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Java-Gaming.org > Game Development > Performance Tuning > 100% CPU Usage!!!!!!!
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Offline Javaisthefuture

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*

Posts: 18
« on: 2007-11-28 16:50:41 »
Hi,
When I start my program the CPU Usage shoots up to 100%. I ran the java profiler (java -Xprof myprog).
These were the results:


Flat profile of 0.60 secs (38 total ticks): main

  Interpreted + native   Method
 12.5%     0  +     4    java.io.WinNTFileSystem.canonicalizeWithPrefix0
  6.3%     2  +     0    sun.nio.cs.ISO_8859_1$Decoder.decodeArrayLoop
  6.3%     0  +     2    java.io.FileInputStream.open
  6.3%     2  +     0    java.util.Arrays.copyOfRange
  6.3%     0  +     2    sun.awt.Win32GraphicsEnvironment.initDisplay
  3.1%     0  +     1    sun.awt.windows.WWindowPeer.setFocusableWindow
  3.1%     0  +     1    java.lang.ClassLoader$NativeLibrary.load
  3.1%     0  +     1    java.io.RandomAccessFile.open
  3.1%     0  +     1    sun.nio.ch.FileDispatcher.read0
  3.1%     0  +     1    java.lang.ClassLoader.findBootstrapClass
  3.1%     1  +     0    java.lang.Character.valueOf
  3.1%     1  +     0    java.util.HashSet.add
  3.1%     1  +     0    sun.java2d.loops.GraphicsPrimitive.makeUniqueID
  3.1%     1  +     0    java.awt.Dialog.<clinit>
  3.1%     1  +     0    javax.swing.plaf.basic.BasicTextUI.installKeyboardActio
ns
  3.1%     1  +     0    sun.java2d.loops.GraphicsPrimitiveMgr.registerGeneral
  3.1%     0  +     1    sun.awt.windows.WDesktopProperties.init
  3.1%     1  +     0    javax.swing.JComponent.setUI
  3.1%     1  +     0    javax.swing.plaf.metal.DefaultMetalTheme.getUserTextFon
t
  3.1%     1  +     0    java.io.BufferedReader.readLine
  3.1%     1  +     0    sun.font.CMap$CMapFormat4.<init>
  3.1%     1  +     0    java.lang.String.toLowerCase
  3.1%     1  +     0    java.util.Properties$LineReader.readLine
 93.8%    16  +    14    Total interpreted

  Thread-local ticks:
 15.8%     6             Blocked (of total)
  6.3%     2             Class loader


Flat profile of 6.55 secs (5 total ticks): Image Fetcher 0

  Interpreted + native   Method
 33.3%     1  +     0    java.util.StringTokenizer.nextToken
 33.3%     1  +     0    sun.util.calendar.ZoneInfo.getOffsets
 33.3%     1  +     0    sun.awt.image.GifImageDecoder.parseImage
100.0%     3  +     0    Total interpreted

  Thread-local ticks:
 40.0%     2             Blocked (of total)



After this it just hung, so I had to close it.
Please help me find the problem that is making my program use all of the CPU!
Thanks.
Offline Riven
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« Reply #1 on: 2007-11-28 17:15:49 »
infinite loop
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Offline Javaisthefuture

JGO n00b
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Posts: 18
« Reply #2 on: 2007-11-28 17:43:54 »
How do I get rid of this infinite loop?
Games published by our own members! Go get 'em!
Offline princec
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« Reply #3 on: 2007-11-28 20:25:39 »
Pause it in the debugger and find out where it is, first.

Cas Smiley
Play Revenge of the Titans - Play Titan Attacks - Play Droid Assault
Offline oNyx

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Posts: 2943
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pixels! :x
« Reply #4 on: 2007-11-28 21:52:29 »
Or... if you got a command window... press ctrl+break there (does this only work with windows?).
弾幕 ☆ @mahonnaise ☆ blog
Offline Javaisthefuture

JGO n00b
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Posts: 18
« Reply #5 on: 2007-11-29 11:29:14 »
This came up when I pressed Ctrl + Break:


2007-11-29 16:25:08
Full thread dump Java HotSpot(TM) Client VM (1.6.0_03-b05 mixed mode, sharing):

"DestroyJavaVM" prio=6 tid=0x00296000 nid=0x600 waiting on condition [0x00000000
..0x0090fd4c]
   java.lang.Thread.State: RUNNABLE

"Thread-2" prio=6 tid=0x0306cc00 nid=0x9a8 runnable [0x033cf000..0x033cfd14]
   java.lang.Thread.State: RUNNABLE
        at java.awt.EventQueue.postEvent(Unknown Source)
        at javax.swing.SystemEventQueueUtilities.queueComponentWorkRequest(Unkno
wn Source)
        at javax.swing.SystemEventQueueUtilities.queueComponentWorkRequest(Unkno
wn Source)
        at javax.swing.RepaintManager.addDirtyRegion0(Unknown Source)
        at javax.swing.RepaintManager.addDirtyRegion(Unknown Source)
        at javax.swing.JFrame.repaint(Unknown Source)
        at java.awt.Component.repaint(Unknown Source)
        at ronansautotyperuk.run(ronansautotyperuk.java:1477)
        at java.lang.Thread.run(Unknown Source)

"AWT-EventQueue-0" prio=6 tid=0x03056400 nid=0x4b0 runnable [0x02fce000..0x02fcf
a14]
   java.lang.Thread.State: RUNNABLE
        at sun.java2d.loops.DrawGlyphListLCD.DrawGlyphListLCD(Native Method)
        at sun.java2d.pipe.LCDTextRenderer.drawGlyphList(Unknown Source)
        at sun.java2d.pipe.GlyphListPipe.drawString(Unknown Source)
        at sun.java2d.pipe.ValidatePipe.drawString(Unknown Source)
        at sun.java2d.SunGraphics2D.drawString(Unknown Source)
        at sun.swing.SwingUtilities2.drawString(Unknown Source)
        at sun.swing.SwingUtilities2.drawStringUnderlineCharAt(Unknown Source)
        at javax.swing.plaf.metal.MetalButtonUI.paintText(Unknown Source)
        at javax.swing.plaf.basic.BasicButtonUI.paintText(Unknown Source)
        at javax.swing.plaf.basic.BasicButtonUI.paint(Unknown Source)
        at javax.swing.plaf.metal.MetalButtonUI.update(Unknown Source)
        at javax.swing.JComponent.paintComponent(Unknown Source)
        at javax.swing.JComponent.paint(Unknown Source)
        at javax.swing.JComponent.paintChildren(Unknown Source)
        - locked <0x22ea14b8> (a java.awt.Component$AWTTreeLock)
        at javax.swing.JComponent.paint(Unknown Source)
        at javax.swing.JComponent.paintChildren(Unknown Source)
        - locked <0x22ea14b8> (a java.awt.Component$AWTTreeLock)
        at javax.swing.JComponent.paint(Unknown Source)
        at javax.swing.JLayeredPane.paint(Unknown Source)
        at javax.swing.JComponent.paintChildren(Unknown Source)
        - locked <0x22ea14b8> (a java.awt.Component$AWTTreeLock)
        at javax.swing.JComponent.paintToOffscreen(Unknown Source)
        at javax.swing.BufferStrategyPaintManager.paint(Unknown Source)
        at javax.swing.RepaintManager.paint(Unknown Source)
        at javax.swing.JComponent.paint(Unknown Source)
        at java.awt.GraphicsCallback$PaintCallback.run(Unknown Source)
        at sun.awt.SunGraphicsCallback.runOneComponent(Unknown Source)
        at sun.awt.SunGraphicsCallback.runComponents(Unknown Source)
        at java.awt.Container.paint(Unknown Source)
        at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
        at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
        at javax.swing.RepaintManager.seqPaintDirtyRegions(Unknown Source)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(Unknow
n Source)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)

"AWT-Windows" daemon prio=6 tid=0x02a8a800 nid=0xd84 runnable [0x02f0f000..0x02f
0fa94]
   java.lang.Thread.State: RUNNABLE
        at sun.awt.windows.WToolkit.eventLoop(Native Method)
        at sun.awt.windows.WToolkit.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)

"AWT-Shutdown" prio=6 tid=0x02a89c00 nid=0xa80 in Object.wait() [0x02ebf000..0x0
2ebfb14]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x22ea1718> (a java.lang.Object)
        at java.lang.Object.wait(Object.java:485)
        at sun.awt.AWTAutoShutdown.run(Unknown Source)
        - locked <0x22ea1718> (a java.lang.Object)
        at java.lang.Thread.run(Unknown Source)

"Java2D Disposer" daemon prio=10 tid=0x02a88400 nid=0xfb0 in Object.wait() [0x02
e6f000..0x02e6fb94]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x22ea17b0> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(Unknown Source)
        - locked <0x22ea17b0> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(Unknown Source)
        at sun.java2d.Disposer.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)

"Low Memory Detector" daemon prio=6 tid=0x02a5c800 nid=0x7dc runnable [0x0000000
0..0x00000000]
   java.lang.Thread.State: RUNNABLE

"CompilerThread0" daemon prio=10 tid=0x02a57c00 nid=0x364 waiting on condition [
0x00000000..0x02d0f61c]
   java.lang.Thread.State: RUNNABLE

"Attach Listener" daemon prio=10 tid=0x02a56800 nid=0x98 runnable [0x00000000..0
x00000000]
   java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" daemon prio=10 tid=0x02a55400 nid=0xad8 waiting on condition
 [0x00000000..0x00000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" daemon prio=8 tid=0x02a51400 nid=0x314 in Object.wait() [0x02c1f000.
.0x02c1fa94]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x22ea1a08> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(Unknown Source)
        - locked <0x22ea1a08> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(Unknown Source)
        at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)

"Reference Handler" daemon prio=10 tid=0x02a4cc00 nid=0x50c in Object.wait() [0x
02bcf000..0x02bcfb14]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x22ea14b0> (a java.lang.ref.Reference$Lock)
        at java.lang.Object.wait(Object.java:485)
        at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)
        - locked <0x22ea14b0> (a java.lang.ref.Reference$Lock)

"VM Thread" prio=10 tid=0x02a4b800 nid=0xaf4 runnable

"VM Periodic Task Thread" prio=10 tid=0x02a77400 nid=0xeac waiting on condition


JNI global references: 1384

Heap
 def new generation   total 960K, used 262K [0x22960000, 0x22a60000, 0x22e40000)

  eden space 896K,  28% used [0x22960000, 0x229a0ef0, 0x22a40000)
  from space 64K,   4% used [0x22a40000, 0x22a40c58, 0x22a50000)
  to   space 64K,   0% used [0x22a50000, 0x22a50000, 0x22a60000)
 tenured generation   total 4096K, used 569K [0x22e40000, 0x23240000, 0x26960000
)
   the space 4096K,  13% used [0x22e40000, 0x22ece670, 0x22ece800, 0x23240000)
 compacting perm gen  total 12288K, used 211K [0x26960000, 0x27560000, 0x2a96000
0)
   the space 12288K,   1% used [0x26960000, 0x26994ca8, 0x26994e00, 0x27560000)
    ro space 8192K,  62% used [0x2a960000, 0x2ae614a8, 0x2ae61600, 0x2b160000)
    rw space 12288K,  52% used [0x2b160000, 0x2b7a7278, 0x2b7a7400, 0x2bd60000)
Offline princec
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JGO Kernel
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Posts: 8069
Medals: 91


Eh? Who? What? ... Me?
« Reply #6 on: 2007-11-29 12:49:39 »
So Thread-2 is doing ronansautotyperuk.run(ronansautotyperuk.java:1477) and calling repaint() on some component over and over again. Let's see the source to this bit.

Cas Smiley
Play Revenge of the Titans - Play Titan Attacks - Play Droid Assault
Offline Javaisthefuture

JGO n00b
*

Posts: 18
« Reply #7 on: 2007-11-29 13:32:44 »
In the Run() method?
Offline Javaisthefuture

JGO n00b
*

Posts: 18
« Reply #8 on: 2007-11-29 13:37:38 »
Here is the code:

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import java.awt.*;
import java.awt.Robot.*;
import javax.swing.*;
import java.io.*;
import java.awt.event.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.applet.AudioClip;
import java.net.*;

public class ronansautotyperuk extends JFrame implements Runnable, ActionListener
{
   JTextField comments = new JTextField("Enter your message to be typed here", 25);
   JTextField delaytime = new JTextField("Enter miliseconds between each letter press", 23);
   JButton starttyping = new JButton("Start Typing");
   JButton stoptyping = new JButton("Stop Typing");
   
   Thread runner;
   Boolean gameover = false;
   Boolean running = true;
   Boolean istyping = false;
   int pausefor;
   int realpausefor = 7;
   int numb = 0;
   String stringOfCharsToType;
   String delayfor;
   int delayforint;
   Image icon;
   
   public ronansautotyperuk()
   {
      super("Ronan's Autotyper UK - Version 1.0");
      setSize(800, 75);
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setDefaultLookAndFeelDecorated(true);
      setVisible(true);
      setResizable(false);
      Container contentArea = getContentPane();
      contentArea.setBackground(Color.red);
      FlowLayout flowManager = new FlowLayout();
      contentArea.setLayout(flowManager);
      
      contentArea.add(comments);
      contentArea.add(delaytime);
      contentArea.add(starttyping);
      contentArea.add(stoptyping);
      starttyping.addActionListener(this);
      stoptyping.addActionListener(this);
      setContentPane(contentArea);
      
      Toolkit toolkit = Toolkit.getDefaultToolkit();
      icon = toolkit.getImage( getClass().getResource("icon.gif") );
      MediaTracker mediatracker = new MediaTracker(this);
      mediatracker.addImage(icon, 0);
      try
      {
         mediatracker.waitForID(0);
      }
      catch(InterruptedException interruptedexception)
      {
         System.out.println("Download Error");
      }
      setIconImage(icon);
      start();
   }
   
   public void actionPerformed(ActionEvent event)
   {
      if(event.getSource() == starttyping) starttypingnow();
      if(event.getSource() == stoptyping) stoptypingnow();
   }
   
   public void start()
   {
      setVisible(true);
      requestFocus();
      running = true;
      runner = new Thread(this);
      runner.start();
   }
   
   public void stopgame()
   {
      if(running != null)
      running = null;
   }
   
   public void destroy()
   {
      
   }
   
   public void starttypingnow()
   {
      pausefor = 2000;
      istyping = false;
      stringOfCharsToType = comments.getText();
      delayfor = delaytime.getText();
      delayforint = Integer.parseInt(delayfor);
   }
   
   public void stoptypingnow()
   {
      istyping = false;
      numb = 0;
   }
   
   public void typenow()
   {
      if(numb < stringOfCharsToType.length() && istyping)
      {
         char thing = stringOfCharsToType.charAt(numb);
         numb++;
         if(thing == 'a')
         {
            try
            {
               Robot bot = new Robot();
               bot.keyPress(KeyEvent.VK_A);
               bot.keyRelease(KeyEvent.VK_A);
            }
            catch(Exception exc)
            {
               System.out.println(exc);
            }
         }
      }
      if(numb >= stringOfCharsToType.length())
      {
         try
         {
            Robot bot = new Robot();
            bot.keyPress(KeyEvent.VK_ENTER);
            bot.keyRelease(KeyEvent.VK_ENTER);
         }
         catch(Exception exc)
         {
            System.out.println(exc);
         }
         numb = 0;
      }
   }
   
   public void gameupdate()
   {
      if(!gameover)
      {
         if(istyping)
         {
            typenow();
         }
      }
   }
   
   public void run()
   {
      while (running)
      {
         repaint();
         gameupdate();
         try
         {
            if(pausefor != 2000)
            {
               pausefor = delayforint;
               Thread.sleep(pausefor);
            }
            if(pausefor == 2000)
            {
               Thread.sleep(pausefor);
               pausefor = realpausefor;
               istyping = true;
            }
         }
         catch(InterruptedException e) {}
      }
   }

   public static void main (String[] args)
   {
      ronansautotyperuk eg = new ronansautotyperuk();
   }
}
Offline gouessej

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Posts: 3557
Medals: 30


TUER
« Reply #9 on: 2007-11-29 14:50:27 »
Instead of this :

Toolkit toolkit = Toolkit.getDefaultToolkit();
      icon = toolkit.getImage( getClass().getResource("icon.gif") );
      MediaTracker mediatracker = new MediaTracker(this);
      mediatracker.addImage(icon, 0);
      try
      {
         mediatracker.waitForID(0);
      }
      catch(InterruptedException interruptedexception)
      {
         System.out.println("Download Error");
      }
      setIconImage(icon);


do this :
icon = new ImageIcon( getClass().getResource("icon.gif") ).getImage();
Julien Gouesse
Games published by our own members! Go get 'em!
Offline Javaisthefuture

JGO n00b
*

Posts: 18
« Reply #10 on: 2007-11-29 15:09:48 »
Do I still do this bit?

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setIconImage(icon);
Offline Javaisthefuture

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Posts: 18
« Reply #11 on: 2007-11-29 15:17:52 »
Still 100% CPU usage!
Offline cylab

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« Reply #12 on: 2007-11-29 18:43:41 »
You are doing some messy stuff with your timing variables. Shocked

Your problem might be, that two of your variables (pausefor, delayforint) are not initialized to a sensible value and will default to 0. Also realpausefor is only set to 7. So your Thread.sleep() will either sleep 0ms or 7ms, which is both way too small to prevent your loop from taking 100% CPU time.
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Offline Javaisthefuture

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Posts: 18
« Reply #13 on: 2007-11-30 10:00:20 »
But the sleep time is set by the user, this will define on how fast the program will do Robot.press()
How else could I do it to stop 100% CPU usage?
Offline broumbroum

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Posts: 384
« Reply #14 on: 2007-11-30 10:31:36 »
Quote from: Javaisthefuture on 2007-11-28 16:50:41
Hi,
When I start my program the CPU Usage shoots up to 100%. I ran the java profiler (java -Xprof myprog).
These were the results:


Flat profile of 0.60 secs (38 total ticks): main

  Interpreted + native   Method
 12.5%     0  +     4    java.io.WinNTFileSystem.canonicalizeWithPrefix0

(...)


After this it just hung, so I had to close it.
Please help me find the problem that is making my program use all of the CPU!
Thanks.
This is a known bug in Windows JFileChooser as described in the bug database with id : http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6578753
Getting back to Java release 5 does solve this problematic issue.  Smiley
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Offline erikd

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« Reply #15 on: 2007-11-30 11:00:11 »
Nah, the JFileChooser bug is totally unrelated and is not even used here  Roll Eyes

I'm also suspecting something with the timing. Could you try sleeping with a hardcoded value of 100 or something?
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Offline Javaisthefuture

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Posts: 18
« Reply #16 on: 2007-11-30 11:24:34 »
But the sleep time is set by the user, this will define on how fast the program will do Robot.press()
How else could I do it to stop 100% CPU usage?
Offline cylab

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« Reply #17 on: 2007-12-02 08:12:08 »
Quote from: Javaisthefuture on 2007-11-30 11:24:34
But the sleep time is set by the user, this will define on how fast the program will do Robot.press()
.
Yeah, but it is 0 BY DEFAULT before the user choose the sleep time. Set it to 100 by default and specify a minimum for the value the user can enter
Mathias - I Know What [you] Did Last Summer!
Offline Javaisthefuture

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Posts: 18
« Reply #18 on: 2007-12-02 16:10:44 »
Thanks!!! You solved it!
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