High CPU - where is my missing percentage???

Unanswered Question
Jun 11th, 2009
User Badges:

Hi,


I have a quick question: my CPU is running as follows:


CPU utilization for five seconds: 79%/73%; one minute: 43%; five minutes: 27%


So why is it, when I add up the 5 sec % from all of the processes used, it equals 1.55%? What is using the other 77.45%, because frankly that seems like somewhat more important. Or is it that I am reading it wrong, and that they are not the same thing?


All the documentation that I've found so far relates to finding the process that's using the most CPU (seems sensible), and diagnosing from there. But my highest is 0.79% spanning-treee.


Many thanks!

J

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
Joseph W. Doherty Thu, 06/11/2009 - 10:33
User Badges:
  • Super Bronze, 10000 points or more

The "missing" CPU is interrupt CPU. You won't see this under processes.

nate-miller Fri, 06/12/2009 - 19:16
User Badges:
  • Bronze, 100 points or more

79%/73%;


The first number is the total amount of CPU that's used, the second number is the amount of processor that's interrupt driven, and doesn't show up in the process list.


Search the site for troubleshooting high CPU due to interrupts.

Actions

This Discussion