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You are here: MacNN Forums > Enthusiast Zone > Classic Macs and Mac OS > How to change VM value down?

How to change VM value down?
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Dedicated MacNNer
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Dec 28, 2000, 12:57 AM
 
I have a G4 400, 9.0.4 and 448 RAM. After reading a topic I'm turning my VM on just to see what happens... but I want to leave it with 1 MB only, but I'm not beeing able to change the value under 449?! Why?


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Clinically Insane
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Dec 28, 2000, 01:57 AM
 
That value is your total RAM.
449 total - 448 physical = 1 virtual
It simply shows the TOTAL RAM you will have on reboot rather than how much is actual VM.

Cipher13
     
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Dec 28, 2000, 02:51 AM
 
No, Cipher, 449 is the amount of space that is used on the disk, and indeed it's the total of available ram:

To work properly, the VM is equal to 'your ram' + 'what you want'

On *nix, you must often make a partition for the VM, it is suggested to choose a size = 2 x 'your ram' (or 1.5 * 'your ram', I don't remember)


Well, if you have 448 MB of RAM, you should turn Virtual Memory OFF instead of setting it to 1 Mo



[This message has been edited by noliv (edited 12-28-2000).]
-noliv
     
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Dec 28, 2000, 03:45 AM
 
Hey guyz? Who's right here?

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Dec 28, 2000, 03:52 AM
 
actually, cipher is right too, but the space that is occupied by the VM invisible file is not 1 MB but 449...

-noliv
     
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Dec 28, 2000, 02:23 PM
 
No, they're not both right. 448MB RAM +1 is the amount of VM used on the hard drive. Physical RAM +1MB is the lowest setting available in the Mac OS.

Scott
     
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Dec 28, 2000, 07:16 PM
 
Fine, I'll rephrase:

That value is your total RAM.
449 total - 448 physical = 1 virtual
It simply shows the TOTAL RAM you will have on reboot rather than how much is actual VM.
Now the 449 ALSO shows how much disk space will be reserved by the Virtual Memory Storage file.

Cipher13

[This message has been edited by Cipher13 (edited 12-28-2000).]
     
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Dec 29, 2000, 02:39 AM
 
Hey guys... thank you so much for your help , BUT, I guess I'm going to leave the VM OFF for a while...
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Clinically Insane
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Dec 29, 2000, 02:59 AM
 
Your loss (er... gain in HD space )

Cipher13
     
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Dec 29, 2000, 03:35 AM
 
Originally posted by slboett:
No, they're not both right. 448MB RAM +1 is the amount of VM used on the hard drive. Physical RAM +1MB is the lowest setting available in the Mac OS.
It's funny, we all agree each other...
I don't know if what I wrote is correct, but what I wanted to write was correct (maybe a translation mistake... I'm tired to talk in english...)

-noliv
     
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Dec 29, 2000, 05:36 AM
 
We're both right, we just each left out a detail

Cipher13
     
   
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