[CentOS] How To Free memory

Hi All,

My CentOS 5.0 is running on x86 machine with 4GB RAM. It runs as a webserver
and there is a small java applet application.

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?


Thank you.
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