How much memory is Linux really using?

An htop on my system reveals this:

htop

memory_in_linux

So you would think that I am using about 4 gigs of Memory.

The “Mem” line is misleading so please do not use that. instead use the following command:

free -m

Pay attention to the -/+ buffers/cache line.
memory_in_linux2


Useful Websites

Linux ate my RAM
http://www.linuxatemyram.com/

Using top more efficiently
http://www.linuxforums.org/articles/using-top-more-efficiently_89.html

Experiments and fun with the Linux disk cache
http://www.linuxatemyram.com/play.html

Clear RAM Memory Cache buffer and Swap Space on Linux
http://www.tecmint.com/clear-ram-memory-cache-buffer-and-swap-space-on-linux/

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