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Added standard deviation to rasterizer results. (#131781)

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This calculation is important if you want to calculate the probability that one thing is better than another.
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gaaclarke 2023-08-02 09:40:07 -07:00 committed by GitHub
parent 4b176a716c
commit 947367aaa2
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3 changed files with 21 additions and 0 deletions
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1
dev/devicelab/lib/tasks/gallery.dart
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@ -189,6 +189,7 @@ class GalleryTransitionTest {
'90th_percentile_frame_build_time_millis',
'99th_percentile_frame_build_time_millis',
'average_frame_rasterizer_time_millis',
'stddev_frame_rasterizer_time_millis',
'worst_frame_rasterizer_time_millis',
'90th_percentile_frame_rasterizer_time_millis',
'99th_percentile_frame_rasterizer_time_millis',

18
packages/flutter_driver/lib/src/driver/timeline_summary.dart
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@ -82,6 +82,20 @@ class TimelineSummary {
return _averageInMillis(_extractGpuRasterizerDrawDurations());
}
/// Standard deviation amount of time spent per frame in the engine rasterizer.
///
/// Throws a [StateError] if this summary contains no timeline events.
double computeStandardDeviationFrameRasterizerTimeMillis() {
final List<Duration> durations = _extractGpuRasterizerDrawDurations();
final double average = _averageInMillis(durations);
double tally = 0.0;
for (final Duration duration in durations) {
final double time = duration.inMicroseconds.toDouble() / 1000.0;
tally += (average - time).abs();
}
return tally / durations.length;
}
/// The longest frame rasterization time in milliseconds.
///
/// Throws a [StateError] if this summary contains no timeline events.
@ -146,6 +160,9 @@ class TimelineSummary {
/// * "average_frame_rasterizer_time_millis": Average amount of time spent
/// per frame in the engine rasterizer.
/// See [computeAverageFrameRasterizerTimeMillis].
/// * "stddev_frame_rasterizer_time_millis": Standard deviation of the amount
/// of time spent per frame in the engine rasterizer.
/// See [computeStandardDeviationFrameRasterizerTimeMillis].
/// * "90th_percentile_frame_rasterizer_time_millis" and
/// "99th_percentile_frame_rasterizer_time_millis": The 90/99-th percentile
/// frame rasterization time in milliseconds.
@ -240,6 +257,7 @@ class TimelineSummary {
'worst_frame_build_time_millis': computeWorstFrameBuildTimeMillis(),
'missed_frame_build_budget_count': computeMissedFrameBuildBudgetCount(),
'average_frame_rasterizer_time_millis': computeAverageFrameRasterizerTimeMillis(),
'stddev_frame_rasterizer_time_millis': computeStandardDeviationFrameRasterizerTimeMillis(),
'90th_percentile_frame_rasterizer_time_millis': computePercentileFrameRasterizerTimeMillis(90.0),
'99th_percentile_frame_rasterizer_time_millis': computePercentileFrameRasterizerTimeMillis(99.0),
'worst_frame_rasterizer_time_millis': computeWorstFrameRasterizerTimeMillis(),

2
packages/flutter_driver/test/src/real_tests/timeline_summary_test.dart
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@ -463,6 +463,7 @@ void main() {
'worst_frame_build_time_millis': 19.0,
'missed_frame_build_budget_count': 2,
'average_frame_rasterizer_time_millis': 16.0,
'stddev_frame_rasterizer_time_millis': 4.0,
'90th_percentile_frame_rasterizer_time_millis': 20.0,
'99th_percentile_frame_rasterizer_time_millis': 20.0,
'worst_frame_rasterizer_time_millis': 20.0,
@ -578,6 +579,7 @@ void main() {
'99th_percentile_frame_build_time_millis': 19.0,
'missed_frame_build_budget_count': 2,
'average_frame_rasterizer_time_millis': 16.0,
'stddev_frame_rasterizer_time_millis': 4.0,
'90th_percentile_frame_rasterizer_time_millis': 20.0,
'99th_percentile_frame_rasterizer_time_millis': 20.0,
'worst_frame_rasterizer_time_millis': 20.0,