Re: CPU Profiling with (j)visualvm

"John B. Matthews" <nospam@nospam.invalid>
Sun, 20 Feb 2011 10:52:59 -0500
In article
 Marc van Dongen <> wrote:

On Feb 19, 6:38??am, Marc van Dongen <> wrote:
Below I'm attaching the commands which I carried out so as to profile
the java application. The java application may be downloaded from
I've also uploaded two screen captures of the visualvm session:
<> and

I'm nonplussed. Running your example, I see no Logger invocations at all.

Using java.util.Timer as you did, I get the results below. In
particular, I see une, deux and trois invoked in the prescribed ratio
with reasonable self-times. I get comparable results with Ubuntu Linux.


package news;

import java.util.*;

public final class DebugMe {

    private static Timer timer = createTimer();
    private static volatile int counter;

    public static void main(String[] args) {
        while (true) {

    private static Timer createTimer() {
        timer = new Timer();
        TimerTask task = new TimerTask() {

            public void run() {
                deux(); deux();
                trois(); trois(); trois();

            public void une() { counter++; }
            public void deux() { counter++; }
            private void trois() { counter++; }
        timer.schedule(task, 1000L, 1000L);
        return timer;

$ jvisualvm &
[1] 54722
$ java -cp build/classes news.DebugMe
Profiler Agent: JNI On Load Initializing...
Profiler Agent: JNI OnLoad Initialized successfully
Profiler Agent: Waiting for connection on port 5140 (Protocol version: 9)
Profiler Agent: Established local connection with the tool
^CProfiler Agent: Connection with agent closed
Profiler Agent: Connection with agent closed

John B. Matthews
trashgod at gmail dot com

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