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diff --git a/benchmarks/HashedCollectionsBenchmark.java b/benchmarks/HashedCollectionsBenchmark.java
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+/*
+ * Copyright (C) 2010 Google Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package benchmarks;
+
+import com.google.caliper.Param;
+import com.google.caliper.Runner;
+import com.google.caliper.SimpleBenchmark;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.HashMap;
+import java.util.Hashtable;
+import java.util.LinkedHashMap;
+
+/**
+ * How do the various hash maps compare?
+ */
+public class HashedCollectionsBenchmark extends SimpleBenchmark {
+    public void timeHashMapGet(int reps) {
+        HashMap<String, String> map = new HashMap<String, String>();
+        map.put("hello", "world");
+        for (int i = 0; i < reps; ++i) {
+            map.get("hello");
+        }
+    }
+    public void timeHashMapGet_Synchronized(int reps) {
+        HashMap<String, String> map = new HashMap<String, String>();
+        synchronized (map) {
+            map.put("hello", "world");
+        }
+        for (int i = 0; i < reps; ++i) {
+            synchronized (map) {
+                map.get("hello");
+            }
+        }
+    }
+    public void timeHashtableGet(int reps) {
+        Hashtable<String, String> map = new Hashtable<String, String>();
+        map.put("hello", "world");
+        for (int i = 0; i < reps; ++i) {
+            map.get("hello");
+        }
+    }
+    public void timeLinkedHashMapGet(int reps) {
+        LinkedHashMap<String, String> map = new LinkedHashMap<String, String>();
+        map.put("hello", "world");
+        for (int i = 0; i < reps; ++i) {
+            map.get("hello");
+        }
+    }
+    public void timeConcurrentHashMapGet(int reps) {
+        ConcurrentHashMap<String, String> map = new ConcurrentHashMap<String, String>();
+        map.put("hello", "world");
+        for (int i = 0; i < reps; ++i) {
+            map.get("hello");
+        }
+    }
+}