| // Copyright (c) 2024, 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 'package:analysis_server/src/services/completion/dart/completion_manager.dart'; |
| import 'package:analysis_server/src/services/completion/dart/suggestion_builder.dart'; |
| import 'package:analyzer/dart/analysis/results.dart'; |
| import 'package:analyzer/file_system/overlay_file_system.dart'; |
| import 'package:analyzer/file_system/physical_file_system.dart'; |
| import 'package:analyzer/src/dart/analysis/analysis_context_collection.dart'; |
| import 'package:analyzer/src/util/performance/operation_performance.dart'; |
| |
| import 'sliding_statistics.dart'; |
| |
| /// A tool to see the current performance of code completion at an interesting |
| /// location. To see details, run it with `--observe:5000` and then use |
| /// DevTools CPU profiler. |
| /// |
| /// Currently this is not a tool to track performance, it does not record it |
| /// anywhere. |
| /// |
| /// Update the marked code as necessary to construct a case for checking |
| /// performance. The code below is just one example that we saw to have |
| /// significant cost. |
| /// |
| /// Don't forget to update [flutterPackagePath]. |
| Future<void> main() async { |
| await _runForever( |
| path: '$flutterPackagePath/lib/test.dart', |
| markedCode: r''' |
| import 'package:flutter/widgets.dart'; |
| Widget x = ^; |
| ''', |
| ); |
| } |
| |
| const String flutterEnvironmentPath = |
| '/Users/scheglov/dart/flutter_elements/environment'; |
| |
| /// This should be the path of the `package:flutter` in a local checkout. |
| /// You don't have to use [flutterEnvironmentPath] from above. |
| const String flutterPackagePath = '$flutterEnvironmentPath/packages/flutter'; |
| |
| Future<void> _runForever({ |
| required String path, |
| required String markedCode, |
| }) async { |
| var offset = markedCode.indexOf('^'); |
| if (offset == -1) { |
| throw ArgumentError('No ^ marker'); |
| } |
| |
| var rawCode = |
| markedCode.substring(0, offset) + markedCode.substring(offset + 1); |
| if (rawCode.contains('^')) { |
| throw ArgumentError('Duplicate ^ marker'); |
| } |
| |
| var resourceProvider = OverlayResourceProvider( |
| PhysicalResourceProvider.INSTANCE, |
| ); |
| |
| resourceProvider.setOverlay( |
| path, |
| content: rawCode, |
| modificationStamp: -1, |
| ); |
| |
| var collection = AnalysisContextCollectionImpl( |
| resourceProvider: resourceProvider, |
| includedPaths: [path], |
| sdkPath: '/Users/scheglov/Applications/dart-sdk', |
| ); |
| var analysisContext = collection.contextFor(path); |
| var analysisSession = analysisContext.currentSession; |
| var unitResult = await analysisSession.getResolvedUnit(path); |
| unitResult as ResolvedUnitResult; |
| |
| var dartRequest = DartCompletionRequest.forResolvedUnit( |
| resolvedUnit: unitResult, |
| offset: offset, |
| ); |
| |
| var statistics = SlidingStatistics(100); |
| while (true) { |
| var timer = Stopwatch()..start(); |
| var budget = CompletionBudget(Duration(seconds: 30)); |
| List<CompletionSuggestionBuilder> suggestions = []; |
| for (var i = 0; i < 10; i++) { |
| suggestions = await DartCompletionManager( |
| budget: budget, |
| notImportedSuggestions: NotImportedSuggestions(), |
| ).computeSuggestions( |
| dartRequest, |
| OperationPerformanceImpl('<root>'), |
| maxSuggestions: -1, |
| useFilter: false, |
| ); |
| } |
| |
| var responseTime = timer.elapsedMilliseconds; |
| statistics.add(responseTime); |
| if (statistics.isReady) { |
| print( |
| '[${DateTime.now().millisecondsSinceEpoch}]' |
| '[time: $responseTime ms][mean: ${statistics.mean.toStringAsFixed(1)}]' |
| '[stdDev: ${statistics.standardDeviation.toStringAsFixed(3)}]' |
| '[min: ${statistics.min.toStringAsFixed(1)}]' |
| '[max: ${statistics.max.toStringAsFixed(1)}]', |
| ); |
| } else { |
| print('[time: $responseTime ms][suggestions: ${suggestions.length}]'); |
| } |
| } |
| } |