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POjava tcp program too slow(on the same computer)
 

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  1. POjava tcp program too slow(on the same computer)
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    <p>So basically I am running 2 java application on my computer ad then after i transmit data i calculate speed of transmition over java tcp and speed is always around 7 MegaBits/second i was expecting something atleast 56mbits/second anyway here is the client application :</p> <pre><code> import java.io.*; import java.net.*; class TCPClient { public static void main(String argv[]) throws Exception { System.out.println("Hello, World"); String modifiedSentence; BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in)); Socket clientSocket = new Socket("127.0.0.1", 7); BufferedInputStream inFromServer = new BufferedInputStream(clientSocket.getInputStream()); double count=0; OutputStream socketOutputStream = clientSocket.getOutputStream(); String s = "012345678901234567\n"; byte[] bytes = s.getBytes(); final int BUFFER_SIZE = 65536; byte[] buffer = new byte[BUFFER_SIZE]; // socketOutputStream.write(bytes); // inFromServer.read(buffer); // modifiedSentence = new String(buffer); // System.out.println("FROM SERVER:" + modifiedSentence); socketOutputStream.write(bytes); long times=System.nanoTime() ; long temp=times;long temp2=times; while (true) { socketOutputStream.write(bytes); count++; socketOutputStream.flush(); if(count&gt;=100000){ break; } } times=System.nanoTime() ; System.out.println("time(ns) : " + (times-temp2)); double speed=(72*2*count)/(double)((times-temp2)*Math.pow(10,-9)); System.out.println("speed : " + speed/(1024*1024)); clientSocket.close(); } } </code></pre> <p>and here is the server code :</p> <pre><code>import java.io.*; import java.net.*; class TCPClient extends Thread { Socket clientSocket; public TCPClient(Socket socket) { super("KKMultiServerThread"); this.clientSocket = socket; } public void run() //throws Exception { System.out.println("Hello, World"); try { String modifiedSentence; BufferedOutputStream outToServer = new BufferedOutputStream(clientSocket.getOutputStream()); BufferedInputStream inFromServer = new BufferedInputStream(clientSocket.getInputStream()); double count=0; String s = "012345678901234567\n"; byte[] bytes = s.getBytes(); long times=System.nanoTime() ; long temp=times;long temp2=times; final int BUFFER_SIZE = 19; byte[] buffer = new byte[BUFFER_SIZE]; modifiedSentence = ""; while ((inFromServer.read(buffer))!=-1) { // outToServer.write(bytes); // outToServer.flush(); } System.out.println("FROM SERVER:" + modifiedSentence); clientSocket.close(); } catch (UnknownHostException e) { System.err.println("Don't know about host: taranis."); System.exit(1); } catch (IOException e) { System.err.println("Couldn't get I/O for " + "the connection to: taranis."); System.exit(1); } } } </code></pre> <p>server code was adjusted not to write but only recieve and client to only send where through put is increased to 27Mbit/sec , but not 50Mbit/sec wich is half speed of ethernet , any help ?</p>
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    1. USOmar shaaban
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    1. COI would benchmark different buffer sizes - 64k seems awfully large.
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    2. COChanging buffer sizes didnt change throughput at all . weather increasing or decreasing it.
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      1. USOmar shaaban
 

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