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Reland "Add a microbenchmark for text intrinsic height layout (#145007)" (#145037)

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Add the missing `Directionality` widget and `await test.pump()` call: commit: 0fd7712fa7

Without the `pump` 1s, it sometimes schedules multiple `handleBeginFrame`s and `handleDrawFrame`s.
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LongCatIsLooong 2024-03-12 17:52:24 -07:00 committed by GitHub
parent 2fde3ac38b
commit 8270872f86
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2 changed files with 68 additions and 0 deletions
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67
dev/benchmarks/microbenchmarks/lib/layout/text_intrinsic_bench.dart Normal file
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@ -0,0 +1,67 @@
// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
import '../common.dart';
const Duration kBenchmarkTime = Duration(seconds: 15);
// Use an Align to loosen the constraints.
final Widget intrinsicTextHeight = Directionality(
textDirection: TextDirection.ltr,
child: Align(
child: IntrinsicHeight(
child: Text('A' * 100),
),
),
);
Future<void> main() async {
assert(false, "Don't run benchmarks in debug mode! Use 'flutter run --release'.");
// We control the framePolicy below to prevent us from scheduling frames in
// the engine, so that the engine does not interfere with our timings.
final LiveTestWidgetsFlutterBinding binding = TestWidgetsFlutterBinding.ensureInitialized() as LiveTestWidgetsFlutterBinding;
final Stopwatch watch = Stopwatch();
int iterations = 0;
await benchmarkWidgets((WidgetTester tester) async {
runApp(intrinsicTextHeight);
// Wait for the UI to stabilize.
await tester.pump(const Duration(seconds: 1));
final TestViewConfiguration big = TestViewConfiguration.fromView(
size: const Size(360.0, 640.0),
view: tester.view,
);
final TestViewConfiguration small = TestViewConfiguration.fromView(
size: const Size(100.0, 640.0),
view: tester.view,
);
final RenderView renderView = WidgetsBinding.instance.renderViews.single;
binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.benchmark;
watch.start();
while (watch.elapsed < kBenchmarkTime) {
renderView.configuration = iterations.isEven ? big : small;
await tester.pumpBenchmark(Duration(milliseconds: iterations * 16));
iterations += 1;
}
watch.stop();
});
final BenchmarkResultPrinter printer = BenchmarkResultPrinter();
printer.addResult(
description: 'Text intrinsic height',
value: watch.elapsedMicroseconds / iterations,
unit: 'µs per iteration',
name: 'text_intrinsic_height_iteration',
);
printer.printToStdout();
}

1
dev/devicelab/lib/tasks/microbenchmarks.dart
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@ -74,6 +74,7 @@ TaskFunction createMicrobenchmarkTask({
...await runMicrobench('lib/stocks/build_bench.dart'),
...await runMicrobench('lib/stocks/layout_bench.dart'),
...await runMicrobench('lib/ui/image_bench.dart'),
...await runMicrobench('lib/layout/text_intrinsic_bench.dart'),
};
return TaskResult.success(allResults,