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    <p>So here are some details about the solution I used.</p> <p>Starting from this trivial program (HelloWorld.java) which took about 100ms to execute:</p> <pre><code>class HelloWorld { public static void main(String[] args) { System.out.println("Hello, world!"); } } $ javac HelloWorld.java $ time java HelloWorld Hello, world! real 0m0.109s user 0m0.030s sys 0m0.030s </code></pre> <p>I converted it into a trivial server:</p> <pre><code>import java.io.*; import java.net.*; class HelloWorldThread extends Thread { private Socket socket; public HelloWorldThread(Socket s) { super("HelloWorldThread"); socket = s; } public void run() { try { PrintWriter out = new PrintWriter(socket.getOutputStream(), true); out.println("Hello, world!"); out.close(); socket.close(); } catch (IOException e) { e.printStackTrace(); } } } class HelloWorld { public static void main(String[] args) { try { ServerSocket serverSocket = new ServerSocket(30281); while (true) new HelloWorldThread(serverSocket.accept()).start(); } catch (IOException e) { e.printStackTrace(); } } } </code></pre> <p>start it once and use <a href="http://en.wikipedia.org/wiki/Netcat" rel="nofollow noreferrer">netcat</a> to connect to it (thanks <a href="https://stackoverflow.com/users/114226/petermmm">PeterMmm</a> for the idea) which resulted in the execution time of just 3ms:</p> <pre><code>$ javac HelloWorld.java $ java HelloWorld &amp; $ time nc localhost 30281 Hello, world! real 0m0.003s user 0m0.000s sys 0m0.000s </code></pre>
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