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edits (eval)

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carlnues@buffalo.edu 2023-08-25 21:42:48 -04:00
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sections/evaluation.tex
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@ -129,7 +129,8 @@ In summary: \systemname, with a considerably simpler policy mechanism, offers e
To attribute the improvement in performance, we measure the CPU frequencies selected by \schedutil and \systemname, respectively.
\Cref{fig:time_per_freq_fb,fig:time_per_freq_yt,fig:time_per_freq_spot} plot a CDF of the difference between these two selections.
We note that for a significant fraction of the workload (5\% for Facebook, 15\% for Youtube), the frequency selected by \schedutil is significantly (up to 50\%) lower.
This addresses claim (iv) from above:
We note that for a significant fraction of the workload (5\% for Facebook, 15\% for Youtube, 12\% for Spotify), the frequency selected by \schedutil is significantly (up to 50\%) lower.
This is \schedutil's ramp-up period, where it selects frequencies lower than $\fenergy$.
We attribute the improved performance for both governors to eliminating the ramp-up period where \systemname selects speeds below $\fenergy$.
Although each workload spends part of its time at a higher frequency in \schedutil compared to \systemname, it spends more time ramping up to $\fenergy$ than at a higher speed.
@ -172,8 +173,6 @@ In common settings, background load does not pose a threat to the performance of
We next review our findings from \Cref{sec:adaptiveApps}, that typical apps increase their offered load as CPU capacity increases.
\Cref{fig:nonidle_fb,fig:nonidle_yt,fig:nonidle_spot} illustrate the fraction of the of time the CPU spends doing work in each workload as CPU frequency increases.
Recall that, assuming the amount of work stays constant in a fixed-duration workload, the time spent non-idle would show an inverse-linear relationship with the CPU frequency.
As with Facebook, the Youtube workload shows a much flatter relationship, particularly on the big cores.
\todo{Discuss Spotify}
As with Facebook, both Youtube and Spotify shows a much flatter relationship, particularly on the big cores.