Possible memory leaks with WL 6.1 SP1?
Hi,
I'm developing an application using WL 6.1 SP1 on NT/2000 (and my client is using
an AIX server).
Running "load tests" (-> only one client wich creates lot of records) and monitoring
the process using the console I can see that the memory usage grows steadly (also
when the client does nothing!) until a point where the server goes OutOfMemory (e.g.
after 60'000 records).
I tried to analyze the problem using OptimizeIt, and I can during our businessServices
lots of object are generated but after a (forced) GC they are no more there.
I've tried using this command-line options:
-ms128m -mx128m
or
-classic -ms128m -mx128m
or
-server -ms128m -mx128m
or
-server -ms128m -mx128m -XX:MaxPermSize=64m
What could I do?
Should I tried to use JDK 1.3.1_04 (now JDK 1.3.1_b24)?
Thanks a lot for your help.
Patrick
"Patrick Herber" <[email protected]> wrote:
>
Thanks a lot for your suggestion: where can I download the SP3? (I've searched
it
but I'ven't found it)
Thanks a lot and have a nice day
Patrick
Rajesh Mirchandani <[email protected]> wrote:
Upgrade to SP3.
Patrick Herber wrote:
Hi,
I'm developing an application using WL 6.1 SP1 on NT/2000 (and my clientis using
an AIX server).
Running "load tests" (-> only one client wich creates lot of records)and monitoring
the process using the console I can see that the memory usage grows steadly(also
when the client does nothing!) until a point where the server goes OutOfMemory(e.g.
after 60'000 records).
I tried to analyze the problem using OptimizeIt, and I can during ourbusinessServices
lots of object are generated but after a (forced) GC they are no morethere.
I've tried using this command-line options:
-ms128m -mx128m
or
-classic -ms128m -mx128m
or
-server -ms128m -mx128m
or
-server -ms128m -mx128m -XX:MaxPermSize=64m
What could I do?
Should I tried to use JDK 1.3.1_04 (now JDK 1.3.1_b24)?
Thanks a lot for your help.
Patrick
Thanks I've found it...
Bye
Patrick
Rajesh Mirchandani
Developer Relations Engineer
BEA Support
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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() {
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public void actionPerformed(ActionEvent e) {
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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"};
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String result = null;
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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;
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frame.pack();
frame.setVisible(true);
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javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
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@Override
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System.out.println(e.getActionCommand());
item2.setActionCommand("Delete");
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super();
init();
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jbInit();
protected void closeIt() {
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pnl.setLayout(new BorderLayout());
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@Override
public void windowClosed(WindowEvent e) {}
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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) {}
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c.removePropertyChangeListener(l);
if (c instanceof JMenuItem) {
ActionListener [] al = ((JMenuItem)c).getActionListeners();
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((JMenuItem)c).removeActionListener(l);
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protected long id;
protected String Employee;
protected String Rep;
protected String Asst;
protected String Client;
protected String Dates;
protected String Status;
protected String Home;
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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;
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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 "+";
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As a hackish workaround you can try this in you FrmReferrals#uninit():
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field.set(listener, null);
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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);
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I'm using a plug-in for Eclipse to help identify possible memory leaks however we are having trouble interpreting the results. The top, and pretty much the only, suspect is this...
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I think I have found a memory leak in e4x.
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The little test program connects to a web server for an xml
file, and the result is converted to an array.
The array is displayed in a DataGrid.
There are two files:
leaktest.xml doesn't leak in any cases (format: e4x or xml)
pbentries.xml leaks when the format is e4x.
Choose e4x format and check Use "Leak" file! Than the program
leaks.
For the whole test case (mxml file, html file and xml files)
please contact me at
[email protected]
or
[email protected]
and I send a zip file as soon as possible.
Probably there is a bug in my test program. If so than please
send me a feedback.
Thanks,
Lacito
------ For the program cut here ------
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute">
<mx:Script>
<![CDATA[
import mx.managers.PopUpManager;
import mx.core.Application;
import mx.controls.Alert;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;
import mx.rpc.http.mxml.HTTPService;
protected var records_:Array = null;
protected var httpService:HTTPService = null;
[Bindable("recordsChange")]
public function set records(_records:Array):void
this.records_ = _records;
var e:Event = new Event("recordsChange");
dispatchEvent(e);
public function get records():Array
return records_;
protected function getXML():void
var resultFormat:String = cbResultFormat.selectedItem as
String;
var params:Object = new Object();
httpService = new HTTPService();
httpService.concurrency = "single";
httpService.showBusyCursor = true;
var lastIndex:int = url.lastIndexOf("/");
var fileName:String = null;
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// It doesn't leak... :)
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var _url:String = url.substr(0, lastIndex+1) + fileName;
httpService.url = _url;
httpService.resultFormat = resultFormat;
httpService.method = "POST";
httpService.addEventListener(ResultEvent.RESULT,
processResult);
httpService.addEventListener(FaultEvent.FAULT,
processFault);
httpService.send(params);
protected function processResult(e:ResultEvent):void
var resultFormat:String = cbResultFormat.selectedItem as
String;
removeListeners();
if(resultFormat==mx.rpc.http.HTTPService.RESULT_FORMAT_XML)
setArrayFromXMLNode();
else
setArrayFromXML();
destroyHttpService();
// format= "e4x"
protected function setArrayFromXML():void
var xml_:XML = httpService.lastResult as XML;
var ar:Array = new Array();
var x:XML = null;
var xl:XMLList = xml_.phonebookEntries[0].phonebookEntry;
for each(x in xl)
var record:Object = new Object();
var prop:XML = null;
var props:XMLList = x.children();
for each(prop in props)
record[prop.localName()] = prop.toString();
ar.push(record);
records = ar;
// format= "xml"
protected function setArrayFromXMLNode():void
var xml_:XMLNode = httpService.lastResult as XMLNode;
var ar:Array = new Array();
var x:XMLNode = null;
var xl:Array = xml_.lastChild.childNodes;
for each(x in xl)
var record:Object = new Object();
var prop:XMLNode = null;
var props:Array = x.childNodes;
for each(prop in props)
record[prop.localName] = prop.firstChild!=null ?
prop.firstChild.nodeValue : null;
ar.push(record);
records = ar;
protected function destroyHttpService():void
httpService.clearResult(false);
httpService.disconnect();
httpService = null;
protected function processFault(e:FaultEvent):void
removeListeners();
Alert.show(e.fault.faultString, e.fault.faultCode);
destroyHttpService();
protected function removeListeners():void
httpService.removeEventListener(ResultEvent.RESULT,
processResult);
httpService.removeEventListener(FaultEvent.FAULT,
processFault);
protected function collect():void
// Garbage Collection
try
new LocalConnection().connect('foo');
new LocalConnection().connect('foo');
catch(e:*)
]]>
</mx:Script>
<mx:ArrayCollection id="alRecords" source="{records}"
/>
<mx:Label x="10" y="10" text="Result format:"
id="lResultFormat"/>
<mx:ComboBox x="104" y="8" id="cbResultFormat">
<mx:Array>
<mx:String>e4x</mx:String>
<mx:String>xml</mx:String>
</mx:Array>
</mx:ComboBox>
<mx:DataGrid id="dgRecords" x="10" y="36" width="936"
height="437"
dataProvider="{alRecords}"
verticalScrollPolicy="auto"
horizontalScrollPolicy="auto">
</mx:DataGrid>
<mx:Button x="355" y="496" label="Get xml" id="btnGetXML"
click="{getXML();}" />
<mx:Button x="155" y="496" label="GC" id="btnGC"
click="{collect();}" />
<mx:CheckBox x="276" y="10" label="Use
"LEAK" file:" labelPlacement="left"
id="chbUseLeakFile" selected="true"/>
</mx:Application>Hello,
After 3 months (and a new version of flex and flash player)
my test program is still leaking.
If somebody could confirm the leak it would be appreciated.
Thanks,
Lacito
P.S.: I heard that Adobe had donated ActionScript 3 VM to
Mozilla.org. Should I disturb them with my problem? -
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.
> -
Memory leak with multi-threaded environment
When starting an environment with the THREADED_MUTEXED
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Replace line 26:
env = Environment::createEnvironment (Environment::DEFAULT);
with
env = Environment::createEnvironment (Environment::THREADED_MUTEXED);
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with
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Recompile and run the program, and use "top" to see the
size of the process's used memory continually increase
unbounded.
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Memory Leak with GotoAndStop()
I am trying to track down a solution to a memory leak within an embedded video. If I embed a video on the timeline and then run gotoAndStop or gotoAndPlay to a specific frame every time the frame changes it takes in more memory until it crashes at about 1.7GB however if I run a straight play() on the same clip the memory usage remains constant. I have also tried System.gc() as it is an AIR App and have tried unloadAndStop() with the embeded video being loaded into a Loader and neither can reclaim any memory.
I am looking for a a way to resolve the memory leak or another way to be able to rapidly jump to specific frames of video as far as I know this is not possible with external flvs.
Thanks
Davevideo is much like a .gif file. if you start at frame 0 and jump to frame 30 it needs to redraw what it does nt have in frame 30 which means tellign it to start at frame 30 is the same as telling it to get all information from when it last changed which might be frame 27 to complete the frame of what should display on frame 30.
this is why its slow to play backwards. and best to play an flv forward.
what i would suggest if you do not need video persay, would be to use png sequences. but if your videos are long then i suppose it would be a greater advantage to keep it compressed.
what is the quality as well of the video and its size and your frame rate?
You mention that you are creating a 3d view, how is that? do you use more than 1 swf ?
I still think this does not sound like a play head issue, since the video is already compiled. -
Memory leak with CryptGetProvParam
I suspect there is a memory leak in the function CryptGetProvParam. I made a Win32Console app in Visual Studio 2008 to recreate the problem. With the example app running it is possible to use Task Manager to see the memory usage of the .exe steadily increase
over time.
I called the app TestSecurityDescriptorWin32Console. Below I have pasted the contents of TestSecurityDescriptorWin32Console.cpp.
I am looking to verify that the problem is with the CryptGetProvParam function, and if this is the case then to get the bug fixed.
Thank you for any help
// TestSecurityDescriptorWin32Console.cpp : Defines the entry point for the console application.
#include "stdafx.h"
#include <windows.h>
HCRYPTPROV GetContext();
void ModifyCryptProvSecurity(HCRYPTPROV hProv);
int _tmain(int argc, _TCHAR* argv[])
DWORD dwSDLen = 0;
HCRYPTPROV hProv = GetContext();
// get dwSDLen
printf("First CryptGetProvParam: %d\n",CryptGetProvParam(hProv,PP_KEYSET_SEC_DESCR, NULL, &dwSDLen, DACL_SECURITY_INFORMATION));
while (1) {
BYTE* pbSD = (BYTE*)LocalAlloc(LHND,dwSDLen);
PSECURITY_DESCRIPTOR
pSD = (PSECURITY_DESCRIPTOR)pbSD;
InitializeSecurityDescriptor(pSD,SECURITY_DESCRIPTOR_REVISION);
// make pbSD size dwSDLen
printf("Second CryptGetProvParam: %d\n",CryptGetProvParam(hProv,PP_KEYSET_SEC_DESCR, pbSD, &dwSDLen, DACL_SECURITY_INFORMATION));
SECURITY_DESCRIPTOR*
pSecurityDescriptor = (SECURITY_DESCRIPTOR*)pbSD;
if (pSecurityDescriptor->Owner != NULL) FreeSid(pSecurityDescriptor->Owner);
if (pSecurityDescriptor->Group != NULL) FreeSid(pSecurityDescriptor->Group);
if (pSecurityDescriptor->Sacl != NULL) LocalFree(pSecurityDescriptor->Sacl);
if (pSecurityDescriptor->Dacl != NULL) LocalFree(pSecurityDescriptor->Dacl);
LocalFree(pbSD);
Sleep(100);
return 0;
HCRYPTPROV GetContext()
HCRYPTPROV hProv = NULL;
HCRYPTKEY hKey = NULL;
CHAR szPPName[100];
DWORD dwPPNameLen = 100;
CHAR szPPContainer[100];
DWORD dwPPContainerLen = 100;
// Attempt to acquire a handle to the default key container.
if (CryptAcquireContext(
&hProv,
NULL,
MS_DEF_PROV,
PROV_RSA_FULL,
CRYPT_MACHINE_KEYSET))
printf("Opened default key container for crypto usage");
else
// Some sort of error occured...
printf("(Allowable) Error acquiring default key container for crypto usage - ");
// .. try to create default key container.
if(CryptAcquireContext(
&hProv,
NULL,
MS_DEF_PROV,
PROV_RSA_FULL,
CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET))
printf("Created key container for crypto usage");
else
printf("Error Creating key container for crypto usage - ");
return (NULL);
// Get CSP name.
if(CryptGetProvParam(
hProv,
PP_NAME,
(BYTE *)szPPName,
&dwPPNameLen,
0))
printf("Key CSP name is '%s'",szPPName);
else
// Error getting key container name.
printf("Failed to retrieve CSP name - ");
// Get name of key container.
if(CryptGetProvParam(
hProv,
PP_CONTAINER,
(BYTE *)szPPContainer,
&dwPPContainerLen,
0))
printf("Key container provider name is '%s'",szPPContainer);
else
// Error getting key container name.
printf("Failed to retrieve key container name - \n");
return hProv;"BYTE* pbSD = (BYTE*)LocalAlloc(LHND,dwSDLen);"
LHND? It's surprising that this doesn't crash the program. Use LPTR.
More generally, stay away from LocalAlloc/LocalFree, use malloc/new/HeapAlloc. Use LocalAlloc only if the API you're working with specifically requires LocalAlloc, that's rare. -
Possible memory leak in TagFileTagInfo class
Hello,
Our application is experiencing a memory leak in Weblogic, which is not happening in other application servers.
We are running Weblogic server 10.3 using the distributed jsf 1.2
Eclipse Memory Analyzer clearly points to TagFileTagInfo class as retaining a Map which holds all the memory. Furthermore, it shows that said map (called _tagFileInfoMap) is holding FileTagFileInfo class instances.
It could be possible that our application were doing something wrong, and that would cause the described behavior, however I doubt that as the other application servers where our application is deployed do not present this problem.
Any suggestion on how we should proceed to fix this problem?
Thanks
JuanHi,
Was this issue resolved by using wlappc?
Were you able to compile the tag files with wlappc? I tried compiling the jsps using wlappc, but it seems that the tool expects an ejb-jar file.
Any help on this is greatly appreciated.
Thanks
Hareesh -
[Bug?] X-Control Memory Leak with Large Data Array
[LV2009]
[Cross-posted to LAVA]
I have found that if I pass a large data array (~4MB in this example) into an X-Control, it causes massive memory allocations (1 GB+).
Is this a known issue?
The X-Control in the video was created, then the Data.ctl was changed to 2D Array - it has not been edited in any other way.
I also compare the allocations to that of a native 2D Array (which is only ~4MB).
Note: I jiggled the Windows Task Manager about so that JING would update correctly, its a bit slow, but it essentially just keeps rolling up and doesn't stop.
Demo code attached.
Cheers
-JG
Unable to display content. Adobe Flash is required.
Certified LabVIEW Architect * LabVIEW Champion
Attachments:
X Control Bug [LV2009].zip 42 KBHi Jon (cool name)
Thank you very much for your reply. We came to this conclusion in the cross post and it is good to have it confirmed by LabVIEW R&D. Your response is also similar to that of my AE which I got this morning as well - see below:
Note: Your reference number is included in the Subject field of this
message. It is very important that you do not remove or modify this
reference number, or your message may be returned to you.
Hi Jon,
You probably found some information from the forum. The US engineer has gotten back and he said that unfortunately that's expected behaviour after they have conducted some tests and this is what he replied:
"X Controls in the background use events structures. In particular the Data Change Event is called when the value of the XControl changes (writing to the terminal, local variable, or value change property). What is happening in this case is the XControl is getting called to fast with a large set of data that the event structure is queuing the events and data that a memory leak is produced. It is, unfortunately, expect behavior. The main work around for the customer in this case is not call the XControl as often. Another possibility is to use the Synchronous Display Property to defer updates to the Xcontrol, this might slow down a leak."
He would also like to know if you can provide with more details how you are using the Xcontrol, perhaps there is a better way. Please refer to the link below for synchronous display. Thank you.
http://zone.ni.com/reference/en-XX/help/371361G-01/lvprop/control_synchronous_display/
In my application I updated the X-Control @ 1Hz and it allocated at MBs/s up to 1+GB before it crashed, all within a few hours. That is why I called it a leak. I am really worried that if this CAR gets killed, there will still be an issue lingering that makes using X-Controls a major problem under the above conditions. I have had to pull two sets of libraries from my code because of this - when they got replaced with native LabVIEW controls the leak when away (but I lost reuse and encapsulation etc...).
Anyways, I really want to use X-Control tho (now and in the future) as I like all other aspect of them. If you do not consider this a leak, can a different #CAR be raised that may modify the existing behavior? I offer the suggestion (in the cross-post) that the data be ignored rather than queued? Similar to Christian's idea, but for X-Controls. Maybe as an option?
I look forward to discussing this with you further.
Regards
-Jon
Certified LabVIEW Architect * LabVIEW Champion -
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. -
Possible memory leak in JSF � help needed
Hi,
We are developing a JSF application using the following:
SUN JSF 1.1_02-b08
Tomahawk 1.1.3
Tomcat 5.5
Our application includes pages with lists; these lists are held and extracted from backing beans.
We are using these beans in request scope with <t:saveState> tag (to avoid holding the lists in the session all the time).
We tested the application using JProbe and found out that each bean that was used in the saveState was added to the view (to the session) , each time we entered the page , and the bean was not released until the end of the session (instead of only one instance of the backing bean).
After I found this problem, I added the following context params to the web.xml:
com.sun.faces.NUMBER_OF_VIEWS_IN_SESSION = 1 (instead of the default 15)
com.sun.faces.NUMBER_OF_VIEWS_IN_LOGICAL_VIEW_IN_SESSION = 1 (instead of the default 15)
We tested the application again, and now no unnecessary instances of the beans were held in the session (in the view).
BUT , now when we use the browser �Back� button, and returning to a page with a list, when selecting an item from the list, no action is performed (the list in the server side does not exist).
My questions are:
1)What is the meaning (difference) of each of the context param : NUMBER_OF_VIEWS_IN_SESSION , NUMBER_OF_VIEWS_IN_LOGICAL_VIEW_IN_SESSION
2)What are the recommended values for these parameters, to minimize session memory, and to enable the usage of the browser �Back� button.
Thank you all,
Lior.Me too.
Please somebody knows how can we avoid memory leak problems in JSF 1.1 ?
Thansk in advanced
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