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RUG201110141

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06-18-2007
08:42 AM

1 Solution

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conyards

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06-19-2007
11:21 PM

The sample rate, is the frequency with which VC or ESXtop will check to see what CPU resource is being utilised. Hence the need to reference the sample rate when calculating CPU %ready time.

hence,

5% of 20sec is = 1 sec or 1000 ms

10% of 5sec is = 0.5sec or 500ms

1000 ms of ready time as reported by VC would be reported as 20% %ready time within ESXtop.

Hopefully this is a little clearer.

Simon

https://virtual-simon.co.uk/

7 Replies

hicksj

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06-18-2007
10:32 AM

I remember discussing this with some folks a while back...

Took a few minutes to find it... in the archives:

http://www.vmware.com/community/message.jspa?messageID=462180#462180

RUG201110141

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06-18-2007
10:26 PM

conyards

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06-19-2007
03:24 AM

5% CPU correlates to 1000ms (or 1 second) because the default sample rate within virtual centre is every 20 seconds.

5% of 20 is 1 second, therefore 1000ms.

As for the difference within ESXTOP and VC I can only speculate that you are looking at different samples.

How is the performance inside the server itself.

Simon

https://virtual-simon.co.uk/

hicksj

Virtuoso

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06-19-2007
06:13 AM

RUG201110141

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06-19-2007
08:20 AM

conyards

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06-19-2007
11:21 PM

The sample rate, is the frequency with which VC or ESXtop will check to see what CPU resource is being utilised. Hence the need to reference the sample rate when calculating CPU %ready time.

hence,

5% of 20sec is = 1 sec or 1000 ms

10% of 5sec is = 0.5sec or 500ms

1000 ms of ready time as reported by VC would be reported as 20% %ready time within ESXtop.

Hopefully this is a little clearer.

Simon

https://virtual-simon.co.uk/

jamesl73

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06-29-2007
01:03 PM

I still don't understand why you even need to consider the sampling time. Aren't the samples just a single point in time at the given interval? So whether you take the sample every 5 seconds or every 20 seconds the data means the same and shouldn't require different calculations.

If the samples were a sum of last 5 or 20 seconds then your calculations would make sense to me.