On the top right you see numbers marked "buff" and "cached". That is the amount of memory currently being used for caching.
Eric
Jason KRISCH wrote:
Is anyone else seeing this:
My laptop has 512MB RAM. When I first boot into X, about 25% of my memory is being used - I can live with that. Then I open some apps, say Mozilla, and I jump up to 59% memory utilization. If I close all the running apps, my % of memory utilization NEVER decreases. If I open up apps again, it just gets worse and "builds" from where it was. Today the laptop was running for about 8 or 9 hours and before I shut it down I was pegged at 100% memory utilization with no apps running. I used top and the system monitor to try to figure out what was using all of it, but nothing really stood out as using a lot. I plan on doing some more digging and trying to figure out where / what the problem is - I just thought I would throw this out there to see if anyone else is experiencing similar issues.