Tool for local SDK search index benchmark (#8751)

Author: isoos

app/bin/tools/sdk_search_benchmark.dart

@@ -0,0 +1,28 @@
+// 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:pub_dev/search/flutter_sdk_mem_index.dart';
+
+/// Loads a Dart SDK search snapshot and executes queries on it, benchmarking their total time to complete.
+Future<void> main() async {
+  final index = await createFlutterSdkMemIndex();
+
+  // NOTE: please add more queries to this list, especially if there is a performance bottleneck.
+  final queries = [
+    'chart',
+    'json',
+    'camera',
+    'android camera',
+    'sql database',
+  ];
+
+  final sw = Stopwatch()..start();
+  var count = 0;
+  for (var i = 0; i < 100; i++) {
+    index!.search(queries[i % queries.length]);
+    count++;
+  }
+  sw.stop();
+  print('${(sw.elapsedMilliseconds / count).toStringAsFixed(2)} ms/request');
+}