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Generate a Gallery demo transition-durations performance histogram (#3859)

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This commit is contained in:
Hans Muller 2016-05-11 14:52:34 -07:00
parent 2aab6b565c
commit 2e8315e8f5
1 changed files with 47 additions and 7 deletions
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54
examples/flutter_gallery/test_driver/transitions_perf_test.dart
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@ -3,8 +3,12 @@
// found in the LICENSE file.
import 'dart:async';
import 'dart:convert' show JsonEncoder;
import 'package:file/file.dart';
import 'package:file/io.dart';
import 'package:flutter_driver/flutter_driver.dart';
import 'package:path/path.dart' as path;
import 'package:test/test.dart';
// Warning: the following strings must be kept in sync with GalleryHome.
@ -46,6 +50,41 @@ const List<String> demoNames = const <String>[
'Typography'
];
Future<Null> saveDurationsHistogram(List<Map<String, dynamic>> events) async {
final Map<String, List<int>> durations = new Map<String, List<int>>();
Map<String, dynamic> startEvent;
// Save the duration of the first frame after each 'Start Transition' event.
for (Map<String, dynamic> event in events) {
final String eventName = event['name'];
if (eventName == 'Start Transition') {
assert(startEvent == null);
startEvent = event;
} else if (startEvent != null && eventName == 'Frame') {
final String routeName = startEvent['args']['to'];
durations[routeName] ??= new List<int>();
durations[routeName].add(event['dur']);
startEvent = null;
}
}
// Verify that the durations data is valid.
if (durations.keys.isEmpty)
throw 'no "Start Transition" timeline events found';
for(String routeName in durations.keys) {
if (durations[routeName] == null || durations[routeName].length != 2)
throw 'invalid timeline data for $routeName transition';
}
// Save the durations Map to a file.
final String destinationDirectory = 'build';
final FileSystem fs = new LocalFileSystem();
await fs.directory(destinationDirectory).create(recursive: true);
final File file = fs.file(path.join(destinationDirectory, 'transition_durations.timeline.json'));
await file.writeAsString(new JsonEncoder.withIndent(' ').convert(durations));
}
void main() {
group('flutter gallery transitions', () {
FlutterDriver driver;
@ -81,13 +120,14 @@ void main() {
}
},
streams: const <TimelineStream>[
TimelineStream.dart,
TimelineStream.gc,
TimelineStream.compiler
TimelineStream.dart
]);
new TimelineSummary.summarize(timeline)
..writeSummaryToFile('transitions_perf', pretty: true)
..writeTimelineToFile('transitions_perf', pretty: true);
}, timeout: new Timeout(new Duration(minutes: 15)));
// Save the duration (in microseconds) of the first timeline Frame event
// that follows a 'Start Transition' event. The Gallery app adds a
// 'Start Transition' event when a demo is launched (see GalleryItem).
saveDurationsHistogram(timeline.json['traceEvents']);
}, timeout: new Timeout(new Duration(minutes: 5)));
});
}