DX Application Performance Management

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  • 1.  Difference between Thread count and no. of threads in thread dump

    Posted Dec 21, 2015 06:08 AM

    Hi,

    I could find difference between the actual thread count and the thread count in thread dump. How to interpret both of them. Thread count shows value around 7K and in thread dump, we couldn't find all the references of the 7000 threads. Please find the screenshots of both below. Please assist.

     

    Actual Thread Count

     

    Thread dump from Introscope



  • 2.  Re: Difference between Thread count and no. of threads in thread dump

    Broadcom Employee
    Posted Dec 21, 2015 07:34 AM

    Hi,

     

    I can't see the full metrics name for "Active Threads". Where is that metrics coming from. It may be the case that it is incremented when a new thread is created but never decremented. Can you show it over a longer time period (from server start)?

     

    Ciao,

    Guenter



  • 3.  Re: Difference between Thread count and no. of threads in thread dump

    Posted Dec 21, 2015 12:37 PM

    Kindly open a support issue and provide thread dumps, agent logs and other necessary details.

    There have been bugs around Thread monitoring that were addressed in later versions making count reported by Agent more accurate vs. thread dumps.

     

    Regards,

    Kulbir.



  • 4.  Re: Difference between Thread count and no. of threads in thread dump

    Posted Dec 22, 2015 01:38 AM

    Hi Kulbir,

    Which is the accurate one, actual thread count reported or the thread dump. We are using version 9.5.



  • 5.  Re: Difference between Thread count and no. of threads in thread dump
    Best Answer

    Posted Dec 22, 2015 01:07 PM

    Hi,

    Of course count of threads reported in the thread dump is accurate and based on timing there could be little difference in count between agent and actual dump, but not as much as you are seeing which is definitely a bug. A bug was addressed in 9.5.3 and higher versions for active threads count so I would recommend upgrading to at least 9.5.3 Agent (compatible with 9.5.x EM) and see if that addresses the issue. If not kindly open a support issue so we can track it further.

     

    I am marking this issue as solved now.

    Regards,

    Kulbir.



  • 6.  Re: Difference between Thread count and no. of threads in thread dump

    Posted Jan 11, 2016 06:24 AM

    Hi,

    I did research on the thread count and thread dump. We are using 9.5.5.0 version of wily. I could see a differencial behavior of Performance and Production environment. In Performance, there is only nominal difference between the thread count and thread dump but in Production we can see a huge difference.

     

    For eg. Performance shows activemq thread count as only 40 and Production shows the count as 15000 for the same thread though the code in performance and production is same. Also same version of wily exists in both the environments.

    Please help in analysis.



  • 7.  Re: Difference between Thread count and no. of threads in thread dump

    Broadcom Employee
    Posted Jan 11, 2016 07:54 AM

    Hi ppval:

       For a detailed analysis, do as Kulbir suggests above and open a case providing what he recommended.

     

    Thanks

    Hal German



  • 8.  Re: Difference between Thread count and no. of threads in thread dump

    Posted Dec 22, 2015 01:34 AM

    Hi Guenter,

    Sharing the screenshot for 7 days period. The count shows it has increased over successive period. But when we tried to analyse as to why its increasing we couldn't find the exact no. of threads in the thread dump. The version we are using is 9.5. Is it a bug and if it is, any other way we can analyse the threads. Please assist.