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> From: Christopher Schultz [mailto:ch...@christopherschultz.net]
> Subject: Re: Tomcat 100% CPU usage after moving from Java 5 to 6
>
> It's interesting that there's no timing data for that last statement.
> It /is/ possible this is where the JVM went down. (Did
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Jesse,
On 2/2/2010 3:23 AM, Jesse Klaasse wrote:
> Christopher Schultz-2 wrote:
>>
>> Can you give us a timestamp for when the trouble started? Reading GC
>> output is pretty tedious.
>>
>
> I believe the trouble started around 15 - 20 minutes before
>
> Well, as I said, Tomcat is working much more stable now than it did before.
> However, once in a few days it still becomes unresponsive, while CPU usage
> stays incredibly low.
Unresponsive, meaning what, exactly? If the CPU is idle, but your
webapp isn't returning a response... it seems to i
s predictable/repetitive) traffic on
the production environment, I guess..
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Jesse,
On 2/1/2010 5:22 AM, Jesse Klaasse wrote:
>
> In the meantime, the environment has been much more stable than it was before
> the move to Java 6 and the new JVM options. However, a few minutes ago,
> Tomcat became completely unresponsive, whil
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2010/1/26 Leon Rosenberg
> Another customer of mine was playing with gc settings for nearly a
> year, because his tomcats collection times went higher and higher, and
> after a short look at the heap dump with jmap and jhat, we found out
> that he had 100.000.000 uncollectable garbage objects in
On Tue, Jan 26, 2010 at 4:50 PM, Jesse Klaasse wrote:
>
> Hi Chuck, thanks for your extensive comments about the JVM options..
>
On a site note... I have made the observation that the JVM is
performing best without any explicit gc settings. Most time explicit
GC settings just cause havoc (fixes s
usage is as low as it is now,
I have decided to give it a try.
Anyway, thanks again!
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> From: Jesse Klaasse [mailto:jesse.klaa...@indicia.nl]
> Subject: Re: Tomcat 100% CPU usage after moving from Java 5 to 6
>
> I found the following article particularly useful:
> http://confluence.atlassian.com/display/DOC/Garbage+Collector+Performance+Issues
Unfortunately, tha
in JDK
6:
http://java.sun.com/javase/technologies/hotspot/vmoptions.jsp
I thought, I'd just let you all know!
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Jesse Klaasse wrote:
I have now fixed the infinite loop, and again did the update from Java 5 to
Java 6. This time all seems to be working like a charm!
Along with fixing the infinite loop, I have dug a little deeper into the JVM
arguments. I found the following article particularly useful:
http
led flag?
So, still some research to be done.
In the meantime I am very pleased with the results. Tomcat's CPU usage seems
significantly lower than before (it's average seems about 10% now - which
was 30-40% before) - scary!
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Jesse,
On 1/25/2010 8:25 AM, Jesse Klaasse wrote:
> I don't know what you mean exactly by "re-intrant"
Re-entrant (never seen it as "re-intrant") means that more than one
thread of execution might be running the same code concurrently. I've
never hea
Jesse Klaasse wrote:
Hi Leon,
I don't know what you mean exactly by "re-intrant", but your comment points
out I have created an endless while-loop! Apart from moving to Java 6, I had
commented out some lines to reduce logging, not noticing I had created an
endless loop by doing so. I only did th
Jesse Klaasse wrote:
...
ctory -Dcom.sun.management.jmxremote -XX:MaxPermSize=512m
-Xloggc:D:\logs\gc\tomcat-gc.log -XX:+PrintGCDetails -XX:+UseParNewGC
-XX:+UseConcMarkSweepGC -XX:+UseTLAB -XX:+CMSClassUnloadingEnabled
-XX:+CMSPermGenSweepingEnabled -Xms4096m -Xmx10240m
Apart from your basic
intln("Workflow/doAction: oid=" +
> ((ObjectId)oidIterator.next()).getKey());
> }
> and you are modifying this vector at multiple places in the same class.
>
> You should probably unit-test this code for concurrency.
>
> regards
> Leon
>
va 4
>> and 5?
>>
>
> I forgot the attachments, sorry!
> http://old.nabble.com/file/p27306041/DQWorkflow.java DQWorkflow.java
> http://old.nabble.com/file/p27306041/Workflow.java Workflow.java
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s are from our company, written by the
programmer who worked on this project before me. I have attached the two
files for further examination.
I have noticed the performWorkflowAction method in DQWorkflow is not
synchronized and uses Vectors and Iterators. Could this be a possible
problem? Even though
I'm not sure how to
interpret it correctly), and it's overwritten when Tomcat is restarted, so
there's really nothing I can say about that. Do you suspect any problems
there?
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P.S. Your tomcat is writing gc logs, please attach them next time.
On Mon, Jan 25, 2010 at 12:31 PM, Leon Rosenberg
wrote:
> take a look on threads
> ajp-8009-2
> ajp-8009-18
> ajp-8009-30
> ajp-8009-38
>
> they are all seem to be either in an infinite loop:
> at java.util.AbstractList$Itr
take a look on threads
ajp-8009-2
ajp-8009-18
ajp-8009-30
ajp-8009-38
they are all seem to be either in an infinite loop:
at java.util.AbstractList$Itr.hasNext(AbstractList.java:339)
at
nl.indicia.vip.framework.util.Workflow.performWorkflowAction(Workflow.java:166)
at
nl.
On 25/01/2010 11:08, Jesse Klaasse wrote:
I am running a production environment for a website (over half a million
hits per day), using Tomcat 5.5.20 (I'm stuck to that version due to
support restrictions) behind IIS 6 using JK connector 1.2.28,
tcnative-1.dll (1.1.19) on Windows Server 2003 R2 E
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