Re: [PATCH 2/2] sched/fair: util_est: add running_sum tracking

Juri Lelli
2018-06-05T15:31:05Z

On 05/06/18 16:11, Patrick Bellasi wrote:

[...]

> If I run an experiment with your example above, while using the
> performance governor to rule out any possible scale invariance
> difference, here is what I measure:
>
> Task1 (40ms delayed by the following Task2):
> mean std max
> running_avg 455.387449 22.940168 492.0
> util_avg 433.233288 17.395477 458.0
>
> Task2 (waking up at same time of Task1 and running before):
> mean std max
> running_avg 430.281834 22.405175 455.0
> util_avg 421.745331 22.098873 456.0
>
> and if I compare Task1 above with another experiment where Task1 is
> running alone:
>
> Task1 (running alone):
> mean std min
> running_avg 460.257895 22.103704 460.0
> util_avg 435.119737 17.647556 461.0

Wait, why again in this last case running_avg != util_avg? :)