[HPADM] [SUMMARY] Performace problems

From: Unternaehrer Stefano (stefano.unternaehrer_at_ti.ch)
Date: 10/15/03

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    To: HP-UX Admin <hpux-admin@dutchworks.nl>
Date: Wed, 15 Oct 2003 12:12:06 +0200

    Thank you to all of you,
    Quinn, Bryan [Bryan.Quinn@CooperTools.com]
    Ilan Green [ilang@amdocs.com]
    Abramson, Stuart [SAbramson@Wabtec.com]
    Thierry ITTY [thierry.itty@besancon.org]
    Bill Hassell [blhconsulting@mindspring.com]
    mike.keighley@adarelexicon.com
    Dave Ritchie [deritchie@yahoo.com]
    Anil Rajapure [anil_unix1975@yahoo.com]

    Question was:
    > Our webserver still suffers with performances.
    > This A500 server is running HP-UX 11.00, 1GB RAM,
    > webserver TomCat3 (JSP - Java Servlets), JVM 1.1,
    > reading on a remote Oracle database through
    > the firewall.

    I received lot of useful suggestions:

    - install all neded patches (but all attempts to
      download patches from http://www4.itrc.hp.com/
      gave me corrupted files..);
    - install JVM 1.4
    - install Tomcat4
    - install glance
    - define PTHREAD_DISABLE_HANDOFF=ON
      (not tried, see PHCO_29108 for description)
    - do some tuning on the hp-ux kernel:
      dbc_min_pct, dbc_max_pct, vps_ceiling,
      max_thread_proc, maxuprc, nproc
    - do some tuning on the jvm usage:
      -Xms, -Xmx, -Xincgc
    - start java with: rtprio <priority> java
      (this worked with TomCat3, ignored with TomCat4)
    - do some tuning on tomcat:
      max_threads, min_spare_threads, max_spare_threads
    - enable the java verbosegc option and analyse
      the trace files
    - use tools such as HPjmeter, HPjtune, HPjconfig
    - do some tuning on network trafic with ndd,
      tcp_conn_request_max
    - help the garbage collector to free unused
      memory, by setting to null all obsolete objects
      created with a "new Class()" statement
      (not tied, hey, we have a lot of source files..);
    - don't create new objects simply calling the
      constructor, but use instead an object distributor
      which will manage and reuse obsolete objects;
    - have a daemon guardian wich will monitor and
      automatically restart tomcat if it crasches
    - add RAM
    - add CPU
    - use a more powerful server as the A500 :-)
    - ask the network administrator to solve net problems!

    Lot of good idea, I've done most of them. We still have
    some problems, I'm working with the last suggestion :-)
    If you need more detailed informations on some point,
    just write me.

    Thank you and best regards,
    Stefano 

    ---
Stefano Unternaehrer
SysAdmin/WebMaster Sbt
Sistema bibliotecario ticinese
Bellinzona - Switzerland
www.sbt.ti.ch - 091 814 15 13
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