Garbage collection - setStyle should be removed?
i've list-based components. when i no longer require them, i just use removeChild() method. i've applied setStyle() method to them. i'm a bit consufed, do i really need to use clearStyle() method or without doing it, flash will take them in garbage collection??
I'd say do whatever you can with styles. I'm not sure how much GC-enabling clearing does, but also set the styleNAme to null. However, I'd think that styles like color, fontSize and the like wouldn't create memory leaks. Not sure about skinds (if you use them).
Are you running into some significant memory leaks, or just trying to be as clean as you can be?
To state what might already be known, two of the primary concerns for making your ojbects eligible for GC are to:
After you remove visual objects from the display list, nullify your object reference
For any event listeners you added to your objects, be sure to call removeEventListener for all of them
That is just the basics, though, and I can't do this topic justice compared to the number of good articles you can find online by searching for this subject:
http://lmgtfy.com/?q=as3+garbage+collection
Similar Messages
-
I can't seem to remove / unload the external swf files e.g when the carousel.swf (portfolio) is displayed and I press the about button the about content is overlapping the carousel (portfolio) . How can I remove / unload an external swf file from the main flash file and load a new swf file, while at the same time removing garbage collection from memory?
This is the error message(s) I am receiving: "TypeError: Error #2007: Parameter child must be non-null.
at flash.display::DisplayObjectContainer/removeChild()
at index_fla::MainTimeline/Down3()"
import nl.demonsters.debugger.MonsterDebugger;
var d:MonsterDebugger=new MonsterDebugger(this);
stage.scaleMode=StageScaleMode.NO_SCALE;
stage.align=StageAlign.TOP_LEFT;
stage.addEventListener(Event.RESIZE, resizeHandler);
// loader is the loader for portfolio page swf
var loader:Loader;
var loader2:Loader;
var loader3:Loader;
var loader1:Loader;
// resize content
function resizeHandler(event:Event):void {
// resizes portfolio page to center
loader.x = (stage.stageWidth - loader.width) * .5;
loader.y = (stage.stageHeight - loader.height) * .5;
// resizes about page to center
loader3.x = (stage.stageWidth - 482) * .5 - 260;
loader3.y = (stage.stageHeight - 492) * .5 - 140;
/*loader2.x = (stage.stageWidth - 658.65) * .5;
loader2.y = (stage.stageHeight - 551.45) * .5;*/
addEventListener(Event.ENTER_FRAME, onEnterFrame,false, 0, true);
function onEnterFrame(ev:Event):void {
var requesterb:URLRequest=new URLRequest("carouselLoader.swf");
loader = null;
loader = new Loader();
loader.name ="carousel1"
//adds gallery.swf to stage at begining of movie
loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader.load(requesterb);
} catch (error:SecurityError) {
trace(error);
addChild(loader);
loader.x = (stage.stageWidth - 739) * .5;
loader.y = (stage.stageHeight - 500) * .5;
// stop gallery.swf from duplication over and over again on enter frame
removeEventListener(Event.ENTER_FRAME, onEnterFrame);
//PORTFOLIO BUTTON
//adds eventlistner so that gallery.swf can be loaded
MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
function Down(event:MouseEvent):void {
// re adds listener for contact.swf and about.swf
MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
//unloads gallery.swf from enter frame if users presses portfolio button in nav
var requester:URLRequest=new URLRequest("carouselLoader.swf");
loader = null;
loader = new Loader();
loader.name ="carousel"
loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader.load(requester);
} catch (error:SecurityError) {
trace(error);
addChild(loader);
loader.x = (stage.stageWidth - 739) * .5;
loader.y = (stage.stageHeight - 500) * .5;
removeChild( getChildByName("about") );
removeChild( getChildByName("carousel1") );
// remove eventlistner and prevents duplication of gallery.swf
MovieClip(root).nav.portfolio.removeEventListener(MouseEvent.MOUSE_DOWN, Down);
//INFORMATION BUTTON
//adds eventlistner so that info.swf can be loaded
MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
function Down1(event:MouseEvent):void {
//this re-adds the EventListener for portfolio so that end user can view again if they wish.
MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
var requester:URLRequest=new URLRequest("contactLoader.swf");
loader2 = null;
loader2 = new Loader();
loader2.name ="contact"
loader2.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader2.load(requester);
} catch (error:SecurityError) {
trace(error);
addChild(loader2);
loader2.x = (stage.stageWidth - 658.65) * .5;
loader2.y = (stage.stageHeight - 551.45) * .5;
// remove eventlistner and prevents duplication of info.swf
MovieClip(root).nav.info.removeEventListener(MouseEvent.MOUSE_DOWN, Down1);
//ABOUT BUTTON
//adds eventlistner so that info.swf can be loaded
MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
function Down3(event:MouseEvent):void {
//this re-adds the EventListener for portfolio so that end user can view again if they wish.
MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
var requester:URLRequest=new URLRequest("aboutLoader.swf");
loader3 = null;
loader3 = new Loader();
loader3.name ="about"
loader3.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader3.load(requester);
} catch (error:SecurityError) {
trace(error);
addChild(loader3);
loader3.x = (stage.stageWidth - 482) * .5 - 260;
loader3.y = (stage.stageHeight - 492) * .5 - 140;
removeChild( getChildByName("carousel") );
removeChild( getChildByName("carousel1") );
// remove eventlistner and prevents duplication of info.swf
MovieClip(root).nav.about.removeEventListener(MouseEvent.MOUSE_DOWN, Down3);
stop();Andrei1,
Thank you for the helpful advice. I made the changes as you suggested but I am receiving a #1009 error message even though my site is working the way I wan it to work. I would still like to fix the errors so that my site runs and error free. This is the error I am receiving:
"TypeError: Error #1009: Cannot access a property or method of a null object reference."
I'm sure this is not the best method to unload loaders and I am guessing this is why I am receiving the following error message.
loader.unload();
loader2.unload();
loader3.unload();
I also tried creating a function to unload the loader but received the same error message and my portfolio swf was not showing at all.
function killLoad():void{
try { loader.close(); loader2.close; loader3.close;} catch (e:*) {}
loader.unload(); loader2.unload(); loader3.unload();
I have a question regarding suggestion you made to set Mouse Event to "null". What does this do setting the MouseEvent do exactly? Also, since I've set the MouseEvent to null do I also have to set the loader to null? e.g.
---- Here is my updated code ----
// variable for external loaders
var loader:Loader;
var loader1:Loader;
var loader2:Loader;
var loader3:Loader;
// makes borders resize with browser size
function resizeHandler(event:Event):void {
// resizes portfolio page to center
loader.x = (stage.stageWidth - loader.width) * .5;
loader.y = (stage.stageHeight - loader.height) * .5;
// resizes about page to center
loader3.x = (stage.stageWidth - 482) * .5 - 260;
loader3.y = (stage.stageHeight - 492) * .5 - 140;
//adds gallery.swf to stage at begining of moviie
Down();
//PORTFOLIO BUTTON
//adds eventlistner so that gallery.swf can be loaded
MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
function Down(event:MouseEvent = null):void {
// re adds listener for contact.swf and about.swf
MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
//unloads gallery.swf from enter frame if users presses portfolio button in nav
var requester:URLRequest=new URLRequest("carouselLoader.swf");
loader = new Loader();
loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader.load(requester);
} catch (error:SecurityError) {
trace(error);
this.addChild(loader);
loader.x = (stage.stageWidth - 739) * .5;
loader.y = (stage.stageHeight - 500) * .5;
// sure this is not the best way to do this - but it is unload external swfs
loader.unload();
loader2.unload();
loader3.unload();
// remove eventlistner and prevents duplication of gallery.swf
MovieClip(root).nav.portfolio.removeEventListener(MouseEvent.MOUSE_DOWN, Down);
//INFORMATION BUTTON
//adds eventlistner so that info.swf can be loaded
MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
function Down1(event:MouseEvent = null):void {
//this re-adds the EventListener for portfolio so that end user can view again if they wish.
MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
var requester:URLRequest=new URLRequest("contactLoader.swf");
loader2 = null;
loader2 = new Loader();
loader2.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader2.load(requester);
} catch (error:SecurityError) {
trace(error);
addChild(loader2);
loader2.x = (stage.stageWidth - 658.65) * .5;
loader2.y = (stage.stageHeight - 551.45) * .5;
loader.unload();
loader2.unload();
loader3.unload();
// remove eventlistner and prevents duplication of info.swf
MovieClip(root).nav.info.removeEventListener(MouseEvent.MOUSE_DOWN, Down1);
//ABOUT BUTTON
//adds eventlistner so that info.swf can be loaded
MovieClip(root).nav.about.addEventListener(MouseEvent.MOUSE_DOWN, Down3, false, 0, true);
function Down3(event:MouseEvent = null):void {
//this re-adds the EventListener for portfolio so that end user can view again if they wish.
MovieClip(root).nav.portfolio.addEventListener(MouseEvent.MOUSE_DOWN, Down, false, 0, true);
MovieClip(root).nav.info.addEventListener(MouseEvent.MOUSE_DOWN, Down1, false, 0, true);
var requester:URLRequest=new URLRequest("aboutLoader.swf");
loader3 = null;
loader3 = new Loader();
loader3.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
function ioError(event:IOErrorEvent):void {
trace(event);
try {
loader3.load(requester);
} catch (error:SecurityError) {
trace(error);
addChild(loader3);
loader3.x = (stage.stageWidth - 482) * .5 - 260;
loader3.y = (stage.stageHeight - 492) * .5 - 140;
loader.unload();
loader2.unload();
loader3.unload();
// remove eventlistner and prevents duplication of info.swf
MovieClip(root).nav.about.removeEventListener(MouseEvent.MOUSE_DOWN, Down3);
stop(); -
IncompatibleClassChangeError. Caused by garbage collection?
The problem occurs on JDK 1.3.1-b24 compiled in JBuilder Windows and
running on Sun Solaris with identical JDK version.
The application is a relatively complex RMI server.
An error recovery function in the server runs in a Thread every two
minutes. Most of the time it has nothing to do and ends without
incident.
Occasionally conditions require recovery that may not be successful
for many attempts.
Part of the recovery is a simple debug display of parameters involved
in the recovery. There will be multiple displays during a single
recovery cycle.
In a recent example of problem, the recovery executed every two
minutes for over two hours with the debug display working
successfully.
Suddenly one display works successfully and 5 milliseconds later the
same display fails with a IncompatibleClassChangeError.
The last part of the stack trace is:
java.lang.IncompatibleClassChangeError
at [class name].toString([class name].java:74)
at java.lang.String.valueOf(String.java:1947)
at java.lang.StringBuffer.append(StringBuffer.java:370)
at java.util.AbstractMap.toString(AbstractMap.java:567)
at java.lang.String.valueOf(String.java:1947)
line 74 of class is
public String toString()
return _responses.toString();
where _responses is an ArrayList that has been stored on Map that
contains the parameters that is being display as part of the debug
information.
Once the failure occurs, it will always occur until the JVM is
restarted. This suggests to me that something in the JVM, maybe garbage collection, has either corrupted the in-memory copy of the class or some internal table used by the JVM has become corrupted.
Anybody else have ideas?java.lang.IncompatibleClassChangeError
at [class name].toString([class name].java:74)
at java.lang.String.valueOf(String.java:1947)
at
java.lang.StringBuffer.append(StringBuffer.java:370)
at
java.util.AbstractMap.toString(AbstractMap.java:567)
at java.lang.String.valueOf(String.java:1947)
Problem: The IncompatiableClassChangeError is a Symbolic resolution problem. In lamen's terms a package,class,method,or a variable name is corrupted.
Possible problem location: Are you using a Custom ClassLoader? Do you Load and compile on the fly?
where _responses is an ArrayList that has been stored
on Map that
I would look hard at the following methods in your MAP Interface:
public void clear();
public Object put(Object key,Object value);
public void putAll(Map t);
public Object remove(Object key);Is it possible that your MAP interface is corrupting your ArrayList using one of the above methods? Then, when you are building the strings using the AbstractMap's.toString() method, you are getting the IncompatiableClassChangeError?
This is word for word listing of the MAP Interface...V1.41.
Some map implementations have restrictions on the keys and values they may contain. For example, some implementations prohibit null keys and values, and some have restrictions on the types of their keys.
This puzzles me
Attempting to insert an ineligible key or value throws an unchecked exception, typically NullPointerException or ClassCastException.
What's this, they state above that you should get a unchecked Exception, but the first sentence below makes me assume they are pulling a query on an ineligible key or value???
Attempting to query the presence of an ineligible key or value may throw an exception, or it may simply return false; some implementations will exhibit the former behavior and some will exhibit the latter.
Oh,OK. They are basically saying it totally depends on how you implement this Interface <grin>
More generally, attempting an operation on an ineligible key or value whose completion would not result in the insertion of an ineligible element into the map may throw an exception or it may succeed, at the option of the implementation.
The "optional" they are talking about are the methods that I listed above.
Such exceptions are marked as "optional" in the specification for this interface.
Well you asked for ideas, so there's a brain fart for you?
...Hope this helps -
I don't understand if it is my responsibility to remove every listeners associated to a variable, before I set it to null.
JTable aTable = new JTable( new SomeTableModel() );
aTable = new JTable( new SomeTableModel() );Even if this example isn't very correct, as I should have done setModel on the variable, should I remove the listeners from aTable before the last statement?
In other words, should one put special care before loose a reference to a complex component?
Actually, the setModel method in JTable.java removes the old listeners, suggesting to do the same in my example.
I don't remeber where I read that Sun put a new method into one of the last jdk releases, to obtain the List of listeners.
Thanks
EnricoWell, yes and no.
It is good practice to remove listeners but it is not nessecary.
The garbage collector in your case will after a unknown time notice that your program are not referencing the JTable at the moment and with that, also the table model and all other components are unreferenced from your program (read thread). Altough the JTable and table model might still reference your program, it should not care.
You might be careful thou if you for instance have an updater-thread running that slowly populates the model. If that thread is not removed, it will be referencing the table, and therefor neither thread, table or tablemodel will be garbage collected.
Regards,
Peter Norell -
Find out references to objects (garbage collection)
Is there an easy way to find out, which references prevent the garbage collector from collecting my old objects, which I expect should be collected? Something like System.out.println(...)
if you just want an object to be garbage collected, just
make sure you de-reference is completely.CMueller obviously doesn't know which references prevent garbage collection so naturally he cannot set those references to null, now can he?
o = null; // sets the value to null and drops all the referencesThat is simply not true. Removing a reference to an object doesn't affect any other references to that object.
Object o1,o2;
//create an object and make o1 reference it
o1=new Object();
//make o2 reference the same object as o1 references
o2=o1;
//now there are two references to the object
//make o1 reference null
o1=null;
//at this point there is still one reference (o2) to
//the object and therefore the object is NOT garbage
//which means that it can NOT be collected by the GC- Marcus Sundman -
A question about JNI references, persistence, and garbage collection
I am writing a library to allow our Java developers to access C functions in our product. I want people on the Java side to be able to instantiate instances of a new object (on the C side), say "Map", and I want those objects to persist until they are destroyed on the Java side. I am thinking of creating a wrapper for the native methods, which stores an identifier for the instance of an object. When the C object is accessed, the identifier is passed to the C code which looks up the correct object in a table. I understand that if I use the NewGlobalReference call in JNI I can get objects to persist.
When it is time for garbage collection I plan to override finalize() to call the C code and tell it to remove the Global Reference.
Here's what I have in mind
public class JMap() {
private static int id;
static {
System.loadLibrary("libMap");
/*Call C method which instantiates object and creates a GlobalReference
which is stored in table. Returns ID for reference*/
id = _init();
public void setSize(int x, int y) {
_setSize(id, x, y);
public void finalize() {
_finalize(id);
super.finalize();
private native int _init();
/*calls DeleteGlobalReference for the reference matching this id*/
private native void _finalize(int id);
private native void _setSize(int id, int x, int y);
}Is this the right thing to do? Have I understood the way JNI works with regard to GlobalReferences?
Any comments, tips or pointers would be appreciated :)This probably should have been posted in the Native Methods sub-forum, I have reposted there:
http://forum.java.sun.com/thread.jspa?threadID=657667
Mods please delete this post :) -
Nested object reference after garbage collection
I have a question about how GC works.
Assume I have a Class A which has a reference to class B inside it. I create a object of class B and assign to member variable of class A.
Now when obja is no longer needed, I set it null. And when GC runs, the object will be removed from memory. But should I also need to explicitly set objb to null. If i don't set it, will it also get garbage collected when obja is being removed from memory?
public class ClassA {
private ClassB objB = new ClassB();
private static void main(String args[]) {
ClassA obja = new ClassA();
obja = null;
}801625 wrote:
But should I also need to explicitly set objb to null.No.
If i don't set it, will it also get garbage collected when obja is being removed from memory?If there are no other references outside of classA to the object referenced by objB (in your case an instance of ClassB) then it will be garbage collected.
Note - the only time one needs to set a reference to null is if one wants the object it references to be eligible for GC before the reference goes out of scope. There is a slight complication to this - depending on the JVM implementation, if a reference is defined in a block internal to a method then even though it goes out of scope when execution goes out of the block anything it references may not be eligible for GC until the method exits. -
Animation gets slow when program needs a Garbage Collect.
So nonetheless, I should probably develop a new animation algorithm, yes?
I am looping through a seperate thread that calls the setSize() methods a bunch of times. Works really nice when memory isnt bad, but when I need to garbage collect, and apparantly java doesnt agree, it gets really slow. Later one is really able to see when a GC is actually done, and it goes back to normal.
Here is my algorithm,
public static boolean raisePanel(final VCMSComponentFrame p, final boolean anim)
if (p.getState() == VCMSComponentFrame.State.RAISED ||
p.getState() == VCMSComponentFrame.State.ANIMATING)
return false;
new Thread(new Runnable()
public void run()
p.setState(VCMSComponentFrame.State.ANIMATING);
if (anim)
for (int i = p.getHeight(); i <= FULL_PANEL_HEIGHT; i++)
try
p.setSize(p.getWidth(), i);
JComponent parent = (JComponent)p.getParent();
int index = findIndex(p);
for (int j = index + 1; j < parent.getComponentCount() && j != 0; j++)
parent.getComponent(j).setLocation(parent.getComponent(j).getX(), parent.getComponent(j).getY() + 1);
//Viewport Panel
parent.setSize(parent.getWidth(), parent.getHeight() + 1);
//Structure Frame
VCMSStructurePanel panel = (VCMSStructurePanel)parent.getParent();
parent.getParent().setSize(panel.getWidth(), panel.getHeight() + 1);
//Structure Siblings.
JPanel master = (JPanel)panel.getParent();
index = findStructureIndex(panel);
for (int j = index + 1; j < master.getComponentCount() && j != 0; j++)
master.getComponent(j).setLocation(master.getComponent(j).getX(), master.getComponent(j).getY() + 1);
Thread.sleep(1);
catch (Exception ex)
else
p.setSize(p.getWidth(), FULL_PANEL_HEIGHT);
JPanel parent = (JPanel)p.getParent();
int index = findIndex(p);
//Viewport Panel
parent.setSize(parent.getWidth(), parent.getHeight() + FULL_PANEL_HEIGHT - SHORT_PANEL_HEIGHT);
//Structure Frame
VCMSStructurePanel panel = (VCMSStructurePanel)parent.getParent();
parent.getParent().setSize(panel.getWidth(), panel.getHeight() + FULL_PANEL_HEIGHT - SHORT_PANEL_HEIGHT);
//Component Siblings
for (int j = index + 1; j < parent.getComponentCount() && j != 0; j++)
parent.getComponent(j).setLocation((int)parent.getComponents()[j].getLocation().getX(), (int)parent.getComponents()[j].getLocation().getY() + FULL_PANEL_HEIGHT - SHORT_PANEL_HEIGHT);
//Structure Grandparent
JPanel master = (JPanel)panel.getParent();
index = findStructureIndex(panel);
for (int j = index + 1; j < master.getComponentCount() && j != 0; j++)
master.getComponent(j).setLocation((int)master.getComponent(j).getLocation().getX(), (int)master.getComponent(j).getLocation().getY() + FULL_PANEL_HEIGHT - SHORT_PANEL_HEIGHT);
p.setState(VCMSComponentFrame.State.RAISED);
}).start();
//System.gc();
return true;
}any help appreciated!sierratech wrote:
Only a guess, but this may have something to do with Threads and Swing.
http://java.sun.com/products/jfc/tsc/articles/threads/threads1.html.
Many Swing updates should be called in the Event Dispatch thread, and it looks like you may be calling some of these in your new Thread.
Try using SwingUtilities.invokeLater() and see if that helps. Alternatively, rewrite your code to remove the Thread and do everything in the event Dispatch thread using javax.swing.Timer. Again, just a guessThanks for the Idea, but this option doesnt even show the animation.
One Idea I got from a "Swing Hacks" directory works like this:
Remove the components for animation.
Create an image of the components.
Overide the Paint method.
Animate the images via paint method.
Remove the images.
Add back the components.
But I look at that and my stomach cringes.
Any other Ideas? -
Why can we force Garbage Collection
Hello,
Why can we force garbage collection since we have AUTOMATIC garbage collection?If you don't call dispose on the Window, it may keep a
GUI thread running in the background. Since this
thread is still running and accesible from the root,
it will hold onto the Window. You should always call
dipose() on Windows you want to be completely removed.I know I should that's why a mentioned it! But is it correct that I should have to? Nowhere in the documentation does it say so. The fundamental principle is you let go of all object references and eventually the object will be removed by the GC. In this case this important principle is broken.
At least a clear WARNING should be stated. Window (and all its subclasses) break an important principle of Java. If you don't call dispose your program will leak memory !!! -
[JS] $.gc() - garbage collection, etc.
Hello everyone, bear with me for all the questions.
$.gc() - Initiates garbage collection in the JavaScript engine.
Ok, maybe I have a fundamental misunderstanding of things here, but I am wanting to understand a few things:
I was wanting to know if $.gc() can be called and executed outside of running scripts directly from with in the ESTK toolkit? The reason I ask is that its listed in the tools guide but not the javascript reference. I know things like $.writeln() only seem to apply/display from with in the ETSK toolkit, is it still executed otherwise silently when it appears in a script, $.sleep() works fine when used. So what about $.gc(), can I call it and have it execute from within my scripts outside of running them via the ETSK toolkit?
Is there a way to test if its in fact being called, executed, working? I have seen people talking about calling it twice and doubling up, $.gc() $.gc(), thus does it even work, or is it just a fabled mythical thing.
Do codes when executed outside the ETSK toolkit get funneled through the same javascript runtime engine that they do when executing from with in the ETSK toolkit? Is it all the same and the ETSK toolkit is just Adobe's GUI for writing, debugging, targeting different api's for the various programs with in the same underlying engine?
Does ScriptBay tap into and use this same underlying framework? Does it do anything inherently on its own for garbage collection? (since it can run scripts sequentially, repetitively, etc..)
Does anyone know what embedded javascript runtime/engine Adobe is using? This would be beneficial for any specific optimizations that can be considered or kept in mind in general based on the specific JS engine thats implemented when coding.
So aside from the mythical $.gc() , what other best practices for garbage collection should be considered? I know people suggest wrapping your codes in a function, talk of #targetengine (saw in InDesign forum), etc… are there any other common do's and dont's, best practices pertaining specifically to illustrator? Granted I can find a lot about Javascript in general across the web but what about how it applies to Illustrator, its api, limitations, performance, garbage collection, etc..
Thanks. ;-)
Again, sorry for all the questions, I am still trying to continue to wrap my head around different aspects of this whole thing. Thanks everyone for any feedback your able to offer and provide. Many thanks in advance, its greatly appreciated. Thanks again.I can't answer or help with all of those… Here are my thoughts… The dollar object properties and functions can be called on by script from AI, BR, ID & PS… They are NOT restricted for use in the ESTK tookit. Yeah $.writeln() would write to the console if the toolkit were open if NOT then it will probably launch it… So remove or comment these out. As you can see from $.sleep() it does what it says when run in the host app. #targetengine is exclusive to ID this app can have multi-instances ( or something like that ). The other apps have 1 engine and thats it. AI's engine is persistent so wrapping your code is good practice I do this for BR & PS too… See…
http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/devnet/pdf/illustrator/scrip ting/readme_cs5.txt
As for garbage collection I've never fould the need to use it… I see some like to set variables back to null but again I don't do this…
You would have been better off asking this question in the ID scripting forum… There are several people there who are better qualified to answer some of this… -
High Eden Java Memory Usage/Garbage Collection
Hi,
I am trying to make sure that my Coldfusion Server is optomised to the max and to find out what is normal limits.
Basically it looks like at times my servers can run slow but it is possible that this is caused by a very old bloated code base.
Jrun can sometimes have very high CPU usage so I purchased Fusion Reactor to see what is going on under the hood.
Here are my current Java settings (running v6u24):
java.args=-server -Xmx4096m -Xms4096m -XX:MaxPermSize=256m -XX:PermSize=256m -Dsun.rmi.dgc.client.gcInterval=600000 -Dsun.rmi.dgc.server.gcInterval=600000 -Dsun.io.useCanonCaches=false -XX:+UseParallelGC -Xbatch ........
With regards Memory, the only memory that seems to be running a lot of Garbage Collection is the Eden Memory Space. It climbs to nearly 1.2GB in total just under every minute at which time it looks like GC kicks in and the usage drops to about 100MB.
Survivor memory grows to about 80-100MB over the space of 10 minutes but drops to 0 after the scheduled full GC runs. Old Gen memory fluctuates between 225MB and 350MB with small steps (~50MB) up or down when full GC runs every 10 minutes.
I had the heap set to 2GB initally in total giving about 600MB to the Eden Space. When I looked at the graphs from Fusion Reactor I could see that there was (minor) Garbage Collection about 2-3 times a minute when the memory usage maxed out the entire 600MB which seemed a high frequency to my untrained eye. I then upped the memory to 4GB in total (~1.2GB auto given to Eden space) to see the difference and saw that GC happened 1-2 times per minute.
Is it normal in Coldfusion that the Eden memory would grow so quickly and have garbage collection run so often? i.e do these graphs look normal?
Also should I somehow redistribute the memory available to give the Eden memory more since it seems to be where all the action is?
Any other advice for performance improvements would be much appreciated.
Note: These graphs are not from a period where jrun had high CPU.
Here are the graphs:
PS Eden Space Graph
PS Survivor Space Graph
PS Old Gen Graph
PS Perm Gen Graph
Heap Memory Graph
Heap/Non Heap Memory Graph
CPU Graph
Request Average Execution Time Graph
Request Activity Graph
Code Cache GraphHi,
>Is it normal in Coldfusion that the Eden memory would grow so quickly and have garbage collection run so often?
Yes normal to garbage collect Eden often. That is a minor garbage collection.
>Also should I somehow redistribute the memory available to give the Eden memory more since it seems to be where all the action is?
Sometimes it is good to set Eden (Eden and its two Survivor Spaces combined make up New or Young Generation part of JVM heap) to a smaller size. I know your thinking - what make it less, but I want to make it bigger. Give less a try (sometimes less = more, bigger not = better) and monitor the situation. I like to use -Xmn switch, some sources say to use other method/s. Perhaps you could try java.args=-server -Xmx4096m -Xms4096m -Xmn172m etc. I better mention make a backup copy of jvm.config before applying changes. Having said that now you know how you can set the size to bigger if you want.
I think the JVM is perhaps making some poor decisions with sizing the heap. With Eden growing to 1Gb then being evacuated not many objects are surviving and therefore not being promoted to Old Generation. This ultimately means the object will need to be loaded again latter to Eden rather than being referenced in the Old generation part of the heap. Adds up to poor performance.
>Any other advice for performance improvements would be much appreciated.
You are using Parallel garbage collector. Perhaps you could enable that to run multi-threaded reducing the time duration of the garbage collections, jvm args ...-XX:+UseParallelGC -XX:ParallelGCThreads=N etc where N = CPU cores (eg quad core = 4).
HTH, Carl. -
URL class is not being garbage collected
I have created two instances of the URL class to specify a file location for each image. I use com.symantec.itools.javax.swing.icons.ImageIcon class to display images specified by each URL instance as icons inside a button. The setImageLocation method(URL location) of the ImageIcon class sets the location to be displayed by this icon. The following is the code snippets used to create the ImageIcon instances:
private URL greenIconURL;
private URL redIconURL;
com.symantec.itools.javax.swing.icons.ImageIcon green_icon = new com.symantec.itools.javax.swing.icons.ImageIcon();
com.symantec.itools.javax.swing.icons.ImageIcon red_icon = new com.symantec.itools.javax.swing.icons.ImageIcon();
try
greenIconURL = new java.net.URL
("file:./images/greenline.gif");
green_icon.setImageLocation(greenIconURL);
catch (java.net.MalformedURLException error) { }
try
redIconURL = new java.net.URL
("file:./images/redline.gif");
red_icon.setImageLocation(redIconURL);
catch (java.net.MalformedURLException error) { }
I am using JProbe 5.0.1 Memory to determine the loitering objects when I remove the button from the JInternalFrame. I am using Java 1.2.2_08 version. The JProbe Memory Leak Doctor indicates that each URL instance has a reference to an entry in a HashMap table. The reference graph from the root set has a reference to SoftCache to HashMap to HashMap$Entry. To make this URL instance eligible for garbage collection, JProbe Memory Leak Doctor indicates I must remove the entry from the HashMap. How do I get access to this HashMap to remove the entry? If this is a problem with the version of the JDK, please let me know. Thank you in advance for your assistance.<root>Statics
-->sun.misc.SoftCache->java.util.HashMap->java.util.Has
Map$Entry[]->java.util.HashMap$Entry->java.net.URL
I do not an instance of HashMap in my class.
Therefore, the HashMap is either created by URLclass
or the
com.symantec.itools.javax.swing.icons.ImageIcon
class.SoftCache seems to have a normal HashMap inside
it/* Hash table mapping keys to ValueCells */
private Map hash;but if that is the HashMap in JProbe
information then the URL would have to be a key in
the map - otherwise there'd be another object in the
chain of class SoftCache.ValueCell
are you certain that the java.net.URL's in that
hashmap are your ones?
out of curiosity - are you certain that the URL's are
the/a problem (are you getting an OutOfMemoryError?)
asjfThe button that contains the URL's is the only one on the JInternalFrame. The JProbe Memory Debugger displays the java.net package name, the URL class name, the count (2), and the Count Change (+2). When I remove the button from the JInternalFrame, the aforementioned numbers on the Instance Summary remain the same. The snapshot of the Java Heap reveals that the two instances of the URL class are still there. The Memory Leak Doctor shows the reference graph from the root set:
<root>Statics->SoftCache->HashMap->HashMap$Entry[]->HashMap$Entry->URL
When I right click on the arrow between HashMap$Entry[] and HashMap$Entry to remove the reference, I receive the message: "Congratulations this object can be garbage collected..." It appears like private instance of Map in SoftCache is holding a strong reference.
I am not getting an OutOfMemoryError exception. -
How to Change the Garbage Collection Algorithm in WLS 9..2
Hi All
I am trying to find out the way to configure the GC algorithm in weblogic 9.2 to type bea.Jmapi.GarbageCollector@.
By default it is showing ‘Nursery, parallel mark, parallel sweep’ . We were trying to change it to generational (two-spaced) with a parallel mark algorithm and a concurrent sweep algorithm or bea.Jmapi.GarbageCollector .
To change the same I modified the memory argument in commenv.cmd to set MEM_ARGS=-Xms128m -Xmx256m -XXsetGC:genparcon
Still Garbage Collection Statistics section in web logic console shows the same default value.
Could anyone tell me if I am missing something?
thanks in advanceThere is nothing is WebLogic that will define the JVM GC algorithm, that is up to the JVM settings that are normally configured using params in the start scripts.
If you are using JRockit, you can ask in the forums but the JVM documentation should really be sufficient.
JRockit
Same thing for the Sun JVM, there is lots of information out there on how to change the GC algorithm.
The thing that is nice about JRockit is that you can use the Mission Control tooling to take recordings, look at the GC's and make adjustments easily. Sun has some tooling as well with jvmstat (and visualgc), but I'm not as familiar with it.
http://java.sun.com/performance/jvmstat/
Both of those tools would be much preferred to printing the GC info to a file and trying to parse it in my opinion. -
SystemManager and Garbage Collection
Hi everyone, I have a question regarding the SystemManager and Garbage Collection. I have and application that loads in its assets via a swc created in Flash. In that swc I have different MovieClips that act as the different screens of my application each one being tied to its own custom class. For example one MovieClip is a login screen another is the main menu etc. These screens contain components, text fields and animations. The problem that I am having is when I move from one screen to the other the garbage collector is not cleaning up everything. There are still references to the MovieClips that have animations for example. So even though I remove the screen via removeChild and set the variable reference to that object to null it is not releasing the MovieClips. When I pull it up in the profiler it shows me that SystemManager is holding references to them. Also if I debug the applicaion and look inside the instance of the MovieClip I can see that the private property "listeners" has values, but I am not adding listeners. It appears that the SystemManager is adding listeners. Does anyone know how I can clear these listeners or force the SystemManager to release these items. Any ideas or help would be greatly appreciated. I am fairly new to dealing with memory management and garbage collection in Flex. I am using Flash CS4 to create the swc and Flash Builder 4 Beta with the 3.4 framework and Flash Player 10 to create the app. If you need me to clarify any of this please let me know. Again any help or ideas on where to go from here would be great!
This chain says that the focusManager is referencing UserMenu. Is there a default button or focusable objects in UserMenu and references from UserMenu to the objects in question?
BTW, the CS4 fl.managers.FocusManager and any fl.. classes are incompatible with Flex, so make sure you're not using them in your MovieClips.
Alex Harui
Flex SDK Developer
Adobe Systems Inc.
Blog: http://blogs.adobe.com/aharui -
We currently have a garbage collection related performance issue that I could do with some advice on.
We use Jakarta Tomcat with an application that has approximately 1300 jsp's. When a new set of jsp's are rolled out we see a degradation in performance. Using jvmstat I've ascertained that this performance degradation is due to excessive garbage collection partulcarly in the young generation where it appears to be almost constantly collecting. What advice would you give?
ie More young generation space? fewer survivor cycles? bigger eden or survivor space?
Any suggestions would be much appreciated.Hi
See
http://java.sun.com/docs/hotspot/gc1.4.2/
http://java.sun.com/docs/hotspot/gc1.4.2/example.html
The steps should be, as in example.html
1. Determine the size u would allocate.
2. Then try the alternate collectors.
1300 jsps, do take note of MaxPermSize too.
Hope this helps.
Maybe you are looking for
-
Which Parts of iPhoto Folder Can I Avoid Backing Up?
Hi, I keep 2 backups of my iPhoto library, the first is at home and is a complete copy of the iPhoto package folder and the second is on a remote NAS. Because backing-up onto the NAS drive using Chronosync is such a slow process (becuase of the no o
-
ChaRM integration with third party tool
Hello, I have some talks withn customers regarding a scenario where Change Requests comes from a third party tool like HP Demand and Portfolio Management. A possible scenario is when there is a request for change which goes for a complex review and
-
I have a license for Adobe X Pro and My computer died how do I install Adobe X Pro and transfer the license to my new computer?
-
Hi, I have to check a condition of a filed in a particular node and if it satisfied need to create the a node in the target with respect to the source node. I tried various combination but ended up in error, please help. Thanks
-
Dear Experts, I am making monthly consumption report, In which i am getting monthly data column wise for different month , here firstly i am fetching header mblnr date according to date from mkpf then i am fetching data from mseg..... I have same mb