14
votes
1answer
16k views

Why is the “top” command showing a CPU usage of 799%?

I am running a process in a 4 core Ubuntu server. However, top command shows that the CPU usage is 799% all the time. How can this be possible? I know for multi core CPUs, more than 100% CPU usage ...
1
vote
1answer
373 views

Why does top report more than the theoretical maximum CPU usage of a machine?

I would like to know why I have a process being able to report a usage line like: PID COMMAND %CPU 248 Xcode 983.5 … in top on a quad core CPU? I understand it's wrong, but how come? I'm ...