Use trackCacheDependencies for performance speedup

lib/src/analyzer/context.dart

 // Copyright (c) 2015, 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:args/args.dart' show ArgParser, ArgResults;
 import 'package:analyzer/src/context/context.dart' show AnalysisContextImpl;
 import 'package:analyzer/src/generated/engine.dart'
     show AnalysisContext, AnalysisEngine, AnalysisOptionsImpl;
 import 'package:analyzer/src/generated/java_io.dart' show JavaFile;
@@ skipping 124 matching lines @@
     context.typeProvider = sdkResolver.dartSdk.context.typeProvider;
     context.resultProvider =
         new InputPackagesResultProvider(context, summaryData);
   }
   return context;
 }
 
 /// Creates an analysis context that contains our restricted typing rules.
 AnalysisContextImpl createAnalysisContext() {
   var res = AnalysisEngine.instance.createAnalysisContext();
-  res.analysisOptions = new AnalysisOptionsImpl()..strongMode = true;
+  res.analysisOptions = new AnalysisOptionsImpl()
+    ..strongMode = true
+    ..trackCacheDependencies = false;
   return res;
 }
 
 /// Creates a SourceFactory configured by the [options].
 ///
 /// Use [options.useMockSdk] to specify the SDK mode, or use [sdkResolver]
 /// to entirely override the DartUriResolver.
 ///
 /// If supplied, [fileResolvers] will override the default `file:` and
 /// `package:` URI resolvers.
@@ skipping 25 matching lines @@
 }
 
 /// Creates a [DartUriResolver] that uses a mock 'dart:' library contents.
 DartUriResolver createMockSdkResolver(Map<String, String> mockSources) =>
     new MockDartSdk(mockSources, reportMissing: true).resolver;
 
 DirectoryBasedDartSdk _createDirectoryBasedDartSdk(String sdkPath) {
   var sdk = new DirectoryBasedDartSdk(
       new JavaFile(sdkPath), /*useDart2jsPaths:*/ true);
   sdk.useSummary = true;
-  sdk.analysisOptions = new AnalysisOptionsImpl()..strongMode = true;
+  sdk.analysisOptions = new AnalysisOptionsImpl()
+    ..strongMode = true
+    ..trackCacheDependencies = false;

[Jennifer Messerly, 2016/06/13 18:21:11]

Not sure if this matters for SDK context?

[scheglov, 2016/06/13 18:23:28]

SDK context results are served from summary, and we don't set dependencies for
them anyway.

   return sdk;
 }
 
 /// Creates a [DartUriResolver] that uses the SDK at the given [sdkPath].
 DartUriResolver createSdkPathResolver(String sdkSummaryPath, String sdkPath) {
   var sdk = (sdkSummaryPath != null)
       ? new SummaryBasedDartSdk(sdkSummaryPath, true)
       : _createDirectoryBasedDartSdk(sdkPath);
   return new DartUriResolver(sdk);
 }