OOM PermGen... How to view the content of permgen
I have a pretty big java application running on windows and linux (redhat) using JBoss as the application server.
The application has been running for a long time without issues and now, with the end of a new release of our software, under heavy load, we are running out of perm gen space.
What I would like to see is a tool that lets me view the content of the perm gen space so I can determine why we are using so much memory.
I am aware of jmap -permstat (on linux only) that should let you view some info about permgem but for me, jmap connects to the java process and never comes back. I tried a profiler (jprofiler) and again, I can't find info about what is occupying the permgen memory space.
Can someone suggest tools, or methods to get to the content of the permgen space so I can determine what our issue is?
Here are our startup options; as you can see it has been tuned quite a bit for maximum performance for our usage patterns.
I would appreciate any help chasing down this issue.
Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_02-b05, mixed mode)
-Xms8000m
-Xmx8000m
-Xss256k
-XX:PermSize=256m
-XX:MaxPermSize=256m
-Xmaxjitcodesize96m
-XX:+UseParNewGC
-XX:+HandlePromotionFailure
-XX:ParallelGCThreads=16
-XX:GCHeapFreeLimit=10
-XX:NewRatio=3
-XX:SurvivorRatio=2
-XX:InitialSurvivorRatio=2
-XX:MinSurvivorRatio=2
-XX:GCTimeRatio=19
-XX:MaxTenuringThreshold=128
-XX:TargetSurvivorRatio=90
-XX:+ClassUnloading
-XX:ErrorFile=hs_err_<pid>.log
-XX:HeapDumpPath=java_<pid>.hprof
-XX:-HeapDumpOnOutOfMemoryError
jklopkjl wrote:
Hi i am using oracle 10g .How to view the content of the stored procedure or trigger ?
query ALL_SOURCE
SQL> desc all_source
Name Null? Type
OWNER VARCHAR2(30)
NAME VARCHAR2(30)
TYPE VARCHAR2(12)
LINE NUMBER
TEXT VARCHAR2(4000)
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hi,
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http://service.sap.com/notes
But you require SMP login ID for this which you should get from your company. The content of the notes are as follows:
Reason and Prerequisites
You are looking for additional parameter settings. There are two possible reasons why a feature is available via the "additional parameters" table in the "advanced mode" section of the configuration, but not as documented parameter in the configuration UI itself:
Category 1: The parameter has been introduced for a patch or a SP upgrade where no UI upgrade and/or documentation upgrade was possible. In this case, the parameter will be moved to the UI and the documentation as soon as possible. The parameter in the "additional parameters" table will be deprecated after this move, but still be working. The parameter belongs to the supported adapter functionality and can be used in all, also productive, scenarios.
Category 2. The parameter has been introduced for testing purposes, proof-of-concept scenarios, as workaround or as pre-released functionality. In this case, the parameter may or may not be moved to the UI and documentation, and the functionality may be changed, replaced or removed. For this parameter category there is no guaranteed support and usage in productive scenarios is not supported.
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Parameter names are always case-sensitive! Parameter values may be case-sensitive, this is documented for each parameter.
Parameter names and values as documented below must be used always without quotaton marks ("), if not explicitly stated otherwise.
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JDBC Receiver Adapter Parameters
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Category: 2
Description:
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Regards,
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