Quick and dirty benchmark.

Sample output:

OkHttp [gzip, chunked, HTTP_11]
bodyByteCount=1048576 headerCount=20 threadCount=10
Requests per second: 121.0
Requests per second: 304.6
Requests per second: 379.1
Requests per second: 386.9
Requests per second: 369.2
Requests per second: 390.8
Requests per second: 368.8
Requests per second: 325.2
Requests per second: 409.4
Requests per second: 389.1

benchmarks/pom.xml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>com.squareup.okhttp</groupId>
+    <artifactId>parent</artifactId>
+    <version>2.0.0-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>benchmarks</artifactId>
+  <name>Benchmarks</name>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.squareup.okhttp</groupId>
+      <artifactId>okhttp</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>com.squareup.okhttp</groupId>
+      <artifactId>mockwebserver</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>org.bouncycastle</groupId>
+      <artifactId>bcprov-jdk15on</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.mortbay.jetty.npn</groupId>
+      <artifactId>npn-boot</artifactId>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+</project>

benchmarks/src/main/java/com/squareup/okhttp/benchmarks/Benchmark.java

@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2014 Square, 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 com.squareup.okhttp.benchmarks;
+
+import com.squareup.okhttp.OkHttpClient;
+import com.squareup.okhttp.Protocol;
+import com.squareup.okhttp.internal.SslContextBuilder;
+import com.squareup.okhttp.mockwebserver.Dispatcher;
+import com.squareup.okhttp.mockwebserver.MockResponse;
+import com.squareup.okhttp.mockwebserver.MockWebServer;
+import com.squareup.okhttp.mockwebserver.RecordedRequest;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Random;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import java.util.zip.GZIPOutputStream;
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSession;
+import javax.net.ssl.SSLSocketFactory;
+
+/**
+ * This benchmark is fake, but may be useful for certain relative comparisons.
+ * It uses a local connection to a MockWebServer to measure how many identical
+ * requests per second can be carried over a fixed number of threads.
+ */
+public class Benchmark {
+  private static final int NUM_REPORTS = 10;
+  private final Random random = new Random(0);
+
+  /** Which client to run.*/
+  // TODO: implement additional candidates for other HTTP client libraries.
+  Candidate candidate = new OkHttp();
+
+  /** How many concurrent threads to execute. */
+  int threadCount = 10;
+
+  /** True to use TLS. */
+  // TODO: compare different ciphers?
+  boolean tls = false;
+
+  /** True to use gzip content-encoding for the response body. */
+  boolean gzip = true;
+
+  /** Don't combine chunked with SPDY_3 or HTTP_2; that's not allowed. */
+  boolean chunked = true;
+
+  /** The size of the HTTP response body, in uncompressed bytes. */
+  int bodyByteCount = 1024 * 1024;
+
+  /** How many additional headers were included, beyond the built-in ones. */
+  int headerCount = 20;
+
+  /** Which ALPN/NPN protocols are in use. Only useful with TLS. */
+  List<Protocol> protocols = Arrays.asList(Protocol.HTTP_11);
+
+  public static void main(String[] args) throws IOException {
+    new Benchmark().run();
+  }
+
+  public void run() throws IOException {
+    ThreadPoolExecutor executor = new ThreadPoolExecutor(threadCount, threadCount,
+        1, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>());
+
+    System.out.println(toString());
+
+    // Prepare the client & server
+    candidate.prepare();
+    MockWebServer server = startServer();
+    String url = server.getUrl("/").toString();
+
+    int targetBacklog = 10;
+    int requestCount = 0;
+    long reportStart = System.nanoTime();
+    long reportPeriod = TimeUnit.SECONDS.toNanos(1);
+    int reports = 0;
+
+    // Run until we've printed enough reports.
+    while (reports < NUM_REPORTS) {
+      // Print a report if we haven't recently.
+      long now = System.nanoTime();
+      double reportDuration = now - reportStart;
+      if (reportDuration > reportPeriod) {
+        double requestsPerSecond = requestCount / reportDuration * TimeUnit.SECONDS.toNanos(1);
+        System.out.println(String.format("Requests per second: %.1f", requestsPerSecond));
+        requestCount = 0;
+        reportStart = now;
+        reports++;
+      }
+
+      // Fill the job queue with work.
+      while (executor.getQueue().size() < targetBacklog) {
+        executor.execute(candidate.request(url));
+        requestCount++;
+      }
+
+      // The job queue is full. Take a break.
+      sleep(10);
+    }
+  }
+
+  @Override public String toString() {
+    List<Object> modifiers = new ArrayList<Object>();
+    if (tls) modifiers.add("tls");
+    if (gzip) modifiers.add("gzip");
+    if (chunked) modifiers.add("chunked");
+    modifiers.addAll(protocols);
+
+    return String.format("%s %s\n"
+        + "bodyByteCount=%s headerCount=%s threadCount=%s",
+        candidate.getClass().getSimpleName(), modifiers,
+        bodyByteCount, headerCount, threadCount);
+  }
+
+  private void sleep(int millis) {
+    try {
+      Thread.sleep(millis);
+    } catch (InterruptedException ignored) {
+    }
+  }
+
+  private MockWebServer startServer() throws IOException {
+    Logger.getLogger(MockWebServer.class.getName()).setLevel(Level.WARNING);
+    MockWebServer server = new MockWebServer();
+
+    if (tls) {
+      SSLContext sslContext = SslContextBuilder.localhost();
+      server.useHttps(sslContext.getSocketFactory(), false);
+      server.setNpnEnabled(true);
+    }
+
+    final MockResponse response = newResponse();
+    server.setDispatcher(new Dispatcher() {
+      @Override public MockResponse dispatch(RecordedRequest request) {
+        return response;
+      }
+    });
+
+    server.play();
+    return server;
+  }
+
+  private MockResponse newResponse() throws IOException {
+    byte[] body = new byte[bodyByteCount];
+    random.nextBytes(body);
+
+    MockResponse result = new MockResponse();
+
+    if (gzip) {
+      body = gzip(body);
+      result.addHeader("Content-Encoding: gzip");
+    }
+
+    if (chunked) {
+      result.setChunkedBody(body, 1024);
+    } else {
+      result.setBody(body);
+    }
+
+    for (int i = 0; i < headerCount; i++) {
+      result.addHeader(randomString(12), randomString(20));
+    }
+
+    return result;
+  }
+
+  private String randomString(int length) {
+    String alphabet = "-abcdefghijklmnopqrstuvwxyz";
+    char[] result = new char[length];
+    for (int i = 0; i < length; i++) {
+      result[i] = alphabet.charAt(random.nextInt(alphabet.length()));
+    }
+    return new String(result);
+  }
+
+  /** Returns a gzipped copy of {@code bytes}. */
+  private byte[] gzip(byte[] bytes) throws IOException {
+    ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
+    OutputStream gzippedOut = new GZIPOutputStream(bytesOut);
+    gzippedOut.write(bytes);
+    gzippedOut.close();
+    return bytesOut.toByteArray();
+  }
+
+  interface Candidate {
+    void prepare();
+    Runnable request(String url);
+  }
+
+  class OkHttp implements Candidate {
+    private OkHttpClient client;
+
+    @Override public void prepare() {
+      client = new OkHttpClient();
+      client.setProtocols(protocols);
+
+      URL.setURLStreamHandlerFactory(client);
+
+      if (tls) {
+        SSLContext sslContext = SslContextBuilder.localhost();
+        SSLSocketFactory socketFactory = sslContext.getSocketFactory();
+        HostnameVerifier hostnameVerifier = new HostnameVerifier() {
+          @Override public boolean verify(String s, SSLSession session) {
+            return true;
+          }
+        };
+        client.setSslSocketFactory(socketFactory);
+        client.setHostnameVerifier(hostnameVerifier);
+      }
+    }
+
+    @Override public Runnable request(String url) {
+      return new HttpURLConnectionRequest(url);
+    }
+  }
+}

benchmarks/src/main/java/com/squareup/okhttp/benchmarks/HttpURLConnectionRequest.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2014 Square, 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 com.squareup.okhttp.benchmarks;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.concurrent.TimeUnit;
+
+public class HttpURLConnectionRequest implements Runnable {
+  private static final boolean VERBOSE = false;
+  private final URL url;
+
+  public HttpURLConnectionRequest(String url) {
+    try {
+      this.url = new URL(url);
+    } catch (MalformedURLException e) {
+      throw new AssertionError();
+    }
+  }
+
+  public void run() {
+    byte[] buffer = new byte[1024];
+    long start = System.nanoTime();
+    try {
+      HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
+      InputStream in = urlConnection.getInputStream();
+
+      // Discard the response body.
+      int total = 0;
+      for (int count; (count = in.read(buffer)) != -1; ) {
+        total += count;
+      }
+      in.close();
+      long finish = System.nanoTime();
+
+      if (VERBOSE) {
+        System.out.println(String.format("Transferred % 8d bytes in %4d ms",
+            total, TimeUnit.NANOSECONDS.toMillis(finish - start)));
+      }
+    } catch (IOException e) {
+      System.out.println("Failed: " + e);
+    }
+  }
+}

mockwebserver/src/main/java/com/squareup/okhttp/mockwebserver/MockWebServer.java

@@ -18,10 +18,10 @@
 package com.squareup.okhttp.mockwebserver;
 
 import com.squareup.okhttp.Protocol;
-import com.squareup.okhttp.internal.bytes.ByteString;
 import com.squareup.okhttp.internal.NamedRunnable;
 import com.squareup.okhttp.internal.Platform;
 import com.squareup.okhttp.internal.Util;
+import com.squareup.okhttp.internal.bytes.ByteString;
 import com.squareup.okhttp.internal.spdy.Header;
 import com.squareup.okhttp.internal.spdy.IncomingStreamHandler;
 import com.squareup.okhttp.internal.spdy.SpdyConnection;
@@ -72,7 +72,6 @@
  * replays them upon request in sequence.
  */
 public final class MockWebServer {
-
   private static final X509TrustManager UNTRUSTED_TRUST_MANAGER = new X509TrustManager() {
     @Override public void checkClientTrusted(X509Certificate[] chain, String authType)
         throws CertificateException {
@@ -381,7 +380,9 @@ private boolean processOneRequest(Socket socket, InputStream in, OutputStream ou
         } else if (response.getSocketPolicy() == SocketPolicy.SHUTDOWN_OUTPUT_AT_END) {
           socket.shutdownOutput();
         }
-        logger.info("Received request: " + request + " and responded: " + response);
+        if (logger.isLoggable(Level.INFO)) {
+          logger.info("Received request: " + request + " and responded: " + response);
+        }
         sequenceNumber++;
         return true;
       }
@@ -611,8 +612,10 @@ private SpdySocketHandler(Socket socket, Protocol protocol) {
         throw new AssertionError(e);
       }
       writeResponse(stream, response);
-      logger.info("Received request: " + request + " and responded: " + response
-          + " protocol is " + protocol.name.utf8());
+      if (logger.isLoggable(Level.INFO)) {
+        logger.info("Received request: " + request + " and responded: " + response
+            + " protocol is " + protocol.name.utf8());
+      }
     }
 
     private RecordedRequest readRequest(SpdyStream stream) throws IOException {

pom.xml

@@ -24,6 +24,7 @@
     <module>okhttp-protocols</module>
     <module>mockwebserver</module>
     <module>samples</module>
+    <module>benchmarks</module>
   </modules>
 
   <properties>