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Re: [Xen-API] Strange CPU utilization values of Dom0
- To: xen-api@xxxxxxxxxxxxxxxxxxx
- From: kushal waikar <kushalwaikar@xxxxxxxxxxx>
- Date: Sat, 21 Feb 2009 03:01:10 +0530 (IST)
- Delivery-date: Fri, 20 Feb 2009 13:31:22 -0800
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- List-id: Discussion of API issues surrounding Xen <xen-api.lists.xensource.com>
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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