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Superficially, it seems that your machine is using most of the memory right now for file-system buffers and caches ... because it can.
The last thing that Linux wants to do is to have memory available to it that isn't being used for something. If there is no "pressure" for memory, as in your case, then it will squirrel-away things in every cubbyhole that it can find. These cubbyholes will be the first things to be discarded if-and-when memory pressure starts to develop.
For instance, if you ever read a file, or ever used a command, then data related to these things will hang-around in memory just in case you do use them again (which is actually "quite likely"). This is why we say that operating systems are designed to be very lazy.
Last edited by sundialsvcs; 08-19-2016 at 02:53 PM.