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
