Re: [Xen-API] Strange CPU utilization values of Dom0

[Stefan de Konink <stefan@xxxxxxxxx>]

kushal waikar wrote:
> Hi,
>     I am trying to fetch CPU utilization of Dom0 using XenAPI & 
> Python...I am not getting any error in my code...But Whatever CPU 
> utilization I am getting from my Dom0 is having value less than one... 
> But actual CPU utilization seen under Virtual Machine Manager is in 
> range of 1 to 100...It never exceeds 100 since it is percentage... If I 
> multiply the values getting here by 100 then sometimes my CPU 
> utilization is exceeding above 100, which is impossible practically 
> (remember it is %age thts it should be <=100)...
>  My questions are-->
>
> 1. What kind of manipulation should be carried out on the vales 
> obtained  through  my code to get the correct CPU utilization of Dom0....? 
>
> 2. Any other way to get correct values ?

The CPU utilalisation is time spend in the dom / total time between 
sample interval.
So if you measure every 5 seconds your calculation would be:

this sample - previous sample
-----------------------------
          5 * 1000


Stefan

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