7 Replies Latest reply on Mar 11, 2014 5:51 AM by abhinavshrivastav

    Non - Heap space increasing

    abhinavshrivastav
    abhinavshrivastav Feb 24, 2014 9:58 AM

      We have hosted our application on JBOSS AS 7.1.2 and the profiling shows that Non Heap space is continuously increasing over time.

      I want to know what can be done to diagnose the problem and solution to it.

        • 1. Re: Non - Heap space increasing
          wdfink
          wdfink Feb 24, 2014 11:24 AM (in response to abhinavshrivastav)

          Could you analyze which classes need most of the space?

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          • 2. Re: Non - Heap space increasing
            abhinavshrivastav
            abhinavshrivastav Feb 24, 2014 12:11 PM (in response to wdfink)

            Can i do this analysis with Jconole or visual vm?

             

            If we narrow it down to some classes, what are the next steps we could take?

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            • 3. Re: Non - Heap space increasing
              wdfink
              wdfink Feb 25, 2014 11:45 AM (in response to abhinavshrivastav)

              You can dump it with jmap -dump:format=b,file=x and to analyze you might use visialvm or java profiler.

               

              If you identify classes you might check JIRA whether you find issues, i.e. REM3-171.

              If there is a solution you might pick the component with the fix and change the module. That might not work all the time as there might be API changes.

              The other option is to switch to a server version where this component is included.

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              • 4. Re: Non - Heap space increasing
                abhinavshrivastav
                abhinavshrivastav Feb 26, 2014 5:58 AM (in response to abhinavshrivastav)

                Okay. We will try that and find out if we can find which class takes the maximum of space

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                • 5. Re: Non - Heap space increasing
                  abhinavshrivastav
                  abhinavshrivastav Feb 28, 2014 6:54 AM (in response to abhinavshrivastav)

                  We took a heap dump for the application running. The maximum space is taken by class org.jboss.modules.ModulesClassLoader. We analyzed the heap dump using Memory Analyzer Tool. In a leaked report, it points to two suspects. How do we identify what is causing the NON-HEAP space to increase.

                   

                  6,904 instances of "java.lang.ref.Finalizer", loaded by "<system class loader>" occupy 167,651,984 (36.18%) bytes.

                   

                   

                  Keywords

                  java.lang.ref.Finalizer

                   

                  AND

                   

                  305 instances of "org.jboss.modules.ModuleClassLoader", loaded by "sun.misc.Launcher$AppClassLoader @ 0x40001a598" occupy 36,307,664 (12.15%) bytes.

                   

                   

                  Biggest instances:

                  •org.jboss.modules.ModuleClassLoader @ 0x400d00f00 - 16,237,392 (5.43%) bytes.

                  •org.jboss.modules.ModuleClassLoader @ 0x401123010 - 9,325,864 (3.12%) bytes.

                   

                   

                   

                   

                  Keywords

                  sun.misc.Launcher$AppClassLoader @ 0x40001a598

                  org.jboss.modules.ModuleClassLoader

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                  • 6. Re: Non - Heap space increasing
                    abhinavshrivastav
                    abhinavshrivastav Mar 4, 2014 8:57 AM (in response to abhinavshrivastav)

                    One more pattern that I observed was that there are too many sun.reflect.DelegatingClassLoaders as well. We are using JDK java 1.6.0_27-b07 along with JBOSS AS 7.1.2

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                    • 7. Re: Non - Heap space increasing
                      abhinavshrivastav
                      abhinavshrivastav Mar 11, 2014 5:51 AM (in response to wdfink)

                      Any update or any further information on this one?

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