I'm using Ubuntu 12.04 (precise) 64-bit ,It uses 8GB RAM [closed]

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I'm using Ubuntu 12.04 (precise) 64-bit, My system configuration is Memory: 7.8 GB and Processor :Intel® Core™ i 7-2600 K CPU @ 3.40 GHz × 8 , in system monitor resource page it shows using 7.4 GB RAM but overall process in process page uses around 3 GB RAM, how to find the which process using the reaming RAM and how to solve this problem.

Answer 1

7.4 GB of memory is quite much. The system is probably allocating memory for buffers, and not all that memory is actually used.

You can inspect memory usage by running top and then pressing M (to sort processes for memory usage).

Answer 2

It most likely not using all that ram, this is a very common misconception when using linux. Linux is using memory that isn't being used for disk caching, if you start something that needs ram linux will stop to use it.

http://www.linuxatemyram.com/

Also, this question is more fitted for SU or askubuntu than stackoverflow.