Hi Peter,
I think OS ran out of room while allocating memory for threads.
I am using thread stack size as -Xss128k
and when i do
ulimit -s on linux it shows 10240.
Increasing ulimit for thread will help???
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Yes that's correct Peter,
I am running jmap with same account under which Jboss is running.
That's a good idea to run with hello world first.
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Be sure that you aren't using the jmap tool from an JDK 1.6 installation
(unlikely but thought it was worth mentioning).
http://www.j2ee.me/javase/6/webnotes/trouble/other/matrix5-Unix.htm talks about
Java SE 5.0 update 14 supporting -XX:+HeapDumpOnCtrlBreak option. I haven't
tried this but ma
It might help. But you really first need to find out where the threads are
being allocated, and especially for JBoss AS ask yourself if you really need as
many threads as you are allocating.
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Each thread uses 1MB of memory (at least, I think that is the default - it
keeps on changing and is different for each OS) - looks like you ran out of
available memory (there is also the possibility that the OS ran out of room
within its memory area to allocate another thread). You could try red
Now i got following exception in Jboss server log.
| 2009-06-29 03:48:04,732 ERROR [org.jgroups] uncaught exception in
Thread[PingWaiter,5,JGroups threads] (thread
group=org.jgroups.util.Util$1[name=JGroups threads,maxpri=10] )
| java.lang.OutOfMemoryError: unable to create new native threa
Peter,
The hello world heap dump is working Thanks!, I will run the jmap again for
jboss process and will wait to see how long it takes,
My Heap size is 1G, i think it will take at least 10-15 mins to dump that.
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Are you running jmap with the same account under which JBoss AS is running?
Also, it might take a while to dump a large heap. If none of that helps, try
dumping a simple hello world java app and see if that works.
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I am not using JDK 1.6, I am using JDK 1.5 update 12..
I have already added the option XX:+HeapDumpOnOutOfMemoryError, and for this i
will have to wait for OutOfmemory exception, but for running process how to get
the heap dump?
Should i consider to upgrade to JDK 6?
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I tried to run jmap utility to get the heap dump using following command
jmap -heap:format=b
However after running following command it says
Attaching to process ID , please wait...
and just hung, no output after that.
I am running it on RHEL 4 using JDK 1.5.0_12-b04
is there anything am i mi
At the moment, my favorite OSS tool for finding memory issues is
http://www.eclipse.org/mat/
Basically, you generate a heap dump and run the eclipse memory analyzer against
it. You will get a report of the likely suspects and can view the contents of
any memory variable.
View the original p
Also i have taken the screen shot from gcviewer which is easier to look at.
| http://66.39.39.38/GC_Running.PNG
| http://66.39.39.38/GC_Dead1.PNG
| http://66.39.39.38/GC_Dead2.PNG
|
Thanks
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Hi Peter,
Thanks for your input.
I am using JDK6 VisualVM as well as JConsole utility to monitor, however
VisualVM does not keep old heap analysis, it gives you analysis for last 1-2
hrs only.
Jconsole at least gives all the data, if you keep it running, though it does
not record.
And if it we
Looks like you have a memory leak - look at the heap size after each GC. Also,
with setting the young gen to 400M, you will end up running a major collection
if you have more that around 600MB heap in use - once you crossed that magic
barrier you get nothing but full GCs.
You will need to monit
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