I'm running FMP 5 Unilimited (connected to WSC on OS X Server 1.2 w/Apace) on an iMac (333Mhz) and I've just upgraded from 64Megs of Ram to 160Megs. I had always ran VM "on" only using 1 Meg on the HD, Back when 8.6 came out I remember reading that this was good as it reduced the Memory requirements for most Apps, and the System.

Now I've got plenty (70 allocated to FMP - it only seems to be using about 50). So I'm just wondering is there ANY reason performance wise that I should leave VM turned on?

Thanks,

-Arin

My understanding was that by turning on VM you were turning on the memory management component of the OS. I have always noted that the amount of RAM used by the system decreases once VM is turned on. I suppose this would be especially pertinent when running numerous applications. With one application I imagine there would be minimal benefits.

Basically Apple says that VM helps with memory mapping, so only "necessary" portions of the apps code are loaded in physical RAM. It's an advantage for running multiple apps, but in the instance of a single app (FMP Unlim running in a web server RAIC set up) VM doesn't help at all.

See Apple's "Knowledge Base" Article ID: 16889

Power Macintosh: Turn on Virtual Memory for Best RAM Usage

http://kbase.info.apple.com