Memory Leak with ObjectInputStream - Any takers....
Hi,
Anyone see how to remove the memory leak problem in my objectInputstream ? Increases during the while loop...
private static String message = " ";
while(true) {
try {
message = (String) sharedRef.iStream.readObject();
System.out.println("Length of Message: " + message.length() );
message = null;
System.gc();
sharedRef.memchk();
} catch ( Exception e ) {
//sharedRef.screen.setText(buf.toString());
//sharedRef.screen.append("Connection closed...");
//sharedRef.closeConnections();
//this.stop();
}Output.... (example):
2006-04-10 16:11:51 +++ Free: 66067688
Length of Message: 92
2006-04-10 16:11:52 +++ Free: 66067448
Length of Message: 92
2006-04-10 16:11:52 +++ Free: 66067272
Length of Message: 92
2006-04-10 16:11:53 +++ Free: 66067032
Length of Message: 92
2006-04-10 16:11:53 +++ Free: 66066792
Length of Message: 92
2006-04-10 16:11:54 +++ Free: 66066552
Length of Message: 92
2006-04-10 16:11:54 +++ Free: 66066376
Length of Message: 92
2006-04-10 16:11:56 +++ Free: 66066136
Length of Message: 92
2006-04-10 16:11:57 +++ Free: 66065896
Length of Message: 92
2006-04-10 16:11:57 +++ Free: 66065656
Thanks
Object streams cache objects they've read and written. This is so that you don't have to write the same object multiple times if it's referred to multiple times. Let's say that both obj1 and obj2 have references to obj3. When you write obj1, it will also write obj3, and the OOStream will cache both obj1 and obj3. Later, when you go to write obj2, it will notice that it has already written obj2, and not write it again--it will just write a reference of sorts to indicate which already-written object obj2 points to as a member.
I would imagine OIStream must do the same thing. It would have to cache objects it's reading, so that when a "reference" (in the general sense) to a previous object appears, it can behandled properly.
On the OOS side, you can flush the cache by calling reset(). I doubt you can do anything about it in the OIS side. Input's behavior here must be driven by what was output.
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Java Plug-in 1.6.0_07
Using JRE version 1.6.0_07 Java HotSpot(TM) Client VM
Windows XP - SP2
I have a commercial application that has developed a memory leak with the introduction of the latest plugin. The applets chew up memory and eventually freeze. They did not before. Using jvisualm I see a build up of native arrays, primarily int[][] and char[]. I'm still investigating. Anyone have a similar experience?
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It seems there is a memory leak with JPopupMenu. The following program demonstrates this leak. If you run the program, click on show form, and then close the form, the used memory will be GCd appropriately. If you click on show form, then right click on the table to show the popup (even if you dont do anything else with the popup) then close the form, it never GCs the form. I've tried all kinds of crazy things, but I cant seem to find what is keeping the memory from being GCd.
Peter
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.beans.PropertyChangeListener;
import java.text.DecimalFormat;
import java.util.Timer;
import java.util.TimerTask;
import java.util.Vector;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.AbstractTableModel;
@SuppressWarnings("serial")
public class TriState extends JPanel {
private static final long K = 1024;
private static final long M = K * K;
private static final long G = M * K;
private static final long T = G * K;
protected static int ctr = 1;
private JButton btnShow = new JButton("Show Form");
private JLabel lblMem = new JLabel();
private static final DecimalFormat df = new DecimalFormat("#,##0.#");
protected Timer updateTimer = new Timer();
public TriState() {
this.setLayout(new GridLayout());
add(btnShow);
add(lblMem);
updateTimer.scheduleAtFixedRate(new UpdateTimerTask(), 1000, 1000);
btnShow.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
FrmReferrals fr = new FrmReferrals();
fr.setVisible(true);
class UpdateTimerTask extends TimerTask {
public void run() {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
dumpMemoryUsage();
protected void dumpMemoryUsage() {
System.gc();
Long t = Runtime.getRuntime().totalMemory();
long f = Runtime.getRuntime().freeMemory();
String st = convertToStringRepresentation(t);
String sf = convertToStringRepresentation(f);
String su = convertToStringRepresentation(t - f);
System.out.println("Total:" + st + "(" + t + ") Free:" + sf + "(" + f + ") Used:" + su + "(" + (t - f) + ")");
lblMem.setText(su + "/" + st);
public static String convertToStringRepresentation(final long value) {
final long[] dividers = new long[]{T, G, M, K, 1};
final String[] units = new String[]{"TB", "GB", "MB", "KB", "B"};
if (value < 1)
throw new IllegalArgumentException("Invalid file size: " + value);
String result = null;
for (int i = 0; i < dividers.length; i++) {
final long divider = dividers;
if (value >= divider) {
final double dr = divider > 1 ? (double) value / (double) divider : (double) value;
result = df.format(dr) + units[i];
break;
return result;
private static void createAndShowGUI() {
JFrame frame = new JFrame("SimpleTableDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create and set up the content pane.
TriState newContentPane = new TriState();
newContentPane.setOpaque(true); // content panes must be opaque
frame.setContentPane(newContentPane);
// Display the window.
frame.pack();
frame.setVisible(true);
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
protected class PopupMenu extends JPopupMenu {
public PopupMenu() {
JRadioButtonMenuItem item1 = new JRadioButtonMenuItem(new AbstractAction("Insert Item") {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand());
item1.setActionCommand("Insert");
add(item1);
JRadioButtonMenuItem item2 = new JRadioButtonMenuItem(new AbstractAction("Delete Item") {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand());
item2.setActionCommand("Delete");
add(item2);
public class FrmReferrals extends JFrame {
public FrmReferrals() {
super();
init();
protected void init() {
jbInit();
protected void closeIt() {
uninit();
// variables here
protected Dimension dimPreferred = new Dimension(1270, 995);
protected JTabbedPane tabbedPane = new JTabbedPane();
protected JTable tblReferrals = null;
protected PopupMenu popMenu = new PopupMenu();
protected void jbInit() {
setPreferredSize(dimPreferred);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setTitle("Referrals");
JPanel pnl = new JPanel();
pnl.setOpaque(false);
pnl.setLayout(new BorderLayout());
pnl.add(tabbedPane, BorderLayout.CENTER);
// put it all in the frame
add(pnl);
pack();
setLocationRelativeTo(null);
// init the table and model
ReferralsTableModel ctm = new ReferralsTableModel(buildDummyVector());
tblReferrals = new JTable(ctm);
tblReferrals.setComponentPopupMenu(popMenu);
tblReferrals.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
tabbedPane.add(new JScrollPane(tblReferrals, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED));
addWindowListener(new WindowListener() {
@Override
public void windowActivated(WindowEvent e) {}
@Override
public void windowClosed(WindowEvent e) {}
@Override
public void windowClosing(WindowEvent e) {
closeIt();
@Override
public void windowDeactivated(WindowEvent e) {}
@Override
public void windowDeiconified(WindowEvent e) {}
@Override
public void windowIconified(WindowEvent e) {}
@Override
public void windowOpened(WindowEvent e) {}
protected Vector<DBO_Referrals> buildDummyVector() {
Vector<DBO_Referrals> vr = new Vector<DBO_Referrals>();
for (int x = 0; x < 5000; x++) {
DBO_Referrals r = new DBO_Referrals(x+(5000*ctr));
vr.add(r);
return vr;
protected void uninit() {
tblReferrals.setComponentPopupMenu(null);
for (Component c : popMenu.getComponents()) {
PropertyChangeListener[] pl = c.getPropertyChangeListeners();
for (PropertyChangeListener l : pl)
c.removePropertyChangeListener(l);
if (c instanceof JMenuItem) {
ActionListener [] al = ((JMenuItem)c).getActionListeners();
for (ActionListener l : al) {
((JMenuItem)c).removeActionListener(l);
popMenu = null;
protected class DBO_Referrals {
protected long id;
protected String Employee;
protected String Rep;
protected String Asst;
protected String Client;
protected String Dates;
protected String Status;
protected String Home;
public DBO_Referrals(long id) {
this.id = id;
Employee = "Employee" + id;
Rep = "Rep" + id;
Asst = "Asst" + id;
Client = "Client" + id;
Dates = "Dates" + id;
Status = "Status" + id;
Home = "Home" + id;
public long getId() {
return id;
public String getEmployee() {
return Employee;
public String getRep() {
return Rep;
public String getAsst() {
return Asst;
public String getClient() {
return Client;
public String getDates() {
return Dates;
public String getStatus() {
return Status;
public String getHome() {
return Home;
public class ReferralsTableModel extends AbstractTableModel {
protected Vector<DBO_Referrals> data = new Vector<DBO_Referrals>();
protected String[] sColumns = {"id", "Employee", "Rep", "Assistant", "Client", "Date", "Status", "Home", "R"};
public ReferralsTableModel() {
super();
public ReferralsTableModel(Vector<DBO_Referrals> data) {
this();
this.data = data;
@SuppressWarnings("unchecked")
@Override
public Class getColumnClass(int col) {
switch (col) {
case 0 :
return Long.class;
default :
return String.class;
@Override
public int getColumnCount() {
return sColumns.length;
@Override
public int getRowCount() {
return data.size();
@Override
public Object getValueAt(int row, int col) {
if (row > data.size())
return null;
DBO_Referrals a = data.get(row);
switch (col) {
case 0 :
return a.getId();
case 1 :
return a.getEmployee();
case 2 :
return a.getRep();
case 3 :
return a.getAsst();
case 4 :
return a.getClient();
case 5 :
return a.getDates();
case 6 :
return a.getStatus();
case 7 :
return a.getHome();
case 8 :
return "+";
default :
return null;BTW instead of continually printing out the memory use a profiler (jvisualvm in the jdk/bin directory -> heapdump -> search on your class -> view in instances -> find nearest GC root).
Looks like BasicPopupMenuUI doesn't remove a reference to the JRootPane immediately. As far as I can see it will be removed when another menu shows.
As a hackish workaround you can try this in you FrmReferrals#uninit():
for(ChangeListener listener : MenuSelectionManager.defaultManager().getChangeListeners()) {
if (listener.getClass().getName().contains("MenuKeyboardHelper")) {
try {
Field field = listener.getClass().getDeclaredField("menuInputMap");
field.setAccessible(true);
field.set(listener, null);
} catch (Exception e) {
// ignored
break;
}Funnily enough though it isn't there when I reduce your code to a SSCCE:
import java.awt.*;
import javax.swing.*;
public class TestBasicPopupMenuUILeak extends JFrame {
public TestBasicPopupMenuUILeak() {
super("Not collected right away");
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(
new JButton(new AbstractAction("Show frame") {
@Override
public void actionPerformed(ActionEvent e) {
EventQueue.invokeLater(new Runnable() {
public void run() {
JLabel label = new JLabel(
"Right click to show popup, then close this frame."
+ "The frame with not be GCed until another (popup) menu is shown.");
JPopupMenu popup = new JPopupMenu(
"Popup");
popup.add("Item");
label.setComponentPopupMenu(popup);
// named differently so you can find it
// easily in your favorite profiler
JFrame frame = new TestBasicPopupMenuUILeak();
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(label);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} -
Hello all,
Not sure if this is the right place to post this but here goes. I have a program that needs to change the font of at least 250,000 letters, however after doing this the program runs slow and laggy as if changing the fonts of each letter took up memory and never released it? Here is a compilable example, Click the button at the bottom of the window and watch the letter it is currently working on. You will notice that around 200,000 it will begin to not smoothly count up anymore but count in kind of a skipping pattern. This seems to get worse the more you do it and seems to indicate to me that something is using memory and not releasing it. I'm not sure why replacing a letter's font with a new font would cause more memory to be taken up I would think if I was doing it properly it would simply replace the old font with the new one not taking anymore memory then it did before. Here is the example: This program sometimes locks up so be prepared. If someone could maybe point out what is causing this to take up more memory after changing the fonts that would be great and hopefully find a solution :) Thanks in advance.
-neptune692
* To change this template, choose Tools | Templates
* and open the template in the editor.
package paintsurface;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.util.List;
public class PaintSurface implements Runnable, ActionListener {
public static void main(String[] args) {
SwingUtilities.invokeLater(new PaintSurface());
List<StringState> states = new ArrayList<StringState>();
Tableaux tableaux;
Random random = new Random();
Font font = new Font("Arial",Font.PLAIN,15);
// Point mouselocation = new Point(0,0);
static final int WIDTH = 1000;
static final int HEIGHT = 1000;
JFrame frame = new JFrame();
JButton add;
public void run() {
tableaux = new Tableaux();
for (int i=250000; --i>=0;)
addRandom();
frame.add(tableaux, BorderLayout.CENTER);
add = new JButton("Change Font of letters - memory leak?");
add.addActionListener(this);
frame.add(add, BorderLayout.SOUTH);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(WIDTH, HEIGHT);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
public void actionPerformed(ActionEvent e) {
new Thread(new ChangeFonts()).start();
void addRandom() {
tableaux.add(
Character.toString((char)('a'+random.nextInt(26))),
UIManager.getFont("Button.font"),
random.nextInt(WIDTH), random.nextInt(HEIGHT));
//THIS CLASS SEEMS TO HAVE SOME KIND OF MEMORY LEAK I'M NOT SURE?
class ChangeFonts implements Runnable {
public void run() {
Random rand = new Random();
for(int i = 0; i<states.size(); i++) {
font = new Font("Arial",Font.PLAIN,rand.nextInt(50));
states.get(i).font = font;
add.setText("Working on letter - "+i);
class StringState extends Rectangle {
StringState(String str, Font font, int x, int y, int w, int h) {
super(x, y, w, h);
string = str;
this.font = font;
String string;
Font font;
class Tableaux extends JComponent {
Tableaux() {
this.enableEvents(MouseEvent.MOUSE_MOTION_EVENT_MASK);
lagState = createState("Lag", new Font("Arial",Font.BOLD,20), 0, 0);
protected void processMouseMotionEvent(MouseEvent e) {
repaint(lagState);
lagState.setLocation(e.getX(), e.getY());
repaint(lagState);
super.processMouseMotionEvent(e);
StringState lagState;
StringState createState(String str, Font font, int x, int y) {
FontMetrics metrics = getFontMetrics(font);
int w = metrics.stringWidth(str);
int h = metrics.getHeight();
return new StringState(str, font, x, y-metrics.getAscent(), w, h);
public void add(String str, Font font, int x, int y) {
StringState state = createState(str, font, x, y);
states.add(state);
repaint(state);
protected void paintComponent(Graphics g) {
Rectangle clip = g.getClipBounds();
FontMetrics metrics = g.getFontMetrics();
for (StringState state : states) {
if (state.intersects(clip)) {
if (!state.font.equals(g.getFont())) {
g.setFont(state.font);
metrics = g.getFontMetrics();
g.drawString(state.string, state.x, state.y+metrics.getAscent());
if (lagState.intersects(clip)) {
g.setColor(Color.red);
if (!lagState.font.equals(g.getFont())) {
g.setFont(lagState.font);
metrics = g.getFontMetrics();
g.drawString("Lag", lagState.x, lagState.y+metrics.getAscent());
}Here is the block of code that I think is causing the problem:
//THIS CLASS SEEMS TO HAVE SOME KIND OF MEMORY LEAK I'M NOT SURE?
class ChangeFonts implements Runnable {
public void run() {
Random rand = new Random();
for(int i = 0; i<states.size(); i++) {
font = new Font("Arial",Font.PLAIN,rand.nextInt(50));
states.get(i).font = font; // this line seems to cause the problem?
add.setText("Working on letter - "+i);
}neptune692 wrote:
jverd wrote:
You're creating a quarter million distinct Font objects, and obviously you must be hanging on to all of them because each character is having its font set to the newly created object. So if you have 250k chars, you're forcing it to have 250k Font objects.
Since the only difference is that rand.nextInt(50) parameter, just pre-create 50 Font objects with 0..49, stick 'em in the corresponding elements in an array, and use rand.nextInt to select the Font object to use.That does make sense but it does that when the the program is first launched and doesn't lag. But the second and third time you change the letters font it seems to lag so if it wasn't taking up more memory the second time it should perform like it did when it first launched. I don't care to investigate any further. The real problem is almost certainly the quarter million Font objects. It could be that 250k is fine, but by the time you get to 500k, it has to do a lot of GC, and that's where the slow down is coming. You might even be able to make it work better with the code you have just by tweaking the GC parameters at startup, but I wouldn't bother. Fix the code first, and then see if you have issues.
Does creating a new font for each of those letters not replace the old font object? If it didn't use more memory the second and third time I don't think you would see the skipping in the counter and the slowing down of the iterations. So it must be remembering some of the old font objects or am I wrong?Using new always creates a new object. When you do it the second time around, and call letter.setFont(newFont), the old Font object is eligible for GC. That doesn't mean it will be GCed right away though. The JVM can leave them all laying around until it runs out of memory, and then GC some or all of them. -
Memory leak with CGImageSourceCreateThumbnailAtIndex
After creating a thumbnail with CGImageSourceCreateThumbnailAtIndex, CGImageRelease doesn't seem to work!? I am rendering full-size thumbnails of PDF pages, and this just leaks memory:
void memLeakTest(CFStringRef sourcePath) {
printf("Running memLeakTest...
CFURLRef url = CFURLCreateWithString(NULL, sourcePath, NULL);
CGImageSourceRef imageSource = CGImageSourceCreateWithURL(url, NULL);
CFStringRef keys[3];
CFTypeRef values[3];
int n=0;
keys[n] = kCGImageSourceCreateThumbnailFromImageAlways;
values[n++] = kCFBooleanTrue; //If I set this to false, there is no leak, but I need the thumbnails
keys[n] = kCGImageSourceCreateThumbnailWithTransform;
values[n++] = kCFBooleanTrue;
keys[n] = kCGImageSourceShouldCache;
values[n++] = kCFBooleanFalse;
CFDictionaryRef options;
options = CFDictionaryCreate(kCFAllocatorDefault, (const void **)keys, values, n, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
CGImageRef image = CGImageSourceCreateThumbnailAtIndex(imageSource, 0, options);
CFRelease( imageSource );
CGImageRelease( image ); //Doesn't seem to have any effect. Memory continues to balloon.
CFRelease( url );
int main (int argc, const char * argv[]) {
CFStringRef pathUrl = CFSTR("file:/path/to/a/big.pdf");
while( true ) {
memLeakTest( pathUrl );
if( n < maxPages ) sleep(5); //Wait 5 seconds
return 0;I was able to fix the memory leak using the following code:
void memLeakTest(CFStringRef sourcePath) {
printf("Running memLeakTest...
CFURLRef url = CFURLCreateWithString(NULL, sourcePath, NULL);
CFStringRef keys[10];
CFTypeRef values[10];
int n=0;
//keys[n] = kCGImageSourceCreateThumbnailFromImageIfAbsent;
//values[n++] = kCFBooleanTrue;
keys[n] = kCGImageSourceCreateThumbnailFromImageAlways;
values[n++] = kCFBooleanTrue;
keys[n] = kCGImageSourceCreateThumbnailWithTransform;
values[n++] = kCFBooleanTrue;
keys[n] = kCGImageSourceShouldCache;
values[n++] = kCFBooleanFalse;
CFDictionaryRef options;
options = CFDictionaryCreate(kCFAllocatorDefault, (const void **)keys, values, n,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
//CGImageSourceRef imageSource = CGImageSourceCreateWithURL(url, options);
NSImage* imageFile = [[NSImage alloc] initByReferencingURL: (NSURL *)url];
NSData * data = [imageFile TIFFRepresentation];
CGImageSourceRef imageSource = CGImageSourceCreateWithData((CFDataRef)data, options);
CGImageRef image = CGImageSourceCreateThumbnailAtIndex(imageSource, 0, options);
CFRelease( image );
CFRelease( imageSource );
[imageFile release];
CFRelease( options );
CFRelease( url );
There are a number of different graphics APIs you could use. I'm no expert in any of them, so I used the simple ones. The above code requires both Objective-C and an autorelease pool, but I'm sure you could use different functions to remove those requirements. -
Memory Leak with 4.5.1/Java/Solaris
Hi,
We are currently running a Java Application using RMI/Weblogic 4.5.1/Solaris 5.7/Java 1.22.
Behavior that has been observered during the day is that memory usage reaches a stage in which it begins increasing and GC doesn't recover any memory, until the heap reaches an extremly large size, then recovers a significant amount of memory.
We have even seen the java process grab more memory than specified in the -Xmx parameter and experience a java.lang.OutOfMemory error.
I have seen postings that describe similar issues in this newsgroup, but none that define a solution.
This problem is intermittent, and our application can run an entire day without experiencing this memory leak. On the other hand there are days when the memory leak occurrs even when the system is idle overnight.
Please let me know any information you have gathered on this subject.
Regards,
Mark Evanstry increasing your virtual memory on your NT system...
"Parasher K. Joshi" <[email protected]> wrote:
>
Hi,
I observed the same confusing stuff in my tests. But I run weblogic 4.5.1 on Windows NT with JDK 1.2.2-w
Usually, I would get a "Low virtual memory" message from windows
and if I click ok & shuffle thourgh my windows I would be ok.
But since last 2 days, I would keep the server running overnight.
When I return in morning,
I would find a "Low virtual memory" message and
on clicking OK. I would find another message tell me that java.exe (which was running weblogic) crashed!!
Now today I tried to watch the memory usage in Task Manager. And I found the most wierd thing.
I saw that even when the system was doing virtually nothing,
except print a string at intervals, the memory usage would go
up steadyly.
Even doing a forced finalization and gc did not seem to stop it.
BUT, BY CHANCE I HAPPEN TO MINIMISE AND MAXIMISE THE WEBLOGIC
CONSOLE OUTPUT WINDOW.
WHAT I SAW IN THE TASK MANAGER AMAZED ME!
THE MEMORY USAGE IN TASK MANAGER HAD GONE DOWN TO 24XXKB, WHILE
IT WAS ABOUT 20000K OR EVEN MORE.
This seems to support the fact that during my test, I would
get the "low virtual memory" message and if OKed it and shuffled
though application windows (maybe minimise, maximise the weblogic
console output window in process), I would be able to complete
my application. But when the message appears during night runs,
nothing is done and by morning, when I reach to work,
I would see that weblogic had crashed!!
You may try that and see if it helps you.
Parasher
Mark Evans <[email protected]> wrote:
Hi,
We are currently running a Java Application using RMI/Weblogic 4.5.1/Solaris 5.7/Java 1.22.
Behavior that has been observered during the day is that memory usage reaches a stage in which it begins increasing and GC doesn't recover any memory, until the heap reaches an extremly large size, then recovers a significant amount of memory.
We have even seen the java process grab more memory than specified in the -Xmx parameter and experience a java.lang.OutOfMemory error.
I have seen postings that describe similar issues in this newsgroup, but none that define a solution.
This problem is intermittent, and our application can run an entire day without experiencing this memory leak. On the other hand there are days when the memory leak occurrs even when the system is idle overnight.
Please let me know any information you have gathered on this subject.
Regards,
Mark Evans -
This is very unusual for my Mab Desktops to do, but all I can figure is that there is a memory leak in the latest update 10.6.4 and that it is effecting everything.
I ran a few apps on Friday night, closed then down but left the computer running. This morning, I tried the same apps and they would'nt load. I had to restart the computer to get them to work. The same thing happened on Thursday. I've fixed permissions so I can rule that out, unless of course it's the RAM it's self but I've ran tests on that and the software says that it's ok.
Any suggestions would be appreciated on this subject.Can you open them, close them, and then immediately reopen them?
Are they crashing or just bouncing in the Dock and never opening?
Open Console and scroll down the log list and look for Diagnostic Reports. See if there are any logs related to the apps or the times the programs didn't open. There are a few sections with Diagnostic Reports. If they full up crash, there should be something under CrashReporter. -
I'm trying to get images from an IP webcam thanks to an ActiveX and process them with IMAQ.
This ActiveX needs a variant to put chars from the image. It seems to work fine, (nearly 'in real-time') when I convert a string into a variant. Nevertheless, I have memory leak, if I put this sub-VI into a while loop.
So, rather than using a string conversion, I've tried to use a Uchar array conversion. It also seems to work but it is really slow and in this case I don't have any leak of memory !
I'm likely misunderstand the memory managment of Labview.
Thank you very much for your help.Sorry for the VIs I've sent.
Here are simplified VIs, with comments that illustrate the problem.
I hope this will bring you clearer informations.
Olivier M.
Attachments:
test_snap.vi 57 KB
InitAxis.vi 36 KB
SnapAxis.vi 38 KB -
Hello everyone.
I need some help with a problem we are having with our application. It consists on Servlets, JMS with MDBs, Xml parsing...
Our application dequeues messages from an Oracle Queue and sends xml-text message to a servlet. It also receives xml-text and enqueues objects in an Oracle Queue.
And it also has access to Oracle Database (context tables, etc).
We are doing everything on Tru64 Unix (and our tests on Win 2000) and we are using WebLogic 6.1.
Our problem is that we have found that it seems that the garbage collector is not running well. I mean, with the time our system is degrading. The memory use increases. It seems to be a memory leak.
We have used a testing tool, OptimizeIt, and we have found that there are
objects that are increasing the use of memory. If we use the option 'java -verbose' we find that it seems to be Hash objects (HashMap, Hashtable) which are increasing the use of memory. In our code we are not using any hashtable nor any class that extends from it (we have deleted everyone).
Can it be due to a problem with WebLogic? A problem with JMS, queues, etc? A problem with JNDI?
Could anybody please help us?
Thanks in advanced.Yes, we see that there are some entries of the type:
java/util/Hahstable$Entry
java/util/Hahstable
weblogic/jndi/Environment
This entries keep growing and growing with the time.
We have deleted all the Hashtable, Properties and all the kind of Collection objects. I guess WebLogic is using this objects in order to arrange our application runs.
Am I right? Do you know if we can do anything?
Thank you. -
Memory leak with fieldpoint and labview
I have an application which is showing an issue of a memory leak. The application does several things, but the part that seems to be causing the trouble is related to use of Fieldpoint VIs. The application reads individual AI channels on a Fieldpoint AI-110 (10 channels, where the set of channels is measured once per second) I have attached the code related to this. The memory leak is quite large (~1.5GB in 24 hours of operation).
I am using LabView 7.1, and Fieldpoint 4.1. The parent application which uses the attached code is a stand-alone application. The operating system is Windows 2000. Fieldpoint communication occurs over a RS-232 link.
Thanks in advance,
Andy
Attachments:
FPAI100_meas_voltage.vi 62 KBHi Andy,
I did not see anything fundamentally wrong with what you wrote, but there were
a few things that I think could be used to be changed. However, there
were a few things that I did modify that might make a bit of a
difference. In your application you were using sequences and a bunch of
local variables. Since LabVIEW is based upon data flow, you can control
the sequence of execution by making data dependencies and simply wiring one
thing to the next. By simply using LabVIEW the way it is meant to run I
was able to completely remove the sequence structure and also eliminate the use
of all of the local variables, all while having the exact same execution order.
It could be that the local variables were causing the memory leak that you
noticed, but I really doubt they could be the cause of such a large leak.
I really think there is probably something else going on in the application
because from what I saw from this bit of code there really is no way that it
would have such large problems. Users use the FP commands daily without
any problems, so most likely these are not the root of the problem.
Go ahead and try the modified code and see if you can implement similar local
and global variable reducing techniques throughout your application.
Hopefully that will help reduce some of the memory leaks you are seeing.
Typically the largest cause of an apparent memory leak really occurs from
building an array within a loop, so make sure you don't have any situations
where that occurs in your code either.
Regards,
Otis
Training and Certification
Product Support Engineer
National Instruments
Attachments:
724727-FPAI100_meas_voltage.vi 56 KB -
Memory leak with File Write.vi
Hi All,
I am trying to save a big data cluster, which includes images, into a data log file. The vis I use are: New File.vi, Write File.vi, Close File.vi.
The problem is Write File.vi has memory leak when the data cluster includes images .
Anyone sees similar case? Any solution?
Thanks.
AiqiuAiqiu,
I am glad you found out about flattening your image to a string. I was about to post and say that you probably didn't want to save the IMAQ image reference to a file, because after you closed the image in memory, there wouldn't be anything for the IMAQ image reference to point to. You are correct to flatten the image to a string. Below is a link to a document which discusses doing this to communicate over datasocket, but the processes of flattening the image to a string is the same regardless of whether or not you are sending the image across a datasocket connection or saving to a file.
Transfering Images with DataSocket
As for the memory leak. I am pretty sure that if you passed all of the IMAQ Image references created in the "Image Init Buffer.vi" subVI and then closed each reference individually, that the memory leak would probably go away.
Lorne Hengst
Application Engineer
National Instruments -
Memory Leak with Oracle ODBC Driver for Long Raw columns
Oracle version : 8.1.7
Platform : Win2K
Oracle ODBC Driver version : 8.0.1.7.5.0.0
Hi,
I've got an Oracle database upgraded from
V8.0.5 to V8.1.7 which has a table having one long raw +
normal columns. I was able to observe distinct memory
leaks (approx 80K) when using ODBC interface calls (thro C++ code) that referenced a combination of normal & long raw columns in a select statement. However, this leak was not observed when only normal columns were present in the
select statement. Is there any known restriction for using
long raw columns with other columns? Or do long raw columns have a known memory leak problem thro ODBC?
Thanks!
Regards
SanchayanDid you ever get an answer on this issue?
Thanks in advance -
Memory Leak with cloneModelFromCastMember()?
Hello Experts!
I have been experiencing an apparent memory leak within
Director 11 when
using cloneModelFromCastMember().
I was making the assumption that calling resetWorld() on a
w3D member
onBeginSprite() would garbage collect any models previously
cloned into that
when I previously ran the movie.
However, if I repeatedly start and stop the movie Director
Gobbles roughly
10Mb more memory each time. The memory usage does not reduce
upon calling
resetWorld()
A good way to replicate this is to use
cloneModelFromCastMember() on a
largeish model in a repeat with i = 1 to 50 loop on the on
beginSprite
handler.
Start and stop the movie over and over to see Director's
memory usage hike
up.
Anybody have any advice why this is happening? Do I need to
explicitly
delete all models cloned into a member on stopMovie????
Cheers
Richard SmithHi Zzzorro,
Thanks for the advice!
Why does cloning from external w3D members help? Does it
avoid the memory
leak? It never used to happen on Director 8.5 so it has to be
a new Version
10 / 11 bug right?
I need to import several weightmapped boned characters into a
3D member, and
due to export issues each character has to have it's own w3D
file.
So I have to perform cloning at runtime to build the world. I
also need to
clone these characters based on the level, so I can't use
just one single 3D
member for both these reasons.
Thanks for any further ideas.
Richard Smith
"zzzorro" <[email protected]> wrote in
message
news:gd4sn2$2l8$[email protected]..
> as a rule of thumb:
> whenever possible avoid cloneModelFromCastMember in the
first place.
> It is highly unrecommended and the intel engineers
always recommended to
> use
> loadFile() with an external w3d file, which is much
better than having the
> w3d
> file in the castlib and using cmfcm.
> each cmfm rebuilds the whole scene and takes a lot of
time the bigger the
> scene is.
> apart from glitches like leaks, which you found right
now and other
> things.
>
> I work very much with sw3d and I barely have more than
one shockwave3d
> member
> in any of my movies. in very rare cases I use 2 sw3d
members. Other than
> that I
> use one member where I build and load everything into
from external w3d
> files
> with loadFile(), which is much more appropriate. the
only downside is that
> I
> can't change the model name, but there are ways to deal
with it.
>
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