top command shows incorrect memory usage

[Sojin]

The 'used' memory it shows differs from what is real. It differs vastly from what is being shown by 'htop' or System Monitor.
Please see the attached screen shot for more details.
top shows 'used' memory as 7.9 GB, while 'htop' and System Monitor shows it only 1.1 GB.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/997121/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mohan (s-mohaan)]

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