Around 04:12pm on Wednesday, June 20, 2007 (UK time), Fung scrawled:
When the system is fresh reboot, there is below 1GB of used memory and as times go , the used memory increased to over 3.5GB.
Is there a way to free memory out like those program which works under Windows?
Basically you shouldn't want to, Linux is very efficient in using all the memory available. It will handle it for you, and you need not worry about running out.
There are lots of explanations of this on-line, here for instance: http://gentoo-wiki.com/FAQ_Linux_Memory_Management
Steve