[HPADM] Performance problems

From: Unternaehrer Stefano (stefano.unternaehrer_at_ti.ch)
Date: 10/09/03

  • Next message: Stocker, Nick: "[HPADM] HP D390 Server and V20 problem" 
    To: HP-UX Admin <hpux-admin@dutchworks.nl>
Date: Thu, 9 Oct 2003 16:27:52 +0200

    Hi all.
    Our webserver still suffers with performances.
    This A500 server is running HP-UX 11.00 with a
    webserver using TomCat3 (JSP - Java Servlets),
    JVM 1.1, reading on a remote Oracle database.
    I've installed all recent patches, and changed
    some kernel parameters:

     dbc_max_pct 8
     dbc_min_pct 8
     max_thread_proc 256
     maxuprt 300
     nproc 1620

    I see following CPU state with top:

     LOAD USER NICE SYS IDLE BLOCK SWAIT INTR SSYS
     1.99 71.6% 0.0% 28.4% 0.0% 0.0% 0.0% 0.0% 0.0%

    and with glance following memory usage
    (current / avg / high):

     Mem Util ........ 100% 100% 100%
     Swap Util ........ 50% 50% 50%

    In the glance process list I can see java with a value
    of 735MB (!!) on column RSS. RAM used by the JVM?
    Also the shell prompt reaction is slow!

    The command /usr/contrib/Q4/bin/kmeminfo.11.00
    give me following output:

    Physmem = 262144 Available physical memory:
     Freemem = 332 Free physical memory
     Used = 261812 Used physical memory:
      System = 48904 by kernel:
       Static = 10701 for text and static data
       Dynamic = 17232 for dynamic data
       Bufcache = 20971 for file-system buffer cache
      User = 212005 by user processes
       Uarea = 2869 for thread uareas
      Disowned = 512 disowned pages

    I suppose we have to add memory (2GB now), but better
    we have to find where memory is bad used. In java code,
    we never set a java object to null (in our jsp source)
    after usage. This could help garbage collector to know
    that this object can be lost and free memory before to
    end the execution of the servlet... But really don't
    know if this could be the cause of our problems..

    Any opinion?

    Best regards,
    Stefano Unternaehrer 

    ---
Stefano Unternaehrer
SysAdmin/WebMaster Sbt
Sistema bibliotecario ticinese
www.sbt.ti.ch - 091 814 15 13
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  • Next message: Stocker, Nick: "[HPADM] HP D390 Server and V20 problem"

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