 2 MB of RAM. Thus, 4 MB for "VM Storage". It also makes sense for Mark - he has 5 MB RAM, 5 MB VM, so a 10 MB VM file. I had been wondering why a 1 MB VM setting took up 3MB for the VM storage file. Now I at least know the equation. Brian, could you enlighten us a bit as to why it works in this fashion? I mean, it seems odd to me that, according to what you've just said, someone with 8 MB RAM who added 1 MB VM (for 9 MB total) would have a VM Storage file of 9 MB in size. From this, it would appear that Virtual Memory, even in small portions, would require -huge- amounts of disk space for those with large amounts of RAM. --- Jim Gaynor - AgVAX System Manager - Academic Computing - Ohio State University VMS: UNIX: Disclaimer : All opinions expressed here are mine and only mine. So there! Witty Quote: "Think, think, think, think..." - Winnie-the-Pooh, Taoist Bear.