Garbage Collection Problem

Hi All,
I am facing some problem with frequent Garbage Collection application running in the background. Issue in production system. Frequently GC is happening, which is affecting the performance. Is there any work around. Issue is affecting the employees and data is inconsistent.
Please help on this asap.
Regards,
Soorya

Hi,
>>>I am facing some problem with frequent Garbage Collection application running in the background.
usually issues with GC are not that simple
also you need to check what kind of GC is happening first then you can start checking why
but my guess would be there is something wrong with the flow and this is causing the GC to work in a wrong way
(if it was working before)
when I did GC checks for my clients it was at least one day of work sometimes to find out what was wrong + repairs later on
Regards,
Michal Krawczyk

Similar Messages

Help needed!! Novice with Garbage Collection problems.

Hi Guys,
Really hoping somebody can help me here. I am a relative novice when it comes to all things Java but i am slowly trying to learn. I have come across an issue which i have identified but i am just not sure what to do about it.
Ok, in a nut shell the issue seems to be revolving around the frequency of garbage collection. From the default-err.log file i am seeing (on average) an Allocation Failure occur every 2 secs. Here is a sample from the log with verbose:gc active:
<AF[4986]: Allocation Failure. need 208480 bytes, 78 ms since last AF>
<AF[4986]: managing allocation failure, action=2 (559165976/1342176248)>
<GC: Mon Oct 11 11:51:12 2004
<GC(4986): freed 4101528 bytes in 1559 ms, 41% free (563267504/1342176248)>
<GC(4986): mark: 1301 ms, sweep: 258 ms, compact: 0 ms>
<GC(4986): refs: soft 0 (age >= 32), weak 0, final 0, phantom 0>
<AF[4986]: completed in 1563 ms>
<AF[4987]: Allocation Failure. need 208536 bytes, 78 ms since last AF>
<AF[4987]: managing allocation failure, action=2 (559138336/1342176248)>
<GC: Mon Oct 11 11:51:14 2004
<GC(4987): freed 4105128 bytes in 1563 ms, 41% free (563243464/1342176248)>
<GC(4987): mark: 1293 ms, sweep: 270 ms, compact: 0 ms>
<GC(4987): refs: soft 0 (age >= 32), weak 0, final 0, phantom 0>
<AF[4987]: completed in 1563 ms>
As you can see, allocation failures are occuring all the time, and with 2secs between events, and each GC taking around 1.5secs, i am having massive problems with the response of the server. It seems that the javaw.exe process is just pegged at 100% CPU the whole time and then it will eventually grind to a halt, and the users will get terrible response times.
OK, the questions are:
- Even to me (a novice) the above extract from the log doesnt look good. Am i right?
- what would be causing this? (i know - how long is a peice of string but i am hoping somebody can point me in the right direction so i can look some more)
- what can i do about it? Is there any parameters i can put into the java args to help me out?
Currently i am running -Xms of 128meg and an -Xmx of 1024m with no other settings. There are at the moment about 200users logged onto this server concurrently, and it seems to die a couple of hours into them all being logged on. I then have to kick everybody out and reboot to get it in a working state again.
I am in some serious need of help from some gurus!! any help would be invaluable, thanks heaps guys.
Tim

Hi Again guys, thanks for all your replies.
I have been working my butt of on this issue and i just cant seem to get anywhere... probably due to my complete lack of knowledge on this whole GC thing! :)
One thing that i have noticed that seems to be very consistant is the fact that as soon as i get an "action=2" in my default-err.log from an allocation failure, thats when the system goes nuts and tends to not recover.
At all other times it is an action=1, and the system seems to be running OK, but as soon as i get action=2, the time between GC events drop from seconds to miliseconds, and the bytes required just skyrockets. It keeps on this upward spiral till i just have to reboot the box.
From all my reading, i have found that an action=2 means "2 - The Garbage Collector has tried to allocate out of the wilderness, and failed."
This is the only item in the logs that i see is directly related to the server performance.
Can anybody please explain to me (in laymans terms) what the action=2 means, what may cause it and what i should be looking at changing to fix it?
The extract from the log files (in my first post in this thread) are still valid, as are the min/max memory settings.
Any help at all would be invaluable.
Thanks very much.
Tim

DataGrid Garbage Collection problem

Hi,
I'm quite confused about the DataGrid component's garbage collection. I've made a simple test code which adds a datagrid to the display list. If I remove the component from its parent without clicking any item, the element is collected correctly. However, if I click an item, the datagrid is no longer removed. Otherwise, if I use the keyborad to navigate through the items, the component is removed.
The profiler doesn't display any inbound reference to the datagrid. So, what's the problem? Is Flex retaining any reference when I use the mouse?
Thanks in advance.

Hi,
here it goes:
the main application:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
     <mx:Script>
          <![CDATA[
               import com.adur.nodes.Child;
               private var _child:Child;
               private function onLinkClickHandler(event:MouseEvent) : void {
                    _linkButton.enabled      = false;
                    _unlinkButton.enabled      = true;
                    _child = new Child();
                    addChild(_child);
               private function onUnlinkClickHandler(event:MouseEvent) : void {
                    _linkButton.enabled      = true;
                    _unlinkButton.enabled      = false;
                    removeChild(_child);
                    _child = null;
                    System.gc();
          ]]>
     </mx:Script>
     <mx:VBox width="100%" height="100%">
          <mx:HBox width="100%" height="30">
               <mx:Button id="_linkButton" width="100" label="Link" click="onLinkClickHandler(event)" />
               <mx:Button id="_unlinkButton" width="100" label="Unlink" enabled="false" click="onUnlinkClickHandler(event)" />
          </mx:HBox>
          <mx:Box     id="_content" width="100%" height="100%" />
     </mx:VBox>
</mx:Application>
the Child class:
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="100%" height="100%" >
     <mx:ArrayCollection id="collection">
          <mx:source>
          <mx:Array>
               <mx:Object label="Option1" score="85" />
          </mx:Array>
          </mx:source>
     </mx:ArrayCollection>
     <mx:List dataProvider="{collection}" />
</mx:Canvas>
thanks harUI.

Full Garbage Collection Problem

Hi All,
We are working on NetWeaver Application Server JAVA 7.0
I am getting an error message in of the the EWA reports for JAVA system. The red alert says as below:
The maximum ratio of full garbage collections to total garbage collections in the reported interval was higher than 90%.
In order to solve the above problem, I increased Heap Memory for all JAVA Server nodes to 3072 (earlier it was 2048 for all the server nodes). However, still I am getting same error in EWA report.
Can any one help me in further analysing and solving the above problem?
Your help is appreciated.

Here are links to some of the tools. I have worked with [IBM GC for IBM JVM|http://www.ibm.com/developerworks/java/library/j-ibmtools2/index.html]. You may have to try others that can read Sun JVM's GC log.
http://www.tagtraum.com/gcviewer.html
http://www.yourkit.com/overview/index.jsp
https://h20392.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=HPJMETER
http://java.sun.com/performance/jvmstat/visualgc.html

Garbage Collection problem with BI 4.0

Hi experts,
I've installed BI 4.0, the operating system is SUSE Linux. In the logging directory are several *._gc.log-Files:
E.g. crproc_bobSIAN.CrystalReportsProcessingServer_child_gc.log:
34.609: [Full GC [PSYoungGen: 8352K->2707K(86976K)] [ParOldGen: 33449K->33470K(49472K)] 41801K->36177K(136448K) [PSPermGen: 35
487K->35460K(56640K)], 0.2510370 secs] [Times: user=0.25 sys=0.00, real=0.24 secs]
39.664: [GC [PSYoungGen: 81283K->4033K(100544K)] 114753K->40232K(150016K), 0.0387570 secs] [Times: user=0.03 sys=0.02, real=0.
04 secs]
41.271: [GC [PSYoungGen: 91137K->14332K(101440K)] 127336K->51242K(150912K), 0.0316510 secs] [Times: user=0.02 sys=0.01, real=0
.03 secs]
47.628: [GC [PSYoungGen: 101436K->15431K(112320K)] 138346K->66686K(163712K), 0.0623110 secs] [Times: user=0.06 sys=0.01, real=
0.06 secs]
47.690: [Full GC [PSYoungGen: 15431K->12343K(112320K)] [ParOldGen: 51255K->51388K(73088K)] 66686K->63731K(185408K) [PSPermGen:
63948K->63918K(96064K)], 0.5285130 secs] [Times: user=0.49 sys=0.04, real=0.53 secs]
659.998: [GC [PSYoungGen: 107383K->14966K(114752K)] 158771K->66354K(187840K), 0.1000770 secs]
or bobSIAN_gc.log:
3542.210: [GC 3542.233: [DefNew: 20756K->925K(22208K), 0.0036560 secs] 54323K->34493K(71208K), 0.0037360 secs] [Times: user=0.00 sys=0.00, real=0.03 secs]
3781.915: [GC 3781.942: [DefNew: 20701K->962K(22208K), 0.0031300 secs] 54269K->34530K(71208K), 0.0031840 secs] [Times: user=0.00 sys=0.00, real=0.03 secs]
4081.483: [GC 4081.499: [DefNew: 20738K->981K(22208K), 0.0030550 secs] 54306K->34549K(71208K), 0.0031110 secs]
It's also interesting, that I'm missing free space in the installation directory of Business Objects. There are no reports scheduled, but the directory still grows. Maybe it depends on problems with GC.
Any idea? Is there a best practice, how to configure the jvm?
Thanks and best regards,
Max

Hello Deepu,
The current plan for BI OnDemand is to support BOE 4.0 in the 2012 timeframe. We have not yet worked out a specific date for the release, though. The specific upgrade plan and long term feature roadmap is still under discussion for BI OnDemand.
Regards,
Terry Penner
BI OnDemand Product Owner

Problem with video garbage collection

I have problem with a cummulative memory issue. I have developed an air application that reproduces video when it is needed. Although my air process (myAir.exe) uses the same ammount of memory for days (stable, illustrating lack of development memory leak problems) the total system memory increases every time a video is being reproduced. Every time the video is stopped the memory used by this video is released but not completely resulting to a continuously increasing system memory. Is this a graphics card problem, an OS graphics garbage collection problem or an air development problem! Has anyone ever had a similar problem? Every response would be helpful.
Thank you in advance.

Just a question ..??.. as a result of this dbconn getting freed before method ends , are you getting resultsetclosed error ?..

Hotspot core dumping during JVM garbage collection ?

We have an application which calls a 3rd party supplied server API which has recently been upgraded to use Java 1.5
We are getting the following error reported by our client application. The application is also now running Java 1.5 but references many classes in jar files which would have quite old code in.
The supplier of the API has stated that the problem requires us to recompile all our jar files using v 1.5 ( including things like jconnect and jms ?!?!? ). This sounds like a bit of a cop-out to me, not to mention being impossible since we don't have the source for things like jconnect.
I suspect that there is a garbage collection problem at the bottom of all this, but I'm not sure how I can "prove" this, nor do I currently have any real clue as to how to fix any GC problem that may exist.
The application is supposed to wait for a message on a MQSeries queue and then transforms it via Xalan XSLT and sends it to a Server application. I've tried playing around with heap sizes etc but that just seems to make it worse. If I leave it at the settings that the previous version used then the client at least manages to process a couple of messages before core dumping. There doesn't seem to be a consistent trigger event to cause the core dump ( it's not a message arriving on a queue for example ) but it does seem to be fairly consistent timewise, i.e. after
Any ideas gratefully accepted.
Here's a logfile excerpt from my applications showing the Hotspot error message :
=====================================================================================
08-Jul-2008 10:01:05 Waiting for messages from COLT.BBFS
08-Jul-2008 10:02:05 Waiting for messages from COLT.BBFS
08-Jul-2008 10:03:05 Waiting for messages from COLT.BBFS
405.815: [GC [PSYoungGen: 17331K->9244K(37632K)] 111702K->103615K(192128K), 0.1615910 secs]
405.977: [Full GC#
# An unexpected error has been detected by HotSpot Virtual Machine:
# SIGBUS (0xa) at pc=0xfe141348, pid=2600, tid=8
# Java VM: Java HotSpot(TM) Server VM (1.5.0_03-b07 mixed mode)
# Problematic frame:
# V [libjvm.so+0x141348]
# An error report file with more information is saved as hs_err_pid2600.log
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
=====================================================================================
The logfile referred to in the error message contains the following.
=====================================================================================
# An unexpected error has been detected by HotSpot Virtual Machine:
# SIGBUS (0xa) at pc=0xfe141348, pid=2600, tid=8
# Java VM: Java HotSpot(TM) Server VM (1.5.0_03-b07 mixed mode)
# Problematic frame:
# V [libjvm.so+0x141348]
--------------- T H R E A D ---------------
Current thread (0x001484d8): VMThread [id=8]
siginfo:si_signo=10, si_errno=0, si_code=1, si_addr=0x0000080f
Registers:
O0=0x00487588 O1=0xfe7d6454 O2=0x000079b0 O3=0x00007800
O4=0x00008868 O5=0x00147d48 O6=0xf8781460 O7=0xfe0f7938
G1=0xe52aaae8 G2=0x00000003 G3=0x00000003 G4=0x001484d8
G5=0xf8781d98 G6=0x00000002 G7=0xf8781d98 Y=0x805683e2
PC=0xfe141348 nPC=0xfe14134c
Top of Stack: (sp=0xf8781460)
0xf8781460: fe786000 00c6ba20 fe10013c e54bab68
0xf8781470: 0000080f e54bab6c 0000080f 00000004
0xf8781480: 00487588 00000134 e54bab6c 00000004
0xf8781490: 00000001 00000000 f87814c0 fe17aef4
0xf87814a0: fe6485b4 fe7d899c 001484d8 0011da40
0xf87814b0: 00148988 00148c10 00148d7c f8781880
0xf87814c0: 007c3389 007c3c0e 00000f87 00008868
0xf87814d0: 00008800 00487588 fe141310 fe7d6454
Instructions: (pc=0xfe141348)
0xfe141338: ec 06 c0 1a 80 a5 a0 00 22 40 00 0a ba 07 60 01
0xfe141348: f2 05 a0 00 ae 0e 60 03 80 a5 e0 03 22 40 00 05
Stack: [0xf8702000,0xf8781d98), sp=0xf8781460, free space=509k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x141348]
V [libjvm.so+0x17aefc]
V [libjvm.so+0x2d557c]
V [libjvm.so+0x300ef8]
V [libjvm.so+0x301e84]
V [libjvm.so+0x2ff950]
V [libjvm.so+0x29df30]
V [libjvm.so+0x362b44]
V [libjvm.so+0x6436f0]
VM_Operation (0xe03012b0): parallel gc system gc, mode: safepoint, requested by thread 0x0031bca0
--------------- P R O C E S S ---------------
Java Threads: ( => current thread )
0x00b2c028 JavaThread "Thread-4" [_thread_in_native, id=85]
0x007f5048 JavaThread "Thread-0" [_thread_blocked, id=84]
0x00c27cf0 JavaThread "Notification Delivery" [_thread_blocked, id=81]
0x0026fa08 JavaThread "RMI LeaseChecker" daemon [_thread_blocked, id=73]
0x00821048 JavaThread "RMI RenewClean-[162.11.2.32:44425]" daemon [_thread_blocked, id=70]
0x0031bca0 JavaThread "GC Daemon" daemon [_thread_blocked, id=67]
0x00cd5d28 JavaThread "RMI Reaper" [_thread_blocked, id=66]
0x003c9300 JavaThread "Timer-0" daemon [_thread_blocked, id=65]
0x00929fe0 JavaThread "RMI TCP Accept-0" daemon [_thread_in_native, id=64]
0x0089bf18 JavaThread "SeedGenerator Thread" daemon [_thread_blocked, id=42]
0x00c47248 JavaThread "Pool thread #7" daemon [_thread_blocked, id=38]
0x00c466a0 JavaThread "Pool thread #6" daemon [_thread_blocked, id=37]
0x00311850 JavaThread "Pool thread #5" daemon [_thread_blocked, id=36]
0x00287a40 JavaThread "Pool thread #4" daemon [_thread_blocked, id=35]
0x00286e98 JavaThread "Pool thread #3" daemon [_thread_blocked, id=34]
0x00c134b0 JavaThread "Pool thread #2" daemon [_thread_blocked, id=33]
0x00ad09e0 JavaThread "Pool thread #1" daemon [_thread_blocked, id=32]
0x00286cd8 JavaThread "PoolThreadManager" daemon [_thread_blocked, id=31]
0x00c129e0 JavaThread "Channel Reaper" daemon [_thread_blocked, id=30]
0x00c669e8 JavaThread "ORB Daemon Thread" daemon [_thread_blocked, id=29]
0x00b10170 JavaThread "Worker for ServerProtocol: (iiop) /0.0.0.0:20168" daemon [_thread_blocked, id=22]
0x008a17e0 JavaThread "Syn~ Client" daemon [_thread_blocked, id=21]
0x003dc378 JavaThread "PoolScavenger0" daemon [_thread_blocked, id=20]
0x0015a928 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=15]
0x00159880 JavaThread "CompilerThread1" daemon [_thread_blocked, id=14]
0x00158a18 JavaThread "CompilerThread0" daemon [_thread_blocked, id=13]
0x00157b98 JavaThread "AdapterThread" daemon [_thread_blocked, id=12]
0x00156dc8 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=11]
0x0014ccd8 JavaThread "Finalizer" daemon [_thread_blocked, id=10]
0x0014ad90 JavaThread "Reference Handler" daemon [_thread_blocked, id=9]
0x00038238 JavaThread "main" [_thread_in_native, id=1]
Other Threads:
=>0x001484d8 VMThread [id=8]
0x0015c3b0 WatcherThread [id=16]
VM state:at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: ([mutex/lock_event])
[0x00037728/0x00037758] Threads_lock - owner thread: 0x001484d8
[0x00033650/0x00037ba8] Heap_lock - owner thread: 0x0031bca0
Heap
PSYoungGen total 37632K, used 9244K [0xf2eb0000, 0xf7ba0000, 0xf8400000)
eden space 28352K, 0% used [0xf2eb0000,0xf2eb0000,0xf4a60000)
from space 9280K, 99% used [0xf4a60000,0xf5367080,0xf5370000)
to space 25216K, 0% used [0xf6300000,0xf6300000,0xf7ba0000)
PSOldGen total 154496K, used 94371K [0xe8400000, 0xf1ae0000, 0xf2eb0000)
object space 154496K, 61% used [0xe8400000,0xee028e78,0xf1ae0000)
PSPermGen total 35584K, used 18260K [0xe4400000, 0xe66c0000, 0xe8400000)
object space 35584K, 51% used [0xe4400000,0xe55d5158,0xe66c0000)
Dynamic libraries:
0x00010000      /dsdvlp/java/jvm/jdk1.5.0_03/bin/java
0xff350000      /usr/lib/libthread.so.1
0xff340000      /usr/lib/libdl.so.1
0xff200000      /usr/lib/libc.so.1
0xff390000      /usr/platform/SUNW,Sun-Fire-880/lib/libc_psr.so.1
0xfe000000      /dsdvlp/java/jvm/jdk1.5.0_03/jre/lib/sparc/server/libjvm.so
0xff1e0000      /usr/lib/libsocket.so.1
0xff2d0000      /usr/lib/libsched.so.1
0xff1b0000      /usr/lib/libCrun.so.1
0xff160000      /usr/lib/libm.so.1
0xff080000      /usr/lib/libnsl.so.1
0xff060000      /usr/lib/libmp.so.2
0xff030000      /dsdvlp/java/jvm/jdk1.5.0_03/jre/lib/sparc/native_threads/libhpi.so
0xfdfc0000      /dsdvlp/java/jvm/jdk1.5.0_03/jre/lib/sparc/libverify.so
0xfdf80000      /dsdvlp/java/jvm/jdk1.5.0_03/jre/lib/sparc/libjava.so
0xfdf50000      /dsdvlp/java/jvm/jdk1.5.0_03/jre/lib/sparc/libzip.so
0xfb7e0000      /usr/lib/locale/en_GB.ISO8859-1/en_GB.ISO8859-1.so.2
0xe4190000      /dsdvlp/java/jvm/jdk1.5.0_03/jre/lib/sparc/libnet.so
0xe3bd0000      /dsdvlp/lib/5/libSolarisNatives.so
0xe3e90000      /dsdvlp/java/jvm/jdk1.5.0_03/jre/lib/sparc/librmi.so
VM Arguments:
jvm_args: -Djava.ext.dirs=/dsdvlp/java/tmijar/firs7/lib/cli:/dsdvlp/java/tmijar/firs7/lib/cli/ext:/dsdvlp/java/tmijar/firs7/lib/cmn/OpenORB:/dsdvlp/java/tmijar/firs7/lib/cmn/OpenORB/ext:/dsdvlp/java/tmijar/firs7/lib/cmn:/dsdvlp/java/tmijar/firs7/lib/cmn/ext:/dsdvlp/java/tmijar/firs7/daemonlib -Duser.dir=/dsdvlp/java/tmijar/firs7 -Dopenorb.config=file:/dsdvlp/java/tmijar/firs7/configs/OpenORB/config/SynOpenORB.xml -Dopenorb.home=file:/dsdvlp/java/tmijar/firs7/configs/OpenORB -Dcom.coexis.syn.general.orbbinding=com.coexis.syn.general.orbbinding.openorb.OpenORBBinding_1_4 -Dsun.rmi.dgc.client.gcInterval=360000 -Dsun.rmi.dgc.server.gcInterval=360000000 -Xms32m -Xmx256m -Dcom.coexis.syn.clientcommandsconfiglocation=file://localhost//dsdvlp/java/tmijar/firs7/configs/clientcommands.xml -Dcom.coexis.syn.clientconfiglocation=file://localhost//dsdvlp/java/tmijar/firs7/configs/fsbbtd_client.xml -XX:+PrintGCTimeStamps -XX:+PrintGCDetails
java_command: com.coexis.syn.mqmessaging.daemon.RunDaemon -p /dsdvlp/bin/5/lndsfsd_fsbbtd.properties start
Environment Variables:
JAVA_HOME=/dsdvlp/java/jvm/jdk150
CLASSPATH=.:/dsdvlp/java/jar/jconnect520.jar:/dsdvlp/java/jar/vbjapp340.jar:/dsdvlp/java/jar/vbjorb340.jar:/dsdvlp/java/jar/javax_jndi120.jar
PATH=/usr/local/etc:/usr/lang:/usr/openwin/bin:/usr/ucb:/bin:/usr/etc:/usr/local/5/bin:/dsdvlp/bin/5:/dsdvlp/bin/4:/home/app/sybase/5/bin:/home/app/sybase/5/localscripts:/home/app/sybase/5/sqr:/home/app/lang:/home/app/lang/SC2.0.1:/usr/ccs/bin:/usr/local/opt/Acrobat3/bin:/dsdvlp/bin:.
LD_LIBRARY_PATH=/dsdvlp/java/jvm/jdk1.5.0_03/jre/lib/sparc/server:/dsdvlp/java/jvm/jdk1.5.0_03/jre/lib/sparc:/dsdvlp/java/jvm/jdk1.5.0_03/jre/../lib/sparc:/usr/lib:/usr/openwin/lib:/usr/local/5/lib:/dsdvlp/lib/5:/dstest/lib/5:/home/app/sybase/5/lib:/dstest/cats/sun4/lib:/tmitest/Opus/opus/lib
SHELL=/bin/csh
DISPLAY=CLI00184.mfil.local:1.0
OS=5
--------------- S Y S T E M ---------------
OS: Solaris 8 2/02 s28s_u7wos_08a SPARC
Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
Assembled 18 December 2001
uname:SunOS 5.8 Generic_117350-20 sun4u (T1 libthread)
rlimit: STACK 8192k, CORE 9216k, NOFILE 4096, AS infinity
load average:2.24 2.67 2.68
CPU:total 4 has_v8, has_v9, has_vis1, has_vis2, is_ultra3
Memory: 8k page, physical 8388608k(166384k free)
vm_info: Java HotSpot(TM) Server VM (1.5.0_03-b07) for solaris-sparc, built on Apr 13 2005 03:31:26 by unknown with unknown Workshop:0x550

The very first suggestion I have is to move your VM to a more recent update of 1.5.0.
It looks like you are crashing with 5.0u3, and I'm pretty sure 5.0u16 is available. You
don't want to waste your time chasing a bug that's already been fixed.

All Tweens randomly halting (Not Garbage Collection)

I am developing a game with some AS3 tweens. I have encountered the problem of garbage collection affecting tweens before so I have all my tweens referenced at the class level now to ensure that isn't a problem. However, randomly all the current tweens in my game will stop. Other, non-tweened, frame by frame animations continue. It's just like the garbage collection problem but the tweens shouldn't be being collected...
The code I am using for tweens:
Var declaration at the top of the class:
private var gateTween:Tween;
This code in a function:
gateTween = new Tween(currentGate, "x", None.easeOut, 800, 380, 1.5, true);
gateTween.addEventListener(TweenEvent.MOTION_FINISH, horseJump);
Any ideas would be appriciated.

I have Swing based java project. Im setting all the
references to null as and when i dont need them, and
then im calling System.gc() also.
However it seems the memory is not being released,
when i check in the task manager, memory usage does
not reduce. It seems garbage collection is not
happening.Actually I have a small class - where in I try to do this:-
public class TestDebug extends Object{
/** Creates a new instance of TestDebug */
public TestDebug() {
* @param args the command line arguments
public static void main(String[] args) {
System.out.println("Trying to debug this");
TestDebug testDebug = new TestDebug();
testDebug.finalize();
System.out.println("Lasting print");
public void finalize(){
System.out.println("Finalize called");
System.gc();
System.out.println("Finalize finished");
But it is also true that you should never try to force it - It has its own way to do it.
For Example try to execute a big code(so that you can find JVM doing the GC) as "java -verbose:gc class-name"
You will find at some points during the execution process - that the JVM actually runs the GC on its own- but when not that is not defined.It is a low priority thread running under JVM.

Understanding Garbage Collection

Garbase Collector collects any objects that the program cannot access. If an object cannot be accessed, it will be collected by the garbage collector if needed.
Can someone explain with a simple example when an object cannot be garbase collected? preferably an example with 'String'
thanks

String text = "Hallo";
//the instance "Hallo" cannot be collected here
String message = text;
text = null;
//neither here;
message = null;
//The instance "Hallo" can be collecter here by the GBI don't think that this is the way it works. Garbage collection frees memory for use, and in this case, the variable text could still be referenced, even though it does not have a value. I might be wrong, but my guess would be that setting a variable to be null, would result in the location of memory allocated for the variable to be emptied (e.g. C-function memset). If the garbage collection would occur when the variable is set to null might cause problems, like so:
String foo = "bar; // Create and initliaze variable
foo = null; // Set to null, assume garbage collection
String bar = "foor"; // Create and initialize. If this were now stored
// in the same memory slot as foo, which would be possible due
// to the garbage collection, problems would arise from next line
foo = "bar"; // Now foo and bar refer to the same memory locationTherefore garbage collection occurs only when no object or class holds no reference to the variable, example:
if(foobar) {
String localVar = "local variable";
// When the if-block ends, the variable localVariable is collected
// as it no longer can be referenced.Tuomas Rinta

Performance problem due to garbage collection?

Hallo,
we implemented a digital whiteboard with JavaFX: there is a scene (3200 x 2400 px) on which you can draw (insert paths) and add post-its (colored rectangles with paths or string a content). It's possible to drag the post-its around and it's also possible to pan the scene (to reach all parts of the scene which don't fit into the windows).
The application works quite fast even with ca. 50 post-its and lots of skribbles/drawings. But after ca. 20 minutes the application gets a lot slower. Drawing curves (or handwriting) is not really possible anymore as the paths get angular and moving a post-it takes longer and longer.
How is this possible? Is there a problem with the JavaFX garbage collection? Does anyone else have the problem that the application gets slower after a while?
When I close the window and load it again with the same elements it's as quick as in the beginning and slows down after ca. 20 min. again.
Thanks for your help and suggestions what could be the problem!
Raja

I can't really answer...
We can eliminate saturation of scenegraph capabilities since you can reload it again without problem (at start).
Maybe you create lot of temp objects that aren't properly collected?
I suggest to run JVisualVM on your application and watch its memory (and CPU) usage.

High cpu usage for garbage collection (uptime vs total gc time)

Hi Team,
We have a very high cpu usage issue in the production.
When we restart the server, the cpu idle time would be around 95% and it comes down as days goes by. Today idle cpu is 30% and it is just 6th day after the server restart.
Environemnt details:
Jrockit version:
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)
BEA WebLogic JRockit(TM) 1.4.2_05 JVM R24.4.0-1 (build ari-38120-20041118-1131-linux-ia32, Native Threads, GC strategy: parallel)
Gc Algorithm: JRockit Garbage Collection System currently running strategy: Single generational, parallel mark, parallel sweep
Number Of Processors: 4
Max Heap Size: 1073741824
Total Garbage Collection Time: 21:43:56.5
Uptime: 114:33:4.1
Total Garbage Collection Count: 420872
Total Number Of Threads: 198
Number Of Daemon Threads: 191
Can you guys please tell me what would be problem in the server which causing the high cpu usage?
One more thing I would like to know is that why the total number of threads is 198 when we specified the Executor pool size as 25? I agree that weblogic would create some threads for its maintenance but around 160 threads!!! something is wrong I guess.
Santhosh.
[email protected]

Hi,
I'm having a similar problem, but haven't been able to resolve it yet. Troubleshooting is made even harder by the fact that this is only happening on our production server, and I've been unable to reproduce it in the lab.
I'll post whatever findings I have and hopefully we'll be able to find a solution with the help of BEA engineers.
In my case, I have a stand-alone Tomcat server that runs fine for about 1-2 days, and then the JVM suddenly starts using more CPU, and as a result, the server load shoots up (normal CPU utilization is ~5% but eventually goes up to ~95%; load goes from 0.1 to 4+).
What I have found so far is that this corresponds to increased GC activity.
Let me list my environment specs before I proceed, though:
CPU: Dual Xeon 3.06GHz
RAM: 2GB
OS: RHEL4.4 (2.6.9-42.0.2.ELsmp)
JVM build 1.5.0_03-b07 (BEA JRockit(R) (build dra-45238-20050523-2008-linux-ia32, R25.2.0-28))
Tomcat version 5.5.12
JAVA_OPTS="-Xms768m -Xmx768m -XXtlasize16k -XXlargeobjectlimit16k -Xverbose:memory,cpuinfo -Xverboselog:/var/log/tomcat5/jvm.log -Xverbosetimestamp"
Here are excerpts from my verbose log (I'm getting some HT warning, not sure if that's a problem):
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Detected SMP with 2 CPUs that support HT.
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Trying to determine if HT is enabled.
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Trying to read from /dev/cpu/0/cpuid
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Warning: Failed to read from /dev/cpu/0/cpuid
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Trying to read from /dev/cpu/1/cpuid
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Warning: Failed to read from /dev/cpu/1/cpuid
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] HT is: supported by the CPU, not enabled by the OS, enabled in JRockit.
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Warning: HT enabled even though OS does not seem to support it.
[Fri Oct 20 15:54:55 2006][22855][memory ] GC strategy: System optimized over throughput (initial strategy singleparpar)
[Fri Oct 20 15:54:55 2006][22855][memory ] heap size: 786432K, maximal heap size: 786432K
[Fri Oct 20 16:07:30 2006][22855][memory ] Changing GC strategy to generational, parallel mark and parallel sweep
[Fri Oct 20 16:07:30 2006][22855][memory ] 791.642-791.874: GC 786432K->266892K (786432K), 232.000 ms
[Fri Oct 20 16:08:02 2006][22855][memory ] 824.122: nursery GC 291998K->274164K (786432K), 175.873 ms
[Fri Oct 20 16:09:51 2006][22855][memory ] 932.526: nursery GC 299321K->281775K (786432K), 110.879 ms
[Fri Oct 20 16:10:24 2006][22855][memory ] 965.844: nursery GC 308151K->292222K (786432K), 174.609 ms
[Fri Oct 20 16:11:54 2006][22855][memory ] 1056.368: nursery GC 314718K->300068K (786432K), 66.032 ms
[Sat Oct 21 23:21:09 2006][22855][memory ] 113210.427: nursery GC 734274K->676137K (786432K), 188.985 ms
[Sat Oct 21 23:30:41 2006][22855][memory ] 113783.140: nursery GC 766601K->708592K (786432K), 96.007 ms
[Sat Oct 21 23:36:15 2006][22855][memory ] 114116.332-114116.576: GC 756832K->86835K (786432K), 243.333 ms
[Sat Oct 21 23:48:20 2006][22855][memory ] 114841.653: nursery GC 182299K->122396K (786432K), 175.252 ms
[Sat Oct 21 23:48:52 2006][22855][memory ] 114873.851: nursery GC 195060K->130483K (786432K), 142.122 ms
[Sun Oct 22 00:01:31 2006][22855][memory ] 115632.706: nursery GC 224096K->166618K (786432K), 327.264 ms
[Sun Oct 22 00:16:37 2006][22855][memory ] 116539.368: nursery GC 246564K->186328K (786432K), 173.888 ms
[Sun Oct 22 00:26:21 2006][22855][memory ] 117122.577: nursery GC 279056K->221543K (786432K), 170.367 ms
[Sun Oct 22 00:26:21 2006][22855][memory ] 117123.041: nursery GC 290439K->225833K (786432K), 69.170 ms
[Sun Oct 22 00:29:10 2006][22855][memory ] 117291.795: nursery GC 298947K->238083K (786432K), 207.200 ms
[Sun Oct 22 00:39:05 2006][22855][memory ] 117886.478: nursery GC 326956K->263441K (786432K), 87.009 ms
[Sun Oct 22 00:55:22 2006][22855][memory ] 118863.947: nursery GC 357229K->298971K (786432K), 246.643 ms
[Sun Oct 22 01:08:17 2006][22855][memory ] 119638.750: nursery GC 381744K->322332K (786432K), 147.996 ms
[Sun Oct 22 01:11:22 2006][22855][memory ] 119824.249: nursery GC 398678K->336478K (786432K), 93.046 ms
[Sun Oct 22 01:21:35 2006][22855][memory ] 120436.740: nursery GC 409150K->345186K (786432K), 81.304 ms
[Sun Oct 22 01:21:38 2006][22855][memory ] 120439.582: nursery GC 409986K->345832K (786432K), 153.534 ms
[Sun Oct 22 01:21:42 2006][22855][memory ] 120443.544: nursery GC 410632K->346473K (786432K), 121.371 ms
[Sun Oct 22 01:21:44 2006][22855][memory ] 120445.508: nursery GC 411273K->347591K (786432K), 60.688 ms
[Sun Oct 22 01:21:44 2006][22855][memory ] 120445.623: nursery GC 412391K->347785K (786432K), 68.935 ms
[Sun Oct 22 01:21:45 2006][22855][memory ] 120446.576: nursery GC 412585K->348897K (786432K), 152.333 ms
[Sun Oct 22 01:21:45 2006][22855][memory ] 120446.783: nursery GC 413697K->349080K (786432K), 70.456 ms
[Sun Oct 22 01:34:16 2006][22855][memory ] 121197.612: nursery GC 437378K->383392K (786432K), 165.771 ms
[Sun Oct 22 01:37:37 2006][22855][memory ] 121398.496: nursery GC 469709K->409076K (786432K), 78.257 ms
[Sun Oct 22 01:37:37 2006][22855][memory ] 121398.730: nursery GC 502490K->437713K (786432K), 65.747 ms
[Sun Oct 22 01:44:03 2006][22855][memory ] 121785.259: nursery GC 536605K->478156K (786432K), 132.293 ms
[Sun Oct 22 01:44:04 2006][22855][memory ] 121785.603: nursery GC 568408K->503635K (786432K), 71.751 ms
[Sun Oct 22 01:50:39 2006][22855][memory ] 122180.985: nursery GC 591332K->530811K (786432K), 131.831 ms
[Sun Oct 22 02:13:52 2006][22855][memory ] 123573.719: nursery GC 655566K->595257K (786432K), 117.311 ms
[Sun Oct 22 02:36:04 2006][22855][memory ] 124905.507: nursery GC 688896K->632129K (786432K), 346.990 ms
[Sun Oct 22 02:50:24 2006][22855][memory ] 125765.715-125765.904: GC 786032K->143954K (786432K), 189.000 ms
[Sun Oct 22 02:50:26 2006][22855][memory ] 125767.535-125767.761: GC 723232K->70948K (786432K), 225.000 ms
vvvvv
[Sun Oct 22 02:50:27 2006][22855][memory ] 125768.751-125768.817: GC 712032K->71390K (786432K), 64.919 ms
[Sun Oct 22 02:50:28 2006][22855][memory ] 125769.516-125769.698: GC 711632K->61175K (786432K), 182.000 ms
[Sun Oct 22 02:50:29 2006][22855][memory ] 125770.753-125770.880: GC 709632K->81558K (786432K), 126.000 ms
[Sun Oct 22 02:50:30 2006][22855][memory ] 125771.699-125771.878: GC 708432K->61368K (786432K), 179.000 ms
So, I'm running with the default GC strategy which lets the GC pick the most suitable approach (single space or generational). It seems to switch to generational almost immediately and runs well - most GC runs are in the nursery, and only once in a while it goes through the older space.
Now, if you look at [Sun Oct 22 02:50:27 2006], that's when everything changes. GC starts running every second (later on it's running 3 times a second) doing huge sweeps. It never goes through the nursery again, although the strategy is still generational.
It's all downhill from this point on, and it's a matter of hours (maybe a day) before we restart the server.
I guess my only question is: What would cause such GC behavior?
I would appreciate your ideas/comments!
Thanks,
Tenyo

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

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.

Garbage Collection not releasing memory properly

Hello, In my web application memory is not releasing properly, after some point of time application throw out of memory error, we are using tomcat5, jdk5, my heap size is half of the RAM.Garbage Collection not releasing memory properly.

sabre150 wrote:
punter wrote:
georgemc wrote:
Yep. Couldn't be a problem with your code, it must be that garbage collection doesn't work and nobody else noticed. Raise a bug with Sun.Are you serious ?You need to replace your sarcasm detector.I have blowed my sarcasm meter and limping in the blindness !!!! :(

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

Garbage Collection Problem

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