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Posted to users@cocoon.apache.org by Oleg Konovalov <ol...@yahoo.com> on 2006/07/07 16:06:59 UTC
OutOfMemoryError
Hi,
We are getting OutOfMemoryError
16:26:41,011 ERROR [STDERR] java.lang.OutOfMemoryError
in our production server (which has 4GB of RAM, javaVM - max 2GB)
every other day. All applications stop responding.
We have a bunch of Cocoon applications [mostly 2.0.4] running on JBoss3.0.7.
It is totally unclear which application is causing the problem.
I don't remember that problem happening in our Development or Testing environment
(where max JavaVM=512MB), but I guess it has a much lighter load.
Is there any known memory problem with Cocoon ?
Is there a way to do memory profiling of Cocoon Apps ? Any particular tool ?
(I have done memory profiling of Java applets with JProbe years ago)
Any advice is very appreciated.
Thank you in advance,
Oleg.
Re: AW: AW: OutOfMemoryError
Posted by Ralph Goers <Ra...@dslextreme.com>.
Dan Durkin wrote:
> Ralph,
>
> Can you elaborate on how you see that a given pool size is too low?
>
> Thanks,
>
> Dan
>
This happened just last week. We were doing CPU profiling with YourKit
and when I drilled down I saw the resource limiting pool was creating
XML serializers. You would never see this (in a warmed up system) if the
pool size was OK. Its harder to see in production. I've had our
operations folks periodically take thread dumps and then I look at
them. Usually, you will see the resource limiting pool if some pool
size is too low, but you usually won't see what the object is.
Ralph
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Re: AW: AW: OutOfMemoryError
Posted by Dan Durkin <du...@macchine.com>.
Ralph Goers wrote:
> Christofer Dutz wrote:
>>
>> Hi Oleg
>>
>> Well exactly this is why I used JRockit, because I didn’t want to
>> bother finding out how to tweak it ;) I know that the way the
>> Garbagecollector works can be configured using command-line
>> parameters, but I don’t know which ones and if they have the desired
>> effect.
>>
>> I just wanted to give you the hint that you will not find any real
>> memory-leaks, because there aren’t any and that the problems you are
>> having result of a garbage collection problem in the VM … realizing
>> this earlier would have made many many days of code-checking and
>> profiling obsolete L
>>
>> Good luck,
>>
>> Chris
>>
> I have to disagree. While you may not find any memory leaks, profiling
> should always be recommended. First, it helps you understand how your
> application operates. Second, you may find that you have pool sizes that
> are too low or that you need to modify some pipelines or make some other
> modifications.
>
> However, we have found significant improvements by modifying the JVM
> settings. Unfortunately, I don't have them in front of me at the moment.
>
> Ralph
Ralph,
Can you elaborate on how you see that a given pool size is too low?
Thanks,
Dan
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AW: AW: AW: OutOfMemoryError
Posted by Christofer Dutz <du...@c-ware.de>.
Hi Raplh,
what I wanted to say is that memory is not always freed in the default VM
settings. Otherwise hitting the "Garbage Collect" Button in the VM Monitor
application wouldn't be able to free GBs of unused memory.
Chris
-----Ursprüngliche Nachricht-----
Von: Ralph Goers [mailto:Ralph.Goers@dslextreme.com]
Gesendet: Dienstag, 11. Juli 2006 15:54
An: users@cocoon.apache.org
Betreff: Re: AW: AW: OutOfMemoryError
Christofer Dutz wrote:
>
> Hi Oleg
>
> Well exactly this is why I used JRockit, because I didnt want to
> bother finding out how to tweak it ;) I know that the way the
> Garbagecollector works can be configured using command-line
> parameters, but I dont know which ones and if they have the desired
> effect.
>
> I just wanted to give you the hint that you will not find any real
> memory-leaks, because there arent any and that the problems you are
> having result of a garbage collection problem in the VM
realizing
> this earlier would have made many many days of code-checking and
> profiling obsolete L
>
> Good luck,
>
> Chris
>
I have to disagree. While you may not find any memory leaks, profiling
should always be recommended. First, it helps you understand how your
application operates. Second, you may find that you have pool sizes that
are too low or that you need to modify some pipelines or make some other
modifications.
However, we have found significant improvements by modifying the JVM
settings. Unfortunately, I don't have them in front of me at the moment.
Ralph
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---------------------------------------------------------------------
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Re: AW: AW: OutOfMemoryError
Posted by Ralph Goers <Ra...@dslextreme.com>.
Christofer Dutz wrote:
>
> Hi Oleg
>
> Well exactly this is why I used JRockit, because I didn’t want to
> bother finding out how to tweak it ;) I know that the way the
> Garbagecollector works can be configured using command-line
> parameters, but I don’t know which ones and if they have the desired
> effect.
>
> I just wanted to give you the hint that you will not find any real
> memory-leaks, because there aren’t any and that the problems you are
> having result of a garbage collection problem in the VM … realizing
> this earlier would have made many many days of code-checking and
> profiling obsolete L
>
> Good luck,
>
> Chris
>
I have to disagree. While you may not find any memory leaks, profiling
should always be recommended. First, it helps you understand how your
application operates. Second, you may find that you have pool sizes that
are too low or that you need to modify some pipelines or make some other
modifications.
However, we have found significant improvements by modifying the JVM
settings. Unfortunately, I don't have them in front of me at the moment.
Ralph
---------------------------------------------------------------------
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For additional commands, e-mail: users-help@cocoon.apache.org
AW: AW: AW: OutOfMemoryError
Posted by Christofer Dutz <du...@c-ware.de>.
Hi Oleg,
We had the problems with a JDK 1.5_02 (I think) on a Windows 2003 server. As
far as I remember (this was a few months ago) this is no real bug in the
sense of not working correctly. For performance reasons the default GC
doesnt walk through the entire reference Tree, it only checks a few levels.
If you have circular references thats size exceeds the maximum scanning
depth of the GC, it wont detect that. As far as I know this is not limited
to only this VM since it is a basic Algorithm problem. Mabe Dan can help you
with the VM settings (since I didt it the lazy way ;) )
Regards,
Chris
[ c h r i s t o f e r d u t z ]
IT-Berater
univativ GmbH & Co. KG
Robert-Bosch-Str. 7, 64293 Darmstadt
fon: 0 61 51 / 66 717 - 21
fax: 0 61 51 / 66 717 - 29
email: christofer.dutz@univativ.de
http://www.univativ.de
Darmstadt, Stuttgart, Karlsruhe, Düsseldorf
_____
Von: Oleg Konovalov [mailto:olegkon@yahoo.com]
Gesendet: Dienstag, 11. Juli 2006 23:21
An: users@cocoon.apache.org
Betreff: Re: AW: AW: OutOfMemoryError
Christofer,
Which version of Sun JavaVM did you have the problem with
("default Garbage Collection Settings seem to have problems with circular
references")?
On which platform ?
Is there open issue you can refer me to ?
Our Production environment runs on JDK1.4.2_04 on Solaris 9 (32 bit) on
SPARC.
I was thinking, maybe upgrade to the latest one (1.4.2_12?) might have that
problem fixed?
Any info on that ?
Thank you,
Oleg.
----- Original Message ----
From: Christofer Dutz <du...@c-ware.de>
To: users@cocoon.apache.org; Oleg Konovalov <ol...@yahoo.com>
Sent: Tuesday, July 11, 2006 4:28:03 AM
Subject: AW: AW: OutOfMemoryError
Hi Oleg
Well exactly this is why I used JRockit, because I didnt want to bother
finding out how to tweak it ;) I know that the way the Garbagecollector
works can be configured using command-line parameters, but I dont know
which ones and if they have the desired effect.
I just wanted to give you the hint that you will not find any real
memory-leaks, because there arent any and that the problems you are having
result of a garbage collection problem in the VM
realizing this earlier
would have made many many days of code-checking and profiling obsolete :-(
Good luck,
Chris
[ c h r i s t o f e r d u t z ]
IT-Berater
univativ GmbH & Co. KG
Robert-Bosch-Str. 7, 64293 Darmstadt
fon: 0 61 51 / 66 717 - 21
fax: 0 61 51 / 66 717 - 29
email: christofer.dutz@univativ.de
http://www.univativ.de
Darmstadt, Stuttgart, Karlsruhe, Düsseldorf
_____
Von: Oleg Konovalov [mailto:olegkon@yahoo.com]
Gesendet: Montag, 10. Juli 2006 18:12
An: users@cocoon.apache.org
Betreff: Re: AW: OutOfMemoryError
Christofer,
Could you please elaborate on "We could have solved this by tweaking the GC
settings of the VM..."
I do not think we have an option of switching to BEA Jrockit VM.
We can only use Sun's JavaVM (1.4.2)
Also I found out (from another dev group) that the primary suspect is a new
application
which is not a Cocoon one, but WebWorks.
Any know memory issues for WebWorks apps ?
(I do realize that's a Cocoon mailing list, sorry... All other apps there
are Cocoon ones.)
Thank you,
Oleg.
----- Original Message ----
From: Christofer Dutz <du...@c-ware.de>
To: users@cocoon.apache.org; Oleg Konovalov <ol...@yahoo.com>
Sent: Monday, July 10, 2006 3:50:27 AM
Subject: AW: OutOfMemoryError
Hi Oleg,
we encountered similar problems and fortunately found our that these
problems were VM related. I assume you are using a standard Sun JDK
installation (This was the case with our system). When looking at the VM
memory consumption, we could see an increasing memory consumption. Whenever
we manually triggered a big garbage-collection most of this was freed
again. The problem is that the default Garbage Collection Settings seem to
have problems with circular references. Memory, which is not accessible, is
not freed because of this. We could have solved this by tweaking the GC
settings of the VM, but we got rid of the problems by using the BEA Jrockit
VM instead (I knew this would work and I didnt want to dig into all the
switches an leavers of the sun GC)
Hope this helps.
Regards,
Christofer
[ c h r i s t o f e r d u t z ]
IT-Berater
univativ GmbH & Co. KG
Robert-Bosch-Str. 7, 64293 Darmstadt
fon: 0 61 51 / 66 717 - 21
fax: 0 61 51 / 66 717 - 29
email: christofer.dutz@univativ.de
http://www.univativ.de
Darmstadt, Stuttgart, Karlsruhe, Düsseldorf
_____
Von: Oleg Konovalov [mailto:olegkon@yahoo.com]
Gesendet: Freitag, 7. Juli 2006 16:07
An: cocoon list
Betreff: OutOfMemoryError
Hi,
We are getting OutOfMemoryError
16:26:41,011 ERROR [STDERR] java.lang.OutOfMemoryError
in our production server (which has 4GB of RAM, javaVM - max 2GB)
every other day. All applications stop responding.
We have a bunch of Cocoon applications [mostly 2.0.4] running on JBoss3.0.7.
It is totally unclear which application is causing the problem.
I don't remember that problem happening in our Development or Testing
environment
(where max JavaVM=512MB), but I guess it has a much lighter load.
Is there any known memory problem with Cocoon ?
Is there a way to do memory profiling of Cocoon Apps ? Any particular tool ?
(I have done memory profiling of Java applets with JProbe years ago)
Any advice is very appreciated.
Thank you in advance,
Oleg.
Re: AW: AW: OutOfMemoryError
Posted by Oleg Konovalov <ol...@yahoo.com>.
Christofer,
Which version of Sun JavaVM did you have the problem with
("default Garbage Collection Settings seem to have problems with circular references")?
On which platform ?
Is there open issue you can refer me to ?
Our Production environment runs on JDK1.4.2_04 on Solaris 9 (32 bit) on SPARC.
I was thinking, maybe upgrade to the latest one (1.4.2_12?) might have that problem fixed?
Any info on that ?
Thank you,
Oleg.
----- Original Message ----
From: Christofer Dutz <du...@c-ware.de>
To: users@cocoon.apache.org; Oleg Konovalov <ol...@yahoo.com>
Sent: Tuesday, July 11, 2006 4:28:03 AM
Subject: AW: AW: OutOfMemoryError
Hi Oleg
Well exactly this is why I used JRockit, because I didn’t want to bother finding out how to tweak it ;) I know that the way the Garbagecollector works can be configured using command-line parameters, but I don’t know which ones and if they have the desired effect.
I just wanted to give you the hint that you will not find any real memory-leaks, because there aren’t any and that the problems you are having result of a garbage collection problem in the VM … realizing this earlier would have made many many days of code-checking and profiling obsolete L
Good luck,
Chris
[ c h r i s t o f e r d u t z ]
IT-Berater
univativ GmbH & Co. KG
Robert-Bosch-Str. 7, 64293 Darmstadt
fon: 0 61 51 / 66 717 - 21
fax: 0 61 51 / 66 717 - 29
email: christofer.dutz@univativ.de
http://www.univativ.de
Darmstadt, Stuttgart, Karlsruhe, Düsseldorf
Von: Oleg Konovalov [mailto:olegkon@yahoo.com]
Gesendet: Montag, 10. Juli 2006 18:12
An: users@cocoon.apache.org
Betreff: Re: AW: OutOfMemoryError
Christofer,
Could you please elaborate on "We could have solved this by tweaking the GC settings of the VM..."
I do not think we have an option of switching to BEA Jrockit VM.
We can only use Sun's JavaVM (1.4.2)
Also I found out (from another dev group) that the primary suspect is a new application
which is not a Cocoon one, but WebWorks.
Any know memory issues for WebWorks apps ?
(I do realize that's a Cocoon mailing list, sorry... All other apps there are Cocoon ones.)
Thank you,
Oleg.
----- Original Message ----
From: Christofer Dutz <du...@c-ware.de>
To: users@cocoon.apache.org; Oleg Konovalov <ol...@yahoo.com>
Sent: Monday, July 10, 2006 3:50:27 AM
Subject: AW: OutOfMemoryError
Hi Oleg,
we encountered similar problems and fortunately found our that these problems were VM related. I assume you are using a standard Sun JDK installation (This was the case with our system). When looking at the VM memory consumption, we could see an increasing memory consumption. Whenever we manually triggered a “big garbage-collection” most of this was freed again. The problem is that the default Garbage Collection Settings seem to have problems with circular references. Memory, which is not accessible, is not freed because of this. We could have solved this by tweaking the GC settings of the VM, but we got rid of the problems by using the BEA Jrockit VM instead (I knew this would work and I didn’t want to dig into all the switches an leavers of the sun GC)
Hope this helps.
Regards,
Christofer
[ c h r i s t o f e r d u t z ]
IT-Berater
univativ GmbH & Co. KG
Robert-Bosch-Str. 7, 64293 Darmstadt
fon: 0 61 51 / 66 717 - 21
fax: 0 61 51 / 66 717 - 29
email: christofer.dutz@univativ.de
http://www.univativ.de
Darmstadt, Stuttgart, Karlsruhe, Düsseldorf
Von: Oleg Konovalov [mailto:olegkon@yahoo.com]
Gesendet: Freitag, 7. Juli 2006 16:07
An: cocoon list
Betreff: OutOfMemoryError
Hi,
We are getting OutOfMemoryError
16:26:41,011 ERROR [STDERR] java.lang.OutOfMemoryError
in our production server (which has 4GB of RAM, javaVM - max 2GB)
every other day. All applications stop responding.
We have a bunch of Cocoon applications [mostly 2.0.4] running on JBoss3.0.7.
It is totally unclear which application is causing the problem.
I don't remember that problem happening in our Development or Testing environment
(where max JavaVM=512MB), but I guess it has a much lighter load.
Is there any known memory problem with Cocoon ?
Is there a way to do memory profiling of Cocoon Apps ? Any particular tool ?
(I have done memory profiling of Java applets with JProbe years ago)
Any advice is very appreciated.
Thank you in advance,
Oleg.
AW: AW: OutOfMemoryError
Posted by Christofer Dutz <du...@c-ware.de>.
Hi Oleg
Well exactly this is why I used JRockit, because I didnt want to bother
finding out how to tweak it ;) I know that the way the Garbagecollector
works can be configured using command-line parameters, but I dont know
which ones and if they have the desired effect.
I just wanted to give you the hint that you will not find any real
memory-leaks, because there arent any and that the problems you are having
result of a garbage collection problem in the VM
realizing this earlier
would have made many many days of code-checking and profiling obsolete :-(
Good luck,
Chris
[ c h r i s t o f e r d u t z ]
IT-Berater
univativ GmbH & Co. KG
Robert-Bosch-Str. 7, 64293 Darmstadt
fon: 0 61 51 / 66 717 - 21
fax: 0 61 51 / 66 717 - 29
email: christofer.dutz@univativ.de
http://www.univativ.de
Darmstadt, Stuttgart, Karlsruhe, Düsseldorf
_____
Von: Oleg Konovalov [mailto:olegkon@yahoo.com]
Gesendet: Montag, 10. Juli 2006 18:12
An: users@cocoon.apache.org
Betreff: Re: AW: OutOfMemoryError
Christofer,
Could you please elaborate on "We could have solved this by tweaking the GC
settings of the VM..."
I do not think we have an option of switching to BEA Jrockit VM.
We can only use Sun's JavaVM (1.4.2)
Also I found out (from another dev group) that the primary suspect is a new
application
which is not a Cocoon one, but WebWorks.
Any know memory issues for WebWorks apps ?
(I do realize that's a Cocoon mailing list, sorry... All other apps there
are Cocoon ones.)
Thank you,
Oleg.
----- Original Message ----
From: Christofer Dutz <du...@c-ware.de>
To: users@cocoon.apache.org; Oleg Konovalov <ol...@yahoo.com>
Sent: Monday, July 10, 2006 3:50:27 AM
Subject: AW: OutOfMemoryError
Hi Oleg,
we encountered similar problems and fortunately found our that these
problems were VM related. I assume you are using a standard Sun JDK
installation (This was the case with our system). When looking at the VM
memory consumption, we could see an increasing memory consumption. Whenever
we manually triggered a big garbage-collection most of this was freed
again. The problem is that the default Garbage Collection Settings seem to
have problems with circular references. Memory, which is not accessible, is
not freed because of this. We could have solved this by tweaking the GC
settings of the VM, but we got rid of the problems by using the BEA Jrockit
VM instead (I knew this would work and I didnt want to dig into all the
switches an leavers of the sun GC)
Hope this helps.
Regards,
Christofer
[ c h r i s t o f e r d u t z ]
IT-Berater
univativ GmbH & Co. KG
Robert-Bosch-Str. 7, 64293 Darmstadt
fon: 0 61 51 / 66 717 - 21
fax: 0 61 51 / 66 717 - 29
email: christofer.dutz@univativ.de
http://www.univativ.de
Darmstadt, Stuttgart, Karlsruhe, Düsseldorf
_____
Von: Oleg Konovalov [mailto:olegkon@yahoo.com]
Gesendet: Freitag, 7. Juli 2006 16:07
An: cocoon list
Betreff: OutOfMemoryError
Hi,
We are getting OutOfMemoryError
16:26:41,011 ERROR [STDERR] java.lang.OutOfMemoryError
in our production server (which has 4GB of RAM, javaVM - max 2GB)
every other day. All applications stop responding.
We have a bunch of Cocoon applications [mostly 2.0.4] running on JBoss3.0.7.
It is totally unclear which application is causing the problem.
I don't remember that problem happening in our Development or Testing
environment
(where max JavaVM=512MB), but I guess it has a much lighter load.
Is there any known memory problem with Cocoon ?
Is there a way to do memory profiling of Cocoon Apps ? Any particular tool ?
(I have done memory profiling of Java applets with JProbe years ago)
Any advice is very appreciated.
Thank you in advance,
Oleg.
Re: AW: OutOfMemoryError
Posted by Oleg Konovalov <ol...@yahoo.com>.
Christofer,
Could you please elaborate on "We could have solved this by tweaking the GC settings of the VM..."
I do not think we have an option of switching to BEA Jrockit VM.
We can only use Sun's JavaVM (1.4.2)
Also I found out (from another dev group) that the primary suspect is a new application
which is not a Cocoon one, but WebWorks.
Any know memory issues for WebWorks apps ?
(I do realize that's a Cocoon mailing list, sorry... All other apps there are Cocoon ones.)
Thank you,
Oleg.
----- Original Message ----
From: Christofer Dutz <du...@c-ware.de>
To: users@cocoon.apache.org; Oleg Konovalov <ol...@yahoo.com>
Sent: Monday, July 10, 2006 3:50:27 AM
Subject: AW: OutOfMemoryError
Hi Oleg,
we encountered similar problems and fortunately found our that these problems were VM related. I assume you are using a standard Sun JDK installation (This was the case with our system). When looking at the VM memory consumption, we could see an increasing memory consumption. Whenever we manually triggered a “big garbage-collection” most of this was freed again. The problem is that the default Garbage Collection Settings seem to have problems with circular references. Memory, which is not accessible, is not freed because of this. We could have solved this by tweaking the GC settings of the VM, but we got rid of the problems by using the BEA Jrockit VM instead (I knew this would work and I didn’t want to dig into all the switches an leavers of the sun GC)
Hope this helps.
Regards,
Christofer
[ c h r i s t o f e r d u t z ]
IT-Berater
univativ GmbH & Co. KG
Robert-Bosch-Str. 7, 64293 Darmstadt
fon: 0 61 51 / 66 717 - 21
fax: 0 61 51 / 66 717 - 29
email: christofer.dutz@univativ.de
http://www.univativ.de
Darmstadt, Stuttgart, Karlsruhe, Düsseldorf
Von: Oleg Konovalov [mailto:olegkon@yahoo.com]
Gesendet: Freitag, 7. Juli 2006 16:07
An: cocoon list
Betreff: OutOfMemoryError
Hi,
We are getting OutOfMemoryError
16:26:41,011 ERROR [STDERR] java.lang.OutOfMemoryError
in our production server (which has 4GB of RAM, javaVM - max 2GB)
every other day. All applications stop responding.
We have a bunch of Cocoon applications [mostly 2.0.4] running on JBoss3.0.7.
It is totally unclear which application is causing the problem.
I don't remember that problem happening in our Development or Testing environment
(where max JavaVM=512MB), but I guess it has a much lighter load.
Is there any known memory problem with Cocoon ?
Is there a way to do memory profiling of Cocoon Apps ? Any particular tool ?
(I have done memory profiling of Java applets with JProbe years ago)
Any advice is very appreciated.
Thank you in advance,
Oleg.
AW: OutOfMemoryError
Posted by Christofer Dutz <du...@c-ware.de>.
Hi Oleg,
we encountered similar problems and fortunately found our that these
problems were VM related. I assume you are using a standard Sun JDK
installation (This was the case with our system). When looking at the VM
memory consumption, we could see an increasing memory consumption. Whenever
we manually triggered a big garbage-collection most of this was freed
again. The problem is that the default Garbage Collection Settings seem to
have problems with circular references. Memory, which is not accessible, is
not freed because of this. We could have solved this by tweaking the GC
settings of the VM, but we got rid of the problems by using the BEA Jrockit
VM instead (I knew this would work and I didnt want to dig into all the
switches an leavers of the sun GC)
Hope this helps.
Regards,
Christofer
[ c h r i s t o f e r d u t z ]
IT-Berater
univativ GmbH & Co. KG
Robert-Bosch-Str. 7, 64293 Darmstadt
fon: 0 61 51 / 66 717 - 21
fax: 0 61 51 / 66 717 - 29
email: christofer.dutz@univativ.de
http://www.univativ.de
Darmstadt, Stuttgart, Karlsruhe, Düsseldorf
_____
Von: Oleg Konovalov [mailto:olegkon@yahoo.com]
Gesendet: Freitag, 7. Juli 2006 16:07
An: cocoon list
Betreff: OutOfMemoryError
Hi,
We are getting OutOfMemoryError
16:26:41,011 ERROR [STDERR] java.lang.OutOfMemoryError
in our production server (which has 4GB of RAM, javaVM - max 2GB)
every other day. All applications stop responding.
We have a bunch of Cocoon applications [mostly 2.0.4] running on JBoss3.0.7.
It is totally unclear which application is causing the problem.
I don't remember that problem happening in our Development or Testing
environment
(where max JavaVM=512MB), but I guess it has a much lighter load.
Is there any known memory problem with Cocoon ?
Is there a way to do memory profiling of Cocoon Apps ? Any particular tool ?
(I have done memory profiling of Java applets with JProbe years ago)
Any advice is very appreciated.
Thank you in advance,
Oleg.