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// 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 'dart:async';
import 'dart:math' as math;
import 'package:flutter/foundation.dart' show kDebugMode;
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:microbenchmarks/common.dart';
List<Object?> _makeTestBuffer(int size) {
final List<Object?> answer = <Object?>[];
for (int i = 0; i < size; ++i) {
switch (i % 9) {
case 0:
answer.add(1);
case 1:
answer.add(math.pow(2, 65));
case 2:
answer.add(1234.0);
case 3:
answer.add(null);
case 4:
answer.add(<int>[1234]);
case 5:
answer.add(<String, int>{'hello': 1234});
case 6:
answer.add('this is a test');
case 7:
answer.add(true);
case 8:
answer.add(Uint8List(64));
}
}
return answer;
}
Future<double> _runBasicStandardSmall(
BasicMessageChannel<Object?> basicStandard,
int count,
) async {
final Stopwatch watch = Stopwatch();
watch.start();
for (int i = 0; i < count; ++i) {
await basicStandard.send(1234);
}
watch.stop();
return watch.elapsedMicroseconds / count;
}
class _Counter {
int count = 0;
}
void _runBasicStandardParallelRecurse(
BasicMessageChannel<Object?> basicStandard,
_Counter counter,
int count,
Completer<int> completer,
Object? payload,
) {
counter.count += 1;
if (counter.count == count) {
completer.complete(counter.count);
} else if (counter.count < count) {
basicStandard.send(payload).then((Object? result) {
_runBasicStandardParallelRecurse(
basicStandard, counter, count, completer, payload);
});
}
}
Future<double> _runBasicStandardParallel(
BasicMessageChannel<Object?> basicStandard,
int count,
Object? payload,
int parallel,
) async {
final Stopwatch watch = Stopwatch();
final Completer<int> completer = Completer<int>();
final _Counter counter = _Counter();
watch.start();
for (int i = 0; i < parallel; ++i) {
basicStandard.send(payload).then((Object? result) {
_runBasicStandardParallelRecurse(
basicStandard, counter, count, completer, payload);
});
}
await completer.future;
watch.stop();
return watch.elapsedMicroseconds / count;
}
Future<double> _runBasicStandardLarge(
BasicMessageChannel<Object?> basicStandard,
List<Object?> largeBuffer,
int count,
) async {
int size = 0;
final Stopwatch watch = Stopwatch();
watch.start();
for (int i = 0; i < count; ++i) {
final List<Object?>? result =
await basicStandard.send(largeBuffer) as List<Object?>?;
// This check should be tiny compared to the actual channel send/receive.
size += (result == null) ? 0 : result.length;
}
watch.stop();
if (size != largeBuffer.length * count) {
throw Exception(
"There is an error with the echo channel, the results don't add up: $size",
);
}
return watch.elapsedMicroseconds / count;
}
Future<double> _runBasicBinary(
BasicMessageChannel<ByteData> basicBinary,
ByteData buffer,
int count,
) async {
int size = 0;
final Stopwatch watch = Stopwatch();
watch.start();
for (int i = 0; i < count; ++i) {
final ByteData? result = await basicBinary.send(buffer);
// This check should be tiny compared to the actual channel send/receive.
size += (result == null) ? 0 : result.lengthInBytes;
}
watch.stop();
if (size != buffer.lengthInBytes * count) {
throw Exception(
"There is an error with the echo channel, the results don't add up: $size",
);
}
return watch.elapsedMicroseconds / count;
}
Future<void> _runTest({
required Future<double> Function(int) test,
required BasicMessageChannel<Object?> resetChannel,
required BenchmarkResultPrinter printer,
required String description,
required String name,
required int numMessages,
}) async {
print('running $name');
resetChannel.send(true);
// Prime test.
await test(1);
printer.addResult(
description: description,
value: await test(numMessages),
unit: 'µs',
name: name,
);
}
Future<void> _runTests() async {
if (kDebugMode) {
throw Exception(
"Must be run in profile mode! Use 'flutter run --profile'.",
);
}
const BasicMessageChannel<Object?> resetChannel =
BasicMessageChannel<Object?>(
'dev.flutter.echo.reset',
StandardMessageCodec(),
);
const BasicMessageChannel<Object?> basicStandard =
BasicMessageChannel<Object?>(
'dev.flutter.echo.basic.standard',
StandardMessageCodec(),
);
const BasicMessageChannel<ByteData> basicBinary =
BasicMessageChannel<ByteData>(
'dev.flutter.echo.basic.binary',
BinaryCodec(),
);
/// WARNING: Don't change the following line of code, it will invalidate
/// `Large` tests. Instead make a different test. The size of largeBuffer
/// serialized is 14214 bytes.
final List<Object?> largeBuffer = _makeTestBuffer(1000);
final ByteData largeBufferBytes =
const StandardMessageCodec().encodeMessage(largeBuffer)!;
final ByteData oneMB = ByteData(1024 * 1024);
const int numMessages = 2500;
final BenchmarkResultPrinter printer = BenchmarkResultPrinter();
await _runTest(
test: (int x) => _runBasicStandardSmall(basicStandard, x),
resetChannel: resetChannel,
printer: printer,
description: 'BasicMessageChannel/StandardMessageCodec/Flutter->Host/Small',
name: 'platform_channel_basic_standard_2host_small',
numMessages: numMessages,
);
await _runTest(
test: (int x) => _runBasicStandardLarge(basicStandard, largeBuffer, x),
resetChannel: resetChannel,
printer: printer,
description: 'BasicMessageChannel/StandardMessageCodec/Flutter->Host/Large',
name: 'platform_channel_basic_standard_2host_large',
numMessages: numMessages,
);
await _runTest(
test: (int x) => _runBasicBinary(basicBinary, largeBufferBytes, x),
resetChannel: resetChannel,
printer: printer,
description: 'BasicMessageChannel/BinaryCodec/Flutter->Host/Large',
name: 'platform_channel_basic_binary_2host_large',
numMessages: numMessages,
);
await _runTest(
test: (int x) => _runBasicBinary(basicBinary, oneMB, x),
resetChannel: resetChannel,
printer: printer,
description: 'BasicMessageChannel/BinaryCodec/Flutter->Host/1MB',
name: 'platform_channel_basic_binary_2host_1MB',
numMessages: numMessages,
);
await _runTest(
test: (int x) => _runBasicStandardParallel(basicStandard, x, 1234, 3),
resetChannel: resetChannel,
printer: printer,
description:
'BasicMessageChannel/StandardMessageCodec/Flutter->Host/SmallParallel3',
name: 'platform_channel_basic_standard_2host_small_parallel_3',
numMessages: numMessages,
);
// Background platform channels aren't yet implemented for iOS.
const BasicMessageChannel<Object?> backgroundStandard =
BasicMessageChannel<Object?>(
'dev.flutter.echo.background.standard',
StandardMessageCodec(),
);
await _runTest(
test: (int x) => _runBasicStandardSmall(backgroundStandard, x),
resetChannel: resetChannel,
printer: printer,
description:
'BasicMessageChannel/StandardMessageCodec/Flutter->Host (background)/Small',
name: 'platform_channel_basic_standard_2hostbackground_small',
numMessages: numMessages,
);
await _runTest(
test: (int x) => _runBasicStandardParallel(backgroundStandard, x, 1234, 3),
resetChannel: resetChannel,
printer: printer,
description:
'BasicMessageChannel/StandardMessageCodec/Flutter->Host (background)/SmallParallel3',
name: 'platform_channel_basic_standard_2hostbackground_small_parallel_3',
numMessages: numMessages,
);
printer.printToStdout();
}
class _BenchmarkWidget extends StatefulWidget {
const _BenchmarkWidget(this.tests);
final Future<void> Function() tests;
@override
_BenchmarkWidgetState createState() => _BenchmarkWidgetState();
}
class _BenchmarkWidgetState extends State<_BenchmarkWidget> {
@override
void initState() {
widget.tests();
super.initState();
}
@override
Widget build(BuildContext context) => Container();
}
void main() {
runApp(const _BenchmarkWidget(_runTests));
}