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At 09:41 AM +1000 05/04/2004, David Elmo wrote:<changed subject line reflecting calmer attitude>
er ... sorry, yes I meant digests... sudden panic, sense of loss caused me to stumble with words... :)
hehehehe. Yea, that day without LEM was kind of boring! :) (I'm really not fond of digests; they incur the same data transfer but add gratification delay)
It helps to check the maclaunch archives now and then. That way you can see if it's an individual problem or if the whole list is cluster fuched.
OK, serious question: I hear it said to turn off VM if one has say 500 MB of Ram or more... Why?
IMO, there are only three reasons to turn off VM:
1) You need the extra performance during audio/video capture or poorly written game.
2) You're a photoshop geek and need that xtra 3% performance and have already used all your HD space to build Photoshop-scratch volumes.
3) You have a boatload of RAM and very little free HD space, so you don't have room for the swapping/paging file.
Turning off VM (in OS 8.6 and later) disables part of the shared library manager. This decreases system performance by about 1%.
Is it that when VM is on, the whole memory allocation is randomly or widely used (thus immediately bringing on the slowness of seek and read of HDs into the equation)? If real memory is always used first and VM used as "overflow"
then it seems to be a plus to have it on.
Even when VM is off, paging translation still occurs in the processor. So there is no performance diff there.
The system doesn't start paging things out until most of your RAM is used. So when you have lots of RAM, that's not usually an issue.
One diff you will see... With VM off, the entire application is loaded when launched. That makes for longer launch delays but less read i/o while the app is running. With VM on, parts of the app may not be read until they're actually needed. This makes for faster launches, saves memory, but then incurs read i/o at a later time.
- Dan.
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