linux RSS from ps RES from TOP

Question

Linux : RedHat/Fedora

What is the difference between these memory values:

• RES from top command
• RSS from ps command

Answer 1

If you are talking about the difference between the RES column in top -p $(pidof process) and the RSS column in the ps aux | grep $(pidof process) command, there is no difference, as both the tools get this value from the /proc/$(pidof process)/stat file.

You can always cat /proc/$(pidof process)/status for a human readable format.