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Thread: 8.11 Web - performance issues

  1. #1

    8.11 Web - performance issues

    Hi All,

    I have the following configuration:
    - E1 - 8.11
    - Web Server and Enterprise server are in the same box AS400 V5R3.

    The issue is, after going live we are getting a performance issues and web server instant crashs.

    The question is, Anybody, can share his/her experiance with us by providing any change or recommendation?

    Best regards,
    MO







  2. #2
    Senior Member
    Join Date
    Nov 2000
    Posts
    125

    Re: 8.11 Web - performance issues

    Hello MO,

    I've seen this in two separate customer sites. It seems that when
    WebSphere is installed it has a maximum memory usage of some ridiculously
    high number like 240 GB. When some BSFN (we have yet to determine which
    one or combination of them is causing the grief) is run the memory usage
    starts to climb. You can see this (so long as the web instance is
    responding) as the heap size grows out of control in SAW or using command
    DMPJVM. So WebSphere determines that it needs more memory and increases
    it's heap requirement. The server tries to accommodate this and allocates
    more memory. This goes back and forth until all the memory in your memory
    pool is used up and WebSphere continues to request more thus growing out of
    control. At this point the system is more concerned with administration
    and your web instance freezes and needs to be crashed and restarted before
    anyone can work again.

    The only way we have currently seen to stop this "ballooning" effect is to
    limit the maximum heap size in WebSphere to the maximum you have defined
    for the memory pool. If you have 7GB allocated to the memory pool then set
    your max heap size to 7GB and preferably make it a shared pool.

    Bear in mind that the maximum heap sizes for ALL of your JVM's should not
    total more that what is physically available in the memory pool. So figure
    out how much memory you can allocate to your WebSphere memory pool, make it
    shared and set your JVM Max Heap Sizes in WAS accordingly. Also, end any
    JVM's that you don't need like test JVM's and SERVER1. SERVER1 is only
    required to configure WAS. Normally you can leave it down until you need
    it.

    We have also pressed Oracle on this topic and they have provided a new set
    of .class files for us to try. Since modifying memory usage and installing
    these classes to our JVM's, we have not experienced this balloon.

    Good luck!

    Regards,
    Gerald.





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    8.11 Web - performance issues
    03/30/2006 12:14
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    EnterpriseOne






    Hi All,

    I have the following configuration:
    - E1 - 8.11
    - Web Server and Enterprise server are in the same box AS400 V5R3.

    The issue is, after going live we are getting a performance issues and web
    server instant crashs.

    The question is, Anybody, can share his/her experiance with us by providing
    any change or recommendation?

    Best regards,
    MO








  3. #3

    Re: 8.11 Web - performance issues

    This is really good, detailed information, Gerald.
    Charles Anderson

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