RUMM-2687 Invert frame time to get js refresh rate #1105
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mariusc83
requested changes
Oct 25, 2022
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| private fun VitalInfo.toInversePerformanceMetric(): ViewEvent.FlutterBuildTime { | ||
| return ViewEvent.FlutterBuildTime( | ||
| min = invertValue(maxValue), |
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why are you switching min with max here ?
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Maybe a comment to explain that would be nice here. It will be very hard to remember why we are doing this.
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I'll add a comment indeed.
If we take the inverse of numbers, min and max are reversed.
For instance if min = 4 and max = 10, then for the inverse min = 1/max = 0.1 and max = 1/min = 0.25
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I got that...what is hard for me to understand is that right now we are inverting the max value to create the min. But is this relevant ?
Codecov Report
@@ Coverage Diff @@
## develop #1105 +/- ##
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- Coverage 83.29% 83.25% -0.03%
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Files 273 273
Lines 9363 9368 +5
Branches 1503 1504 +1
===========================================
+ Hits 7798 7799 +1
- Misses 1147 1149 +2
- Partials 418 420 +2
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What does this PR do?
Let the RN SDK report the frame time, then invert it when reporting to backend to report frame rate.
Motivation
Get a more sensible for the average js refresh rate by getting the harmonic mean instead of the arithmetic mean.
See https://gamedev.net/forums/topic/628085-math-fail-adding-frames-per-second/4960225/ and https://en.wikipedia.org/wiki/Harmonic_mean#Average_speed to understand why this makes more sense.
Additional Notes
Anything else we should know when reviewing?
Review checklist (to be filled by reviewers)