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diff --git a/benchmarks/ProtoBench.java b/benchmarks/ProtoBench.java
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+++ b/benchmarks/ProtoBench.java
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2009 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protocolbuffers;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.lang.reflect.Method;
+
+import com.google.protobuf.ByteString;
+import com.google.protobuf.CodedInputStream;
+import com.google.protobuf.CodedOutputStream;
+import com.google.protobuf.Message;
+
+public class ProtoBench {
+  
+  private static final long MIN_SAMPLE_TIME_MS = 2 * 1000;
+  private static final long TARGET_TIME_MS = 30 * 1000;
+
+  private ProtoBench() {
+    // Prevent instantiation
+  }
+  
+  public static void main(String[] args) {
+    if (args.length < 2 || (args.length % 2) != 0) {
+      System.err.println("Usage: ProtoBench <descriptor type name> <input data>");
+      System.err.println("The descriptor type name is the fully-qualified message name,");
+      System.err.println("e.g. com.google.protocolbuffers.benchmark.Message1");
+      System.err.println("(You can specify multiple pairs of descriptor type name and input data.)");
+      System.exit(1);
+    }
+    boolean success = true;
+    for (int i = 0; i < args.length; i += 2) {
+      success &= runTest(args[i], args[i + 1]);
+    }
+    System.exit(success ? 0 : 1);
+  }
+
+  /**
+   * Runs a single test. Error messages are displayed to stderr, and the return value
+   * indicates general success/failure.
+   */
+  public static boolean runTest(String type, String file) {
+    System.out.println("Benchmarking " + type + " with file " + file);
+    final Message defaultMessage;
+    try {
+      Class<?> clazz = Class.forName(type);
+      Method method = clazz.getDeclaredMethod("getDefaultInstance");
+      defaultMessage = (Message) method.invoke(null);
+    } catch (Exception e) {
+      // We want to do the same thing with all exceptions. Not generally nice,
+      // but this is slightly different.
+      System.err.println("Unable to get default message for " + type);
+      return false;
+    }
+    
+    try {
+      final byte[] inputData = readAllBytes(file);
+      final ByteArrayInputStream inputStream = new ByteArrayInputStream(inputData);
+      final ByteString inputString = ByteString.copyFrom(inputData);
+      final Message sampleMessage = defaultMessage.newBuilderForType().mergeFrom(inputString).build();
+      FileOutputStream devNullTemp = null;
+      CodedOutputStream reuseDevNullTemp = null;
+      try {
+        devNullTemp = new FileOutputStream("/dev/null");
+        reuseDevNullTemp = CodedOutputStream.newInstance(devNullTemp);
+      } catch (FileNotFoundException e) {
+        // ignore: this is probably Windows, where /dev/null does not exist
+      }
+      final FileOutputStream devNull = devNullTemp;
+      final CodedOutputStream reuseDevNull = reuseDevNullTemp;
+      benchmark("Serialize to byte string", inputData.length, new Action() {
+        public void execute() { sampleMessage.toByteString(); }
+      });      
+      benchmark("Serialize to byte array", inputData.length, new Action() {
+        public void execute() { sampleMessage.toByteArray(); }
+      });
+      benchmark("Serialize to memory stream", inputData.length, new Action() {
+        public void execute() throws IOException { 
+          sampleMessage.writeTo(new ByteArrayOutputStream()); 
+        }
+      });
+      if (devNull != null) {
+        benchmark("Serialize to /dev/null with FileOutputStream", inputData.length, new Action() {
+          public void execute() throws IOException {
+            sampleMessage.writeTo(devNull);
+          }
+        });
+        benchmark("Serialize to /dev/null reusing FileOutputStream", inputData.length, new Action() {
+          public void execute() throws IOException {
+            sampleMessage.writeTo(reuseDevNull);
+            reuseDevNull.flush();  // force the write to the OutputStream
+          }
+        });
+      }
+      benchmark("Deserialize from byte string", inputData.length, new Action() {
+        public void execute() throws IOException { 
+          defaultMessage.newBuilderForType().mergeFrom(inputString).build();
+        }
+      });
+      benchmark("Deserialize from byte array", inputData.length, new Action() {
+        public void execute() throws IOException { 
+          defaultMessage.newBuilderForType()
+            .mergeFrom(CodedInputStream.newInstance(inputData)).build();
+        }
+      });
+      benchmark("Deserialize from memory stream", inputData.length, new Action() {
+        public void execute() throws IOException { 
+          defaultMessage.newBuilderForType()
+            .mergeFrom(CodedInputStream.newInstance(inputStream)).build();
+          inputStream.reset();
+        }
+      });
+      System.out.println();
+      return true;
+    } catch (Exception e) {
+      System.err.println("Error: " + e.getMessage());
+      System.err.println("Detailed exception information:");
+      e.printStackTrace(System.err);
+      return false;
+    }
+  }
+  
+  private static void benchmark(String name, long dataSize, Action action) throws IOException {
+    // Make sure it's JITted "reasonably" hard before running the first progress test
+    for (int i=0; i < 100; i++) {
+      action.execute();
+    }
+    
+    // Run it progressively more times until we've got a reasonable sample
+    int iterations = 1;
+    long elapsed = timeAction(action, iterations);
+    while (elapsed < MIN_SAMPLE_TIME_MS) {
+      iterations *= 2;
+      elapsed = timeAction(action, iterations);
+    }
+    
+    // Upscale the sample to the target time. Do this in floating point arithmetic
+    // to avoid overflow issues.
+    iterations = (int) ((TARGET_TIME_MS / (double) elapsed) * iterations);
+    elapsed = timeAction(action, iterations);
+    System.out.println(name + ": " + iterations + " iterations in "
+         + (elapsed/1000f) + "s; " 
+         + (iterations * dataSize) / (elapsed * 1024 * 1024 / 1000f) 
+         + "MB/s");
+  }
+  
+  private static long timeAction(Action action, int iterations) throws IOException {
+    System.gc();    
+    long start = System.currentTimeMillis();
+    for (int i = 0; i < iterations; i++) {
+      action.execute();
+    }
+    long end = System.currentTimeMillis();
+    return end - start;
+  }
+  
+  private static byte[] readAllBytes(String filename) throws IOException {
+    RandomAccessFile file = new RandomAccessFile(new File(filename), "r");
+    byte[] content = new byte[(int) file.length()];
+    file.readFully(content);
+    return content;
+  }
+
+  /**
+   * Interface used to capture a single action to benchmark.
+   */
+  interface Action {
+    void execute() throws IOException;
+  }
+}