What's happening with 16.04 & 16.10? 100% of RAM being used by nothing!

[Ralf Mardorf]

On Wed, 05 Oct 2016 22:32:00 -0400, Ken D'Ambrosio wrote:
>You are almost certainly worrying over nothing. Unfortunately, your
>'top' screens hot left out the right-hand side of the screen, but I
>imagine you will find your "missing" RAM allocated to caching, which
>the OS can use to speed things up, and reclaim dynamically as needed.

Running

  df -h

does show, if tmpfs does require the memory. Indeed, Linux does use
memory in a smart way, but it's anyway strange that 30 G are used
directly after startup finished. What exactly should require several
tens of G after startup? I'm quite sure that something is fishy and
that the OP should worry much.

Btw. instead of booting into rescue mode and posting a pic of htop, atop
or whatever, consider to start an Unity user session and to run

  top

push Ctrl+C and copy and paste the output without line wrapping.

Regards,
Ralf