flutter/dev/benchmarks/microbenchmarks/lib/stocks/build_bench.dart
Ian Hickson 073843f2ca Make these microbenchmarks more holistic. (#8070)
They previously were very sensitive to widgets like LayoutBuilder.
2017-02-10 15:06:18 -08:00

62 lines
2.2 KiB
Dart

// Copyright 2016 The Chromium 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 'dart:async';
import 'dart:ui' as ui;
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:stocks/main.dart' as stocks;
import 'package:stocks/stock_data.dart' as stock_data;
import '../common.dart';
const Duration kBenchmarkTime = const Duration(seconds: 15);
Future<Null> main() async {
assert(false); // don't run this in checked mode! Use --release.
stock_data.StockDataFetcher.actuallyFetchData = false;
// This allows us to call onBeginFrame even when the engine didn't request it,
// and have it actually do something:
LiveTestWidgetsFlutterBinding binding = TestWidgetsFlutterBinding.ensureInitialized();
binding.allowAllFrames = true;
final Stopwatch watch = new Stopwatch();
int iterations = 0;
await benchmarkWidgets((WidgetTester tester) async {
stocks.main();
await tester.pump(); // Start startup animation
await tester.pump(const Duration(seconds: 1)); // Complete startup animation
await tester.tapAt(new Point(20.0, 40.0)); // Open drawer
await tester.pump(); // Start drawer animation
await tester.pump(const Duration(seconds: 1)); // Complete drawer animation
final BuildableElement appState = tester.element(find.byType(stocks.StocksApp));
watch.start();
while (watch.elapsed < kBenchmarkTime) {
appState.markNeedsBuild();
// We don't use tester.pump() because we're trying to drive it in an
// artificially high load to find out how much CPU each frame takes.
// This differs from normal benchmarks which might look at how many
// frames are missed, etc.
ui.window.onBeginFrame(new Duration(milliseconds: iterations * 16));
iterations += 1;
}
watch.stop();
});
BenchmarkResultPrinter printer = new BenchmarkResultPrinter();
printer.addResult(
description: 'Stock build',
value: watch.elapsedMicroseconds / iterations,
unit: 'µs per iteration',
name: 'stock_build_iteration',
);
printer.printToStdout();
}