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This patch adds a default shader warm up process which moves shader compilation from the animation time to the startup time. This also provides an extension for `runApp` so developers can customize the warm up process. This should reduce our worst_frame_rasterizer_time_millis from ~100ms to ~20-30ms for both flutter_gallery and complex_layout benchmarks. Besides, this should also have a significant improvement on 90th and 99th percentile time (50%-100% speedup in some cases, but I haven't tested them thoroughly; I'll let our device lab collect the data afterwards). The tradeoff the is the startup time (time to first frame). Our `flutter run --profile --trace-startup` seems to be a little noisy and I see about 100ms-200ms increase in that measurement for complex_layout and flutter_gallery. Note that this only happens on the first run after install or data wipe. Later the Skia persistent cache will remove the overhead. This also adds a cubic_bezier benchmark to test the custom shader warm up process. This should fix https://github.com/flutter/flutter/issues/813 (either by `defaultShaderWarmUp`, or a `customShaderWarmUp`). |
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Macrobenchmarks
Performance benchmarks using flutter drive.
Cull opacity benchmark
To run the cull opacity benchmark on a device:
flutter drive --profile test_driver/cull_opacity_perf.dart
Results should be in the file build/cull_opacity_perf.timeline_summary.json.
More detailed logs should be in build/cull_opacity_perf.timeline.json.