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Here used size is around 11GB free only 40MB, we dont know why OS taking more memory. Only mysql is running in this server, which is taking 30% of RAM, remaining space using my OS.
How to check the process which is taking more memory?
Over 2/3 of your memory is used by the file cache. That is normal and healthy operation of your system. It is not something you should worry about, diagnose, or try to "correct".
If you want to know more than that, do a forum search and read a few of the hundreds of times this same question has been asked and answered.
The 'used' memory includes large amounts of disk cache. It's 'used' in the sense that Linux is making use of it, rather than it sitting idle. However, it can also be called 'free' since if a program wants memory it will be made available for that program.
Run the command 'free' and you'll get an output like the following:
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