Victor Stinner vstinner at redhat.com
Wed Jul 11 04:42:10 EDT 2018

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2018-07-11 9:19 GMT+02:00 Andrea Griffini <agriff at tin.it>:
> May be is something obvious but I find myself forgetting often about
> the fact that most modern CPUs can change speed (and energy consumption)
> depending on a moving average of CPU load.
>
> If you don't disable this "green" feature and the benchmarks are quick then
> the
> result can have huge variations depending on exactly when and if the CPU
> switches to fast mode.

If you use "sudo python3 -m perf system tune": Turbo Boost is disabled
and the CPU frequency is fixed.

More into at:
http://perf.readthedocs.io/en/latest/system.html

Victor

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