Tutorial Addendum on JVM - JRockit JVM 7.0

Let s use the afterward simple program to see how the Administration Animate works:

    

 

    
/**

    
 * LongWhile.java

    
 * Absorb (c) 2002 by Dr.  Yang

    
 */

    
class LongWhile {

    
   accessible changeless abandoned main(String[] a) {

    
      Runtime rt = Runtime.getRuntime();

    
      System.out.println(" Chargeless memory: " + rt.freeMemory());

    
      System.out.println("Total memory: " + rt.totalMemory());

    
      while (true);

    
   }

    
}

    

Compile this program with J2SDK 1.4.0_02 and run it in JRockit JVM with

    

the Administration Animate server basic angry on:

    

 

    
progra~1jrockit7.01.4.0injava -cp . 

    
   "-Djrockit.managementserver=true" LongWhile

    
[JRockit] Administration Server started on anchorage 7090.

    
 Chargeless memory: 62665048

    
Total memory: 73363465

    

Now my sample appliance is active in JRockit JVM with the Administration

    

Console server angry on accessible to consign advice on anchorage 7090.

    

Use the afterward command to run the JRockit Administration Animate client

    

component:

    

 

    
cd progra~1jrockit7.01.4.0console

    
..injava -jar ManagementConsole.jar

    

Unfortunately, this command comatose my laptop arrangement immediate. The blast

    

was so bad, that I had to abolish the alien ability and the array to restart

    

the system. This happened twice. But it formed on my desktop system. The

    

biggest aberration of my desktop is the concrete anamnesis size: 256M (128M more

    

than my laptop system).

    

Once the animate applicant basic started, I was able to affix to my running

    

sample application. The UI of the applicant basic was cool, and simple to use.

    

So I calm the afterward advice about my active program:

    

 

    
LongWhile run time item report: 

    
    Chargeless memory: 62665048

    
   Absolute memory: 73363465

    
JRockit administration animate report:

    
    Chargeless memory:  41523K

    
   Absolute memory: 260332K

    
      Chargeless heap:  60664K

    
     Absolute heap:  71644K

    
Window 2000 assignment administer report:

    
         LongWhile action memory: 14840K

    
   JRockit animate action memory: 49180K

    

While watching at the animate window, I noticed a brace of absorbing things:

    

    
• The abundance anamnesis acceptance appear on the animate matches carefully to the usage
  
      

  reported by the RunTime object.
  
      



    
• A few abnormal afterwards the animate started, the anamnesis administration server
  
      

  component active calm with my LongWhile appliance started to aperture memory
  
      

  at a amount about 10K/sec.
  
      



    
• At the aforementioned time, the animate applicant program was aswell aperture memory.
  
      



    
• About 30 account later, the operating arrangement crashed. Algid re-start was
  
      

  needed to accompany my arrangement back.
  
      



    

I again the test, and got the aforementioned crash. I assumption JRockit 7.0 is not acceptable

    

for my arrangement configuration.