Redo our benchmarks; add a benchmark/benchmarks.dart tool.

pkg/analysis_server/benchmark/benchmarks.dart

Index: pkg/analysis_server/benchmark/benchmarks.dart
diff --git a/pkg/analysis_server/benchmark/benchmarks.dart b/pkg/analysis_server/benchmark/benchmarks.dart
new file mode 100644
index 0000000000000000000000000000000000000000..aed89bbe452f1fe853c145b69d44c0672af4cbe5
--- /dev/null
+++ b/pkg/analysis_server/benchmark/benchmarks.dart
@@ -0,0 +1,229 @@
+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. 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:convert';
+import 'dart:io';
+import 'dart:math' as math;
+
+import 'package:analyzer/file_system/file_system.dart';
+import 'package:analyzer/file_system/physical_file_system.dart';
+import 'package:args/command_runner.dart';
+import 'package:intl/intl.dart';
+import 'package:path/path.dart' as path;
+
+import 'perf/benchmarks_impl.dart';
+
+Future main(List<String> args) async {
+  final List<Benchmark> benchmarks = [
+    new ColdAnalysisBenchmark(),
+    new AnalysisBenchmark(),
+  ];
+
+  CommandRunner runner = new CommandRunner(
+      'benchmark', 'A benchmark runner for the analysis server.');
+  runner.addCommand(new ListCommand(benchmarks));
+  runner.addCommand(new RunCommand(benchmarks));
+  runner.run(args);
+}
+
+class ListCommand extends Command {
+  final List<Benchmark> benchmarks;
+
+  ListCommand(this.benchmarks) {
+    argParser.addFlag('machine',
+        negatable: false, help: 'Emit the list of benchmarks as json.');
+  }
+
+  @override
+  String get name => 'list';
+
+  @override
+  String get description => 'List available benchmarks.';
+
+  @override
+  String get invocation => '${runner.executableName} $name';
+
+  void run() {
+    if (argResults['machine']) {
+      final Map map = {
+        'benchmarks': benchmarks.map((b) => b.toJson()).toList()
+      };
+      print(new JsonEncoder.withIndent('  ').convert(map));
+    } else {
+      for (Benchmark benchmark in benchmarks) {
+        print('${benchmark.id}: ${benchmark.description}');
+      }
+    }
+  }
+}
+
+class RunCommand extends Command {
+  final List<Benchmark> benchmarks;
+
+  RunCommand(this.benchmarks) {
+    argParser.addFlag('quick',
+        negatable: false,
+        help: 'Run a quick version of the benchmark. This is '
+            'not useful for gathering accurate times, but can be used to '
+            'validate that the benchmark works.');
+    argParser.addOption('repeat',
+        defaultsTo: '10', help: 'The number of times to repeat the benchmark.');
+  }
+
+  @override
+  String get name => 'run';
+
+  @override
+  String get description => 'Run a given benchmark.';
+
+  @override
+  String get invocation => '${runner.executableName} $name <benchmark-id>';
+
+  Future run() async {
+    if (argResults.rest.isEmpty) {
+      printUsage();
+      exit(1);
+    }
+
+    final String benchmarkId = argResults.rest.first;
+    final int repeatCount = int.parse(argResults['repeat']);
+    final bool quick = argResults['quick'];
+
+    final Benchmark benchmark =
+        benchmarks.firstWhere((b) => b.id == benchmarkId, orElse: () {
+      print("Benchmark '$benchmarkId' not found.");
+      exit(1);
+    });
+
+    int actualIterations = repeatCount;
+    if (benchmark.maxIterations > 0) {
+      actualIterations = math.min(benchmark.maxIterations, repeatCount);
+    }
+
+    try {
+      BenchMarkResult result;
+      Stopwatch time = new Stopwatch()..start();
+      print('Running $benchmarkId $actualIterations times...');
+
+      for (int iteration = 0; iteration < actualIterations; iteration++) {
+        BenchMarkResult newResult = await benchmark.run(quick: quick);
+        print('  $newResult');
+        result = result == null ? newResult : result.combine(newResult);
+      }
+
+      time.stop();
+      print('Finished in ${time.elapsed.inSeconds} seconds.\n');
+      Map m = {
+        'benchmark': benchmarkId,
+        'result': result.toJson(),
+      };
+      print(JSON.encode(m));
+    } catch (error, st) {
+      print('$benchmarkId threw exception: $error');
+      print(st);
+      exit(1);
+    }
+  }
+}
+
+abstract class Benchmark {
+  final String id;
+  final String description;
+  final bool enabled;
+
+  /// One of 'memory' or 'cpu'.
+  final String kind;
+
+  Benchmark(this.id, this.description, {this.enabled: true, this.kind: 'cpu'});
+
+  Future<BenchMarkResult> run({bool quick: false});
+
+  int get maxIterations => 0;
+
+  Map toJson() =>
+      {'id': id, 'description': description, 'enabled': enabled, 'kind': kind};
+
+  String toString() => '$id: $description';
+}
+
+class BenchMarkResult {
+  static final NumberFormat nf = new NumberFormat.decimalPattern();
+
+  /// One of 'bytes', 'micros', or 'compound'.
+  final String kindName;
+
+  final int value;
+
+  BenchMarkResult(this.kindName, this.value);
+
+  BenchMarkResult combine(BenchMarkResult other) {
+    return new BenchMarkResult(kindName, math.min(value, other.value));
+  }
+
+  Map toJson() => {kindName: value};
+
+  String toString() => '$kindName: ${nf.format(value)}';
+}
+
+class CompoundBenchMarkResult extends BenchMarkResult {
+  final String name;
+
+  CompoundBenchMarkResult(this.name) : super('compound', 0);
+
+  Map<String, BenchMarkResult> results = {};
+
+  void add(String name, BenchMarkResult result) {
+    results[name] = result;
+  }
+
+  BenchMarkResult combine(BenchMarkResult other) {
+    BenchMarkResult _combine(BenchMarkResult a, BenchMarkResult b) {
+      if (a == null) return b;
+      if (b == null) return a;
+      return a.combine(b);
+    }
+
+    CompoundBenchMarkResult o = other as CompoundBenchMarkResult;
+
+    CompoundBenchMarkResult combined = new CompoundBenchMarkResult(name);
+    List<String> keys =
+        (new Set()..addAll(results.keys)..addAll(o.results.keys)).toList();
+
+    for (String key in keys) {
+      combined.add(key, _combine(results[key], o.results[key]));
+    }
+
+    return combined;
+  }
+
+  Map toJson() {
+    Map m = {};
+    for (String key in results.keys) {
+      m['$name-$key'] = results[key].toJson();
+    }
+    return m;
+  }
+
+  String toString() => '${toJson()}';
+}
+
+List<String> getProjectRoots({bool quick: false}) {
+  String script = Platform.script.toFilePath(windows: Platform.isWindows);
+  String pkgPath = path.normalize(path.join(path.dirname(script), '..', '..'));
+  return <String>[path.join(pkgPath, quick ? 'meta' : 'analysis_server')];
+}
+
+String get analysisServerSrcPath {
+  String script = Platform.script.toFilePath(windows: Platform.isWindows);
+  String pkgPath = path.normalize(path.join(path.dirname(script), '..', '..'));
+  return path.join(pkgPath, 'analysis_server');
+}
+
+void deleteServerCache() {
+  // ~/.dartServer/.analysis-driver/
+  ResourceProvider resourceProvider = PhysicalResourceProvider.INSTANCE;
+  Folder stateLocation = resourceProvider.getStateLocation('.analysis-driver');
+  stateLocation.delete();
+}