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Question by Sy, D. · Sep 04, 2014 at 07:07 PM ·

Frequence of CPU usage

I would like to know to know exactly how the metric "CPU usage" is calculated in dynaTrace, particularly in the context of using processors with adjustable frequency depending for example on load and temperature - think of turbo boost, speed steps, etc..

Examples :

  • Proc Intel E7-4870 10 core, 2,4GHz, Turbo Boost à 2,8GHz
  • Prod Intel E7-4830 8 core, 2,13Ghz, Turbo Boost à 2,4Ghz

If i want to respect Microsoft's recommendation not to exceed 60% CPU load on their IIS web servers and are not currently able to because measures from dT and windows don't match in their load testing scenarios.

Can you please explain clearly how CPU frequency is calculated in dT ?

 

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Answer by Andreas G. · Sep 04, 2014 at 07:37 PM

Hi.

Measures in general are captured/calculated in a 10 second interval. For CPU or other Host/Process/Infrastructure measures we typically use OS APIs to query that data, or use Performance Counters from the OS (e.g: Windows Performance counters).

As for CPU Usage which is shown in the Host Health Dashboards - please have a look at Host Health Monitoring

Andi

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