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I am setting up a home server for plex, storage, and a few VMs. I have everything loaded and running and was checking to what ram I had left to start a few VMs and noticed I was using more than half of my ram and hadn't even started a VM yet. I ran "sudo htop" to see if I could find out what was using it, but it doesn't show much. Haven't been using Linux long, but I thought it was very lite on resources. Is there another application I can use to find out what is using the ram?

    bob@ducktape:~$ uname -a
    Linux ducktape 4.4.0-112-generic #135-Ubuntu SMP Fri Jan 19 11:48:36 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

    bob@ducktape:~$ free -m
                  total        used        free      shared  buff/cache   available
    Mem:          48291       26613       18648          28        3029       20595
    Swap:             0           0           0

    bob@ducktape:~$ ps aux --sort -rss | head -n 5
    USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
    plex     19720  9.3  1.2 1177412 597384 ?      Sl   00:11  71:45 /usr/lib/plexmediaserver/Plex Media Server
    plex     19789  0.0  0.1 344168 92808 ?        Sl   00:11   0:28 /usr/lib/plexmediaserver/Plex DLNA Server
    plex     19748  0.1  0.1 1857400 66116 ?       SNl  00:11   0:46 Plex Plug-in [com.plexapp.system] /usr/lib/plexmediaserver/Resources/Plug-ins-f54242b6b/Framework.bundle/Contents/Resources/Versions/2/Python/bootstrap.py --server-version 1.10.1.4602-f54242b6b /usr/lib/plexmediaserver/Resources/Plug-ins-f54242b6b/System.bundle
    plex     19822  0.0  0.0 955492 47048 ?        Sl   00:11   0:12 Plex Plug-in [com.plexapp.plugins.WebTools] /usr/lib/plexmediaserver/Resources/Plug-ins-f54242b6b/Framework.bundle/Contents/Resources/Versions/2/Python/bootstrap.py --server-version 1.10.1.4602-f54242b6b /var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Plug-ins/WebTools.bundle

bob@ducktape:~$ free --si -h
              total        used        free      shared  buff/cache   available
Mem:            49G         27G         19G         29M        3.1G         21G
Swap:            0B          0B          0B

htop output

Dartrunner
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    Please include the output of free -m – vidarlo Feb 04 '18 at 17:47
  • How can I copy from putty and get it to maintain formatting? – Dartrunner Feb 04 '18 at 17:53
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    Copy/paste your formatted text, mark it and click on '{}'. Works only in questions and answers, not in comment. – muclux Feb 04 '18 at 17:56
  • 20GB memory used is unreasonable, unless you have a few VM's or other heavy services. What does ps aux --sort -rss | head -n 5 show? – vidarlo Feb 04 '18 at 17:57
  • So plex is the memory hog. I don't know how plex uses memory, but googling indicates that you're not the only one... – vidarlo Feb 04 '18 at 18:03
  • Why does htop show only 1.2%? Is that not an accurate picture of my system? – Dartrunner Feb 04 '18 at 18:06
  • You have multiple plex processes. Also you have a snap that consumes a bit. – vidarlo Feb 04 '18 at 18:09
  • How do I mark this as answered? and thanks for the information. I will research the ps command. And sorry I can't seem to figure out the command formatting. – Dartrunner Feb 04 '18 at 18:10
  • @Dartrunner Either wait for someone to post an answer or post an answer on your own. That's perfectly ok. Then mark the given answer (which may be yours) as accepted by clicking the gray hook until it turns green. – PerlDuck Feb 04 '18 at 18:14
  • 1.2% isn't that much of memory being used. Of 48GB 1.2% is only 0.576GB. Try looking at free --si -h as a command or something like that. It might be caching that is using up so much and that will be released when needed. – Terrance Feb 04 '18 at 18:17
  • This answer here: https://stackoverflow.com/a/20277787/2012250 allows you to actually see the amount of RAM being used by a specific application. – Terrance Feb 04 '18 at 18:28
  • This could work if some would show us how to apply to Pex....https://askubuntu.com/questions/120765/memory-limiting-solutions-for-greedy-applications-that-can-crash-os – EODCraft Staff Feb 04 '18 at 18:28
  • I think I figured it out after much googling and reading the comments. I am using ZFS and its mem usage is not reported anywhere. Thanks for the help, and the comments led me in the direction I needed. – Dartrunner Feb 04 '18 at 20:18

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