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a44f174efc
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`).
45 lines
1.4 KiB
Dart
45 lines
1.4 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:async';
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import 'package:flutter_driver/flutter_driver.dart';
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import 'package:test/test.dart' hide TypeMatcher, isInstanceOf;
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void macroPerfTest(
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String testName,
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String routeName,
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{Duration pageDelay, Duration duration = const Duration(seconds: 3)}) {
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test(testName, () async {
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final FlutterDriver driver = await FlutterDriver.connect();
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// The slight initial delay avoids starting the timing during a
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// period of increased load on the device. Without this delay, the
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// benchmark has greater noise.
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// See: https://github.com/flutter/flutter/issues/19434
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await Future<void>.delayed(const Duration(milliseconds: 250));
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await driver.forceGC();
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final SerializableFinder button = find.byValueKey(routeName);
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expect(button, isNotNull);
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await driver.tap(button);
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if (pageDelay != null) {
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// Wait for the page to load
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await Future<void>.delayed(pageDelay);
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}
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final Timeline timeline = await driver.traceAction(() async {
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await Future<void>.delayed(duration);
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});
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final TimelineSummary summary = TimelineSummary.summarize(timeline);
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summary.writeSummaryToFile(testName, pretty: true);
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summary.writeTimelineToFile(testName, pretty: true);
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driver.close();
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});
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}
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