How to get 'Memory size in use' during Multithreading

Question

Hi List,
I have written a class which extends Thread class with 3 threads running.Now, I have to keep track of the number of threads of request in progress, the memory size in use, some average
timing statistics of requests per second (if possible) or average processing time.
Can any 1 tell me...how i can do that?
I am new to Multithreading. So, a fast reply will highly appreciated.
Below is the coding...
Thanks in advance.
//class TestThread
public class TestThread extends Thread{     
     public TestThread(String str){
     super(str);      
     public void run(){
for (int i = 0; i < 10; i++) {
System.out.println(i + " " + getName());
try {
sleep(5000);
} catch (InterruptedException e) {}
System.out.println("DONE " + getName());
//class ThreadTest
public class ThreadTest{
     public static void main(String args[]){
          new TestThread("a1").start();
          new TestThread("b1").start();
          new TestThread("c1").start();
}

Answer 1

It's a Management and Monitoring issue.
Go study JMX and MXBeans...
If you can use JDK 5.0 (formerlly known as J2SDK 1.5.0), you can get some numbers like processing time by thread (available in a ready-made MXBean).
But "timing statistics" and "requests per second" you need to define them yourself, and add some variables and methods to your class (or to a MXBean) to measure them.