[HPADM] [SUMMARY] Tuxedo Problem

From: Deepak John Cutinha (deepak_cutinha_at_yahoo.com)
Date: 11/03/03

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    Date: Sun, 2 Nov 2003 23:30:42 -0800 (PST)
To: hpux-admin@dutchworks.nl

    Query :

    My Tuxedo developers are gettign this error.
    How do I go about checking for this problem and
    what kernel parameters I need to tweak for thsi.

    Expanation : (Thanks to Bill Hassell The Super Guru )

    This is a LOT more complicated than a simple kernel
    parameter,
    especially if the Tuxedo applications are running as
    32bit programs.

    Start with the Tuzedo docs. They should explicitly
    define the
    required shared memory parameters for all Unix
    systems. Note
    that some applications (like Oracle) can request more
    shared
    memory based on startup configs. Adjust the shared
    memory
    values with SAM.

    Next: all 32bit apps are incapable of addressing more
    than 900megs
    of shared memory without specialized compiler and/or
    chatr options.
    It is possible to address 1.75 Gbytes of shared memory
    with special
    compilation options. Read the details in
    /usr/share/doc on 10.20 and
    11.0 systems, specifically the mem_mgt.txt and
    proc_mgt.txt files.
    These will explain the severe limits for 32bit apps
    (all limits
    disappear with 64bit programs).

    Finally: 32bit apps must share a single address space
    with all other
    other 32bit apps, so it is easy to run out of space or
    to have severe
    fragmentation due to programs starting and stopping.
    The solution for
    32bit programs is to use memory windows. In that same
    directory, read
    the file mem_wndws.txt(btw, I cud not find this file)
    for details. You'll likely need patches to enable
    memory windows. You'll also need the shared memory
    mapper program
    from
    ftp://contrib:9unsupp8@hprc.external.hp.com/sysadmin/programs

    We are now in the prcess of upgrading to 64-bit... ;-)

    Thanks David Lodge for your pointers.

    br,

    Deepak Cutinha

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