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Heap Dump Problem WebSphere Application Server 6.0

 
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Hi Friends

Initial Heap Size 512 MB
Maximum Heap Size : 4 GB
System Ram Size : 8 GB

Heap dump files are generating 2 days once in production server . we are not able to trace the root cause ,we dont know wheather our program problem or application server settings problem

we are getting OutOfMemory in SysErr.log but we dont find any error or exceptions in SystemOut.log

Error Msg :


Thanks
Arunkumar S
 
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Not much I can say, I'm afraid, without seeing javacore* and heapdump* files.

What WebSPhere version are you running exactly (run the wasversion script to get that data) The first and most obvious step, then, is to make sure you're on the latest fixpack.

Also, there is often useful informatoin in the FFDC logs. I suggest you sort them by date modified to find the useful ones.

I also suggest you turn on verbose GC to assure that you are not just legitimately running out of heap space.

It APPEARS that this is happening on a new TCP/IP Socket connection (to be clear, this is a guess), so I would concur with conclusions I've seen you make in another forum that this may well be an app server problem. Are you running Stand-alone WAS and running against the web container within the app server?


 
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This has very good advice on how to diagnose and fix memory problems

http://publib.boulder.ibm.com/infocenter/wasinfo/v6r1/index.jsp?topic=/com.ibm.websphere.express.doc/info/exp/ae/ttrb_mdd4j.html

I've found it useful in finding the problem.
 
Arunkumar Subramaniam
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hi friends

i got native_stderr and native_stdout files when Generating a heap file .but there is only out of memory error information, no other information for analyze

native_stderr.log
-----------------
JVMDG217: Dump Handler is Processing OutOfMemory - Please Wait.
JVMDG315: JVM Requesting Heap dump file
JVMDG318: Heap dump file written to C:\IBM\WebSphere\AppServer\profiles\default\heapdump.20090411.121853.7196.phd
JVMDG303: JVM Requesting Java core file
JVMDG304: Java core file written to C:\IBM\WebSphere\AppServer\profiles\default\javacore.20090411.121858.7196.txt
JVMDG274: Dump Handler has Processed OutOfMemory.
JVMST109: Insufficient space in Javaheap to satisfy allocation request
JVMDG217: Dump Handler is Processing OutOfMemory - Please Wait.
JVMDG315: JVM Requesting Heap dump file
JVMDG318: Heap dump file written to C:\IBM\WebSphere\AppServer\profiles\default\heapdump.20090411.121918.7196.phd
JVMDG303: JVM Requesting Java core file
JVMDG304: Java core file written to C:\IBM\WebSphere\AppServer\profiles\default\javacore.20090411.121923.7196.txt
JVMDG274: Dump Handler has Processed OutOfMemory.
etc..
---------------------------

native_stdout.log (only dots(.) )
--------------------------
...............................................................................
................................................................................


Download Log File
------------
http://www.ibm.com/developerworks/forums/servlet/JiveServlet/download/266-264378-14266301-339718/heap%20log.zip

 
Steve Wink
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What about this line:

"JVMDG318: Heap dump file written to C:\IBM\WebSphere\AppServer\profiles\default\heapdump.20090411.121918.7196.phd "

That file should have the information that you need, or one of the other .phd files.
 
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