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Reading CPU, Memory and Thread utilization in java

Posted on 2004-08-25
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Last Modified: 2010-05-19
hi,
i need to read cpu utilization,memory utilization and threads of java application. I need to read this information through java programming. can anyone help me out?
Thanks in advance
Mahesh
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Question by:MMaheshwaran
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by:
TrekkyLeaper earned 64 total points
ID: 11891410
If you're using UNIX, you can try parsing the results of a ps command. Otherwise, I think you will have to use some native code to do this.
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by:Giant2
Giant2 earned 62 total points
ID: 11891448
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by:girionis
girionis earned 62 total points
ID: 11891450
You can only find info about the memory that is allocated to the JVM by the OS.
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Author Comment

by:MMaheshwaran
ID: 11891903
i need it in windows 2000. i have explored some of the java profiling agent. It makes use of JVMPI to read resource utilization(  JFluid Netbeans plugin ). is it possible to use JVMPI to read this information?

mahesh
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Expert Comment

by:girionis
ID: 11892001
I am not sure. But for any memory or process utilization you want to do *outside* the JVM you will need to use native code.
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by:Giant2
ID: 11899904
See the link I posted before!
I believe it could be interesting for you.
(I point at a code in JNI doing what you want).
http://www.codeguru.com/Cpp/misc/misc/assemblylanguage/article.php/c3847/

Bye, Giant.
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Assisted Solution

by:brosouille
brosouille earned 62 total points
ID: 11901713
-Memory
Use java.lang.Runtime

-Thread
In a file thread.jsp

<pre>
<%
            ThreadGroup tg = Thread.currentThread().getThreadGroup();
            while (tg.getParent() != null) {
                  tg = tg.getParent();            
            }
      
            Thread threads[] = new Thread[5000];
            tg.enumerate(threads,true);

            for(int i = 0 ; i < threads.length ;i++) {

                  Thread t = threads[i];
                  if (null != t) {
                        String name = t.getName();
                        int pri = t.getPriority();
                        String group = t.getThreadGroup().getName();
                        out.println("thread '" +name+"' of ["+group+"] ; prior "+pri+" alive="+t.isAlive()+" interrupted="+t.isInterrupted()+" daemon="+t.isDaemon());
                  }
            }

%>

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Expert Comment

by:Giant2
ID: 12256364
I think a split or a delete.
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by:girionis
ID: 12256649
I think the question is already answered so a split woudl be nice :)
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