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POJava I/O vs NIO: Quick Benchmark Comparison
 

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    <p>I recently read that in newer computers Java's I/O performs better than NIO because of the new availability of multi-core machines.</p> <p>I ran a quick test comparing the transfer time of I/O and NIO over the LAN using the localhost loopback address.</p> <p>Note: This is using JDK 7</p> <p>The results (3 trials):</p> <p>I/O transfers averaged <strong>21789.3ms</strong></p> <p>NIO transfers averaged <strong>22771.0ms</strong></p> <p>It is also worth noting that CPU usage appeared to be around 10% higher on each NIO transfer as compared to the I/O.</p> <p>My question for you is if my comparison code is fair? Did I write good/equal I/O and NIO code? If not, how can I improve and re-run this test?</p> <pre><code> public static void main(String[] args) { System.out.println("Initiating test sequence..."); new Thread(new Client()).start(); try { System.out.println("Server I/O initiating..."); ServerSocket server = new ServerSocket(5555); Socket sock = server.accept(); System.out.println("Server connected to client successfully"); InputStream is = sock.getInputStream(); File output = new File("C:/test_root/video.avi"); FileOutputStream fos = new FileOutputStream(output); byte[] data = new byte[1024]; int len=0; System.out.println("Server initiating transfer - Timer starting"); long start = System.currentTimeMillis(); while((len=is.read(data))&gt;0) { fos.write(data, 0, len); fos.flush(); } fos.close(); is.close(); sock.close(); server.close(); long end = System.currentTimeMillis(); System.out.println("Network I/O transfer time = "+(end-start)+"ms"); System.out.println("Server NIO initiating..."); ServerSocketChannel serverChan = ServerSocketChannel.open(); serverChan.bind(new InetSocketAddress(5555)); SocketChannel chan = serverChan.accept(); chan.configureBlocking(false); System.out.println("Server channel connected"); FileChannel fc = (FileChannel) Files.newByteChannel(Paths.get("C:/test_root/video.avi"), StandardOpenOption.CREATE, StandardOpenOption.WRITE); ByteBuffer buff = ByteBuffer.allocate(1024); System.out.println("Server initiating transfer - Timer starting"); start = System.currentTimeMillis(); while(chan.read(buff)&gt;=0 || buff.position() &gt; 0) { buff.flip(); fc.write(buff); buff.compact(); } chan.close(); fc.close(); serverChan.close(); end = System.currentTimeMillis(); System.out.println("Network NIO transfer time = "+(end-start)+"ms"); } catch (IOException e) { e.printStackTrace(); } System.out.println("Test completed!"); } static class Client implements Runnable { public void run() { try { System.out.println("Client I/O initiating..."); Socket sock = new Socket("localhost", 5555); System.out.println("Client connected to server successfully!"); OutputStream os = sock.getOutputStream(); File input = new File(System.getProperty("user.home")+"/Documents/clip0025.avi"); FileInputStream fis = new FileInputStream(input); byte[] data = new byte[1024]; int len=0; int tot=0; int perc=0; while((len=fis.read(data))&gt;0) { os.write(data, 0, len); os.flush(); tot+=len; int prev = perc; perc = getPercentage(tot, input.length()); if(perc !=prev &amp;&amp; (perc == 10 || perc == 25 || perc == 50 || perc == 75 || perc == 98)) System.out.println("Client reporting: "+perc+"% read"); } os.close(); fis.close(); sock.close(); try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("Client NIO initiating..."); SocketChannel sc = SocketChannel.open(); boolean connected = sc.connect(new InetSocketAddress("localhost",5555)); if(!connected) connected = sc.finishConnect(); if(!connected) throw(new IOException("Client failed to connect")); System.out.println("Client channel connected"); sc.configureBlocking(false); FileChannel fc = (FileChannel) Files.newByteChannel(input.toPath(), StandardOpenOption.READ); ByteBuffer buff = ByteBuffer.allocate(1024); len=0; tot=0; while((len=fc.read(buff))&gt;=0||buff.position()&gt;0) { buff.flip(); sc.write(buff); buff.compact(); tot+=len; int prev = perc; perc = getPercentage(tot, input.length()); if(perc !=prev &amp;&amp; (perc == 10 || perc == 25 || perc == 50 || perc == 75 || perc == 98)) System.out.println("Client reporting: "+perc+"% read"); } sc.close(); fc.close(); } catch (IOException e) { e.printStackTrace(); } } } </code></pre> <p>Additional Info:</p> <p>Windows Vista (SP2) on Dell Studio XPS 435MT</p> <p>1st gen i7 quad-core processor 2.67GHz</p> <p>6GB RAM</p> <p>64-bit architecture</p>
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    1. COI am not convinced that the benchmarking part of this is fair -- in Java, you really do need to do things like warm up the JVM and all. You might be able to use a benchmarking tool like http://code.google.com/p/caliper/ .
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    2. CO@LouisWasserman How would you suggest warming up the JVM and/or improving this code?
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    3. COUse a benchmarking framework built by people who know what they're doing wrt the JVM, essentially. Don't write your own "timing an operation" code. There are many more ways to get it wrong than there are to get it right.
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