I have the same bug reproduced on my machine. details below. among top, htop and system monitor, the results shown by system monitor seems to be the correct in my case
Distributor ID: Ubuntu Description: Ubuntu 13.10 Release: 13.10 Codename: saucy ** Attachment added: "top, htop, system monitor all showing different memory usage" https://bugs.launchpad.net/ubuntu/+source/procps/+bug/997121/+attachment/3920606/+files/all.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/997121 Title: top command shows incorrect memory usage To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/procps/+bug/997121/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs