If you run 'free -m', it shows this for example:
PHP Code:
$ free -m
*********total*****used****free***shared**buffers* *cached
Mem:*****1003*****998**** 5 *** 0 ** 23 ** 764
-/+ buffers/cache: ***210 ****793
Swap:*** 2045 ****147*****1897
Here, all ram is filled up, but only 210MB is actually in use. The rest is just caching of files, to improve overall speeds.
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