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So here's memory usage on my machine (Ubuntu 16.04):

Memory usage

And here are the processes sorted by memory usage:

Process list

Now there's no way the total memory usage in the process list adds up to 12.1GB. I thought maybe it wasn't showing me everyone's processes so I ran sudo top but the process list is no different. Running free gives me: total used free shared buff/cache available Mem: 16309600 12120668 2448244 360100 1740688 3364068 Swap: 16654332 3153716 13500616

So I don't think it's the cache.What's going on here? Why is memory usage so high?

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    Linux is not Windows and uses RAM differently. Your pictures show what is using how much RAM. Unused RAM is wasted RAM. Do you have a problem or just asking about RAM use ? See linuxatemyram.com – Panther Apr 6 '17 at 17:30
  • It looks like you've removed your username from the output. Gnome system monitor doesn't display all processes by default. You have to enable it to see all usages. There might be more processes started by other users – Anwar Apr 6 '17 at 17:41
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    See also - askubuntu.com/questions/53264/… and there are bug reports about the graphical programs not showing correct information. – Panther Apr 6 '17 at 17:42
  • @Anwar, that's why I used top to make sure I saw all processes. – Johnny Apr 6 '17 at 17:43
  • We don't see your top output here! – Anwar Apr 6 '17 at 17:46

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