Re: An old Question about Multi Processing of Applets?

From:

Knute Johnson <nospam@rabbitbrush.frazmtn.com>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 26 Feb 2008 14:57:26 -0800

Message-ID:

<47c461db$0$5812$b9f67a60@news.newsdemon.com>

Sanny wrote:

I asked this question earlier but do not get a proper answer to it.

I want to know If I assign 10 threads in an Applet and run it on a 8-
core CPU will the threads in the Applet run in Parallel???

Some said Browers window will get Only 1 CPU.

Some said depends on Browser

Some said Threads will get seperate Processors.

So I wanted to know the answer and I got all the three answers. Here
are the Browsers I am Concerned with.

1. Internet Explorer
2. Netscape
3. FireFox.
4. Any other important Browser.

Since 90% people use any of the above browsers.

I know An Application run on 8 core processor then all threads will
get seperate Processor, But I want to know What happens when an Applet
is running on a Browser.

Bye
Sanny

I ran a test with the following code on Windows XP with a Pentium D
processor with both FireFox and IE7. In both cases both processors were
used. Of course this is not conclusive and it probably depends on the
JVM and available resources. But at least you know under this
circumstance that multiple processors were used in a browser.

import java.applet.*;
import java.awt.*;

public class PTestApplet extends Applet implements Runnable {
     volatile boolean flag = true;
     volatile Thread one,two;

     public void init() {
         one = new Thread(this);
         two = new Thread(this);
     }

     public void start() {
         one.start();
         two.start();

         Runnable r = new Runnable() {
             public void run() {
                 try {
                     Thread.sleep(10000);
                 } catch (InterruptedException ie) { }
                 flag = false;
             }
         };
         new Thread(r).start();
     }

     public void run() {
         while (flag) {
             for (int i=0; i<100000; i++) ;
         }
     }

     public void stop() {
         flag = false;
     }
}

--

Knute Johnson
email s/nospam/knute/

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