Tags

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http://www.linuxatemyram.com/index.html

The link explains and experiment actual free memory for apps.
             total       used       free     shared    buffers     cached
Mem:            31          0         31          0          0          0
-/+ buffers/cache:          0         "31"
Swap:            2          0          2

To clear cache:
$ echo 3 | sudo tee /proc/sys/vm/drop_caches 

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