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Frequent heap dumps and system load average

Dear Experts,

Performance of our development has gone worst. There has been frequent Heap Dumps and Paging, also System Load Average '/Kernel/SAPJVM/SystemProblemReporting/System Load Average' is over 133%.

We are using NW731 with EP core.

JVM parameters arememory are according to SAP recommendations

-Xms4096m

-Xmx4096m

-XX:NewSize=1365m

-XX:MaxNewSize=1365m

-XX:PermSize=1024m

-XX:MaxPermSize=1024m

-XX:NewRatio=6

SCS, Application and Database are on single host.

Number of nodes=2.

Physical memory size is 15GB

Appreciate your assistance in analyzing and fixing the performance issue.

Thanks,

Kumar

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3 Answers

  • Posted on May 08, 2014 at 12:41 PM

    Hi Kumar,

    I would suggest you to take 7-8 thread dumps in interval 10 15-20 sec when the utilization is high. Then find and map the corresponding Kernel ID with Thread ID of the processes causing high utilization. Also, use MAT for HEAP dumps to find problem in heaps, check for leaking loaders and memory leaks.

    Regards,

    Divyanshu

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  • author's profile photo Former Member
    Former Member
    Posted on May 08, 2014 at 01:28 PM

    Hi Balaji,

    Please try to generate heap hprof dump, by adding below parameters in configtool

    -XX:+HeapDumpOnOutOfMemoryError

    -XX:+HeapDumpOnCtrlBreak

    And after generating hprof file you can analyze it using memory analyzer.

    Regards,

    Jitendra

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  • Posted on May 23, 2014 at 01:57 PM

    Hi Divyanshu,


    Either zip or direct thread dump format b00 is not supported for attaching. OOM and java_PID**** files are more than 4 GB in size.....

    Is there any other way to send the files....

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