使用带有套接字的Javas对象流的性能问题

Question

我正在尝试使用Java中的套接字和对象流来进行本地IPC但是我看到性能不佳.

我正在测试通过ObjectOutputStream发送对象的ping时间,以通过Socket上的ObjectInputStream接收回复.

这是请求者:

public SocketTest(){

    int iterations = 100;
    try {
        Socket socket = new Socket("localhost", 1212);

        ObjectInputStream objectInputStream = new ObjectInputStream(socket.getInputStream()); 
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(socket.getOutputStream()); 

        double start = System.currentTimeMillis();
        for (int i = 0; i < iterations; ++i) {

            Request request = new Request();
            objectOutputStream.writeObject(request);

            Response response = (Response)objectInputStream.readObject();
        }
        double finish = System.currentTimeMillis();
        System.out.println("Per ping: " + (finish - start) / iterations );

    } catch (Exception e) {
        e.printStackTrace();
    }
}

这是响应者:

public ServerSocketTest(){

    try {

        ServerSocket serverSocket = new ServerSocket(1212);
        Socket socket = serverSocket.accept();

        ObjectOutputStream objectOutputStream = new ObjectOutputStream(socket.getOutputStream());
        ObjectInputStream objectInputStream = new ObjectInputStream(socket.getInputStream());

        Request request = (Request)objectInputStream.readObject();
        while (request != null) {

            Response response = new Response();
            objectOutputStream.writeObject(response);
            request = (Request)objectInputStream.readObject();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

我得到的结果是:

Per ping:80.35

对于本地交通来说,80毫秒的速度非常慢.

请求和响应类非常小,序列化很快.

我试过天真添加:

socket.setKeepAlive(true);  
socket.setTcpNoDelay(true);

影响不大.

执行ping localhost:

64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=0 ttl=64 time=0.035 ms  
64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=1 ttl=64 time=0.037 ms  
64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=2 ttl=64 time=0.049 ms  
64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=3 ttl=64 time=0.039 ms  
64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=4 ttl=64 time=0.056 ms  

也快.

Java版本1.6.0_05l在RedHat 2.4上运行

Answer 1

您是否尝试在BufferedInputStream/BufferedOutputStream中嵌入请求ts和响应？它应该广泛改善表现.