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

[kushal waikar <kushalwaikar@xxxxxxxxxxx>]

Would u please elaborate this with help of example...? I haven't understood what did u exactly mean to say...


--- On Sat, 21/2/09, Stefan de Konink <stefan@xxxxxxxxx> wrote:

From: Stefan de Konink <stefan@xxxxxxxxx>
Subject: Re: [Xen-API] Strange CPU utilization values of Dom0
To: "kushal waikar" <kushalwaikar@xxxxxxxxxxx>
Cc: xen-api@xxxxxxxxxxxxxxxxxxx
Date: Saturday, 21 February, 2009, 1:28 AM

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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