OS8 Memory Problems

Posted on 1998-08-17
Medium Priority
Last Modified: 2012-05-11
I'm running OS8 on a Mac6500/250MHz with 48megs of RAM - lately the system is going from using roughly 15 megs of RAM to anywhere up to 24megs or so (it keeps getting worse!) - sometimes after opening several aps (all have their memory levels set so as to be able to run simultaneously), and sometimes before i open any app.  I've tried playing with the cache size, to no avail.  I know more RAM would help, but I can't afford it right now, and don't know if the system would eat that up, too!  It's really making life difficult . . . I'd rather not go back to OS7.5 . . . Help, please!
Question by:nogoddess
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Accepted Solution

TheHub earned 300 total points
ID: 1536091
Go to the Memory Control Panel.
Turn on Virtual Memory. Set the size of VM to a number greater than your physical RAM that is divisible by 32 (64, 96, 128, etc.)
Set the cache size to 1536 (48 * 32 = 1536).

Now you are ready for the hard part. All applications use RAM in a contiguous fashion. If you launch and quit and launch and quit apps, the RAM will become fragmented and the larger applications will not be able to fit into the available spaces. example:
the finder uses 2 megs
netscape uses 8 megs
photoshop uses 20 megs
eudora uses 4 megs
quark uses 10megs
=44megs leaving 4 megs free

You quit netscape and reclaim 8 megs, but the app you want to use wants 12 megs, but it won't fit between the finder and photoshop (8meg hole) and it won't fit after quark (4meg hole) even though the free RAM = 12megs.

The system heap was designed to be growable. As the system needs more space, it takes it. If you train yourself to launch the applications that you are least likely to quit first, you will not lose so much RAM to the system. When the RAM gets fragmented and you forget the order in which you launched them, you need to quit all applications and start over. Virtual Memory will also speed things up a bit and your applications will not need use as much RAM on MacOS 8.1. this is exactly opposite of Systems prior to MacOS 8.x.

-good luck

Author Comment

ID: 1536092
Uh . . . maybe I'm being a complete idiot now, but I'm not finding any virtual memory settings for OS8 in the control panels - the memory control only allows you to set the cache size and the RAM disk

Expert Comment

ID: 1536093
Does your control panel look similar to this:

Find the cursor. Everything in the area is VM related.

Author Comment

ID: 1536094
Hey - Nope, it doesn't look like that, used to in OS7.5, but not in OS8 - it looks like this now:


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