----- Original Message -----
> From: "David Dimas" <[email protected]>
> To: [email protected]
> Sent: Friday, March 25, 2016 11:45:05 AM
> Subject: How to calculate Percentage CPU Usage
>
> Hello
> How are you?
> I am running curl command with your help successfully.
>
> Now I am going to calculate percentage CPU Usage. I have read this doc.
> [
> https://github.com/openshift/origin-metrics/blob/master/docs/hawkular_metrics.adoc#calcuating-percentage-cpu-usage
> ]
>
> In this guide, How can I get 'cpu/usage' and 'uptime'.
> I am running this command to get 'cpu/usage'.
>
> curl -k -H "Authorization: Bearer iCm-Mglj1TvBPd_VoJesqoqIAbVM2psZcXrykyshBU"
> -H "Hawkular-tenant: sample" -X GET
> https://hawkular-metrics.example.com/hawkular/metrics/counters/data?tags=descriptor_name:cpu/usage,pod_namespace:openshift-infra\&buckets=1\&start=`date
> -d -10minutes +%s%3N` | python -m json.tool
>
> Result is [{'min': 555115703.0, 'samples': 120, 'end': 1458837494033,
> 'median': 1391865412.971584, 'avg': 26785974599.89168, 'max':
> 144149182129.0, 'start': 1458836895027, 'empty': False}].
>
> so I think 'cpu/usage' is 'avg' value from this result. it this right?
The cpu/usage metric is a cumulative metric, which means that it always
increases unless the container has been restarted (at which point it resets
back to zero). For your example, the 'avg' value will give you the average over
the 10 minute window you specified. Since the value is cumulative and always
increasing (assuming no restarts, to find how much as used in that 10 minute
window, you would take the max value minus the min value
> After this, I calculated the percentage of a CPU core used with the following
> function.
> %core = 'cpu/usage' / ('uptime' * 1000000)
> I am getting 0.0005564113359207296 as core result. Is this right value?
Simplifying a bit taking the result from the example above (and assuming no
container restart)
'cpu/usage' as 'max' - 'min' = 143594066426 nanoseconds
cheating by taking 'uptime' as 'end' - 'start' milliseconds = 599006
milliseconds = 599006000000 nanoseconds
143594066426 nanoseconds / 599006000000 nanoseconds = 0.239720581 = 23.9720581%
So in the last 10 minutes, that container used 23.97% of a cpu core (assuming I
didn't make some simple calculation error above)
>
> Please give me a word of advice. I need your help.
> Best Regards
>
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