maxtsiz(5)                                                       maxtsiz(5)
                          Tunable Kernel Parameters



 NAME    [Toc]    [Back]
      maxtsiz, maxtsiz_64bit - maximum size (in bytes) of the text segment
      for any user process

 VALUES    [Toc]    [Back]
    Default
      32 bit: 96MB

      64 bit: 1GB

    Allowed values    [Toc]    [Back]
      32 bit minimum: 0x40000

      32 bit maximum: 0x40000000

      64 bit minimum: 0x40000

      64 bit maximum: 0x3FFFFFFFFFF

 DESCRIPTION    [Toc]    [Back]
      User programs on HP-UX systems are composed of five discrete segments
      of virtual memory: text (or code), data, stack, shared, and I/O.  Each
      segment occupies an architecturally defined range of the virtual
      address space which sets the upper limit to their size, but text, data
      and stack segments may have a smaller maximum enforced via the
      maxtsiz, maxdsiz and maxssiz tunables.

      maxtsiz controls the size of the text segment, which is the read-only
      executable object code for the process that can be shared by multiple
      processes executing the same program.  For example, all copies of vi
      on the system use the same text segment.

    Who is Expected to Change This Tunable?
      Anyone.

    Restrictions on Changing    [Toc]    [Back]
      Changes to this tunable take effect immediately.

    When Should the Value of This Tunable Be Raised?
      maxtsiz should be raised if user processes are receiving the [ENOMEM]
      error with the following message:

           exec(2): text exceeds maxtsiz
      or
           exec(2): text exceeds maxtsiz_64bit

    What Are the Side Effects of Raising the Value?
      None.

    When Should the Value of This Tunable Be Lowered?
      This tunable should be lowered if you want to limit the text size of



 Hewlett-Packard Company            - 1 -      HP-UX 11i Version 2: Sep 2004






 maxtsiz(5)                                                       maxtsiz(5)
                          Tunable Kernel Parameters



      running processes, but there is not a system performance reason to do
      so.

    What Are the Side Effects of Lowering the Value?
      None.

    What Other Tunable Values Should Be Changed at the Same Time?
      None.

 WARNINGS    [Toc]    [Back]
      All HP-UX kernel tunable parameters are release specific.  This
      parameter may be removed or have its meaning changed in future
      releases of HP-UX.

      Installation of optional kernel software, from HP or other vendors,
      may cause changes to tunable parameter values.  After installation,
      some tunable parameters may no longer be at the default or recommended
      values.  For information about the effects of installation on tunable
      values, consult the documentation for the kernel software being
      installed. For information about optional kernel software that was
      factory installed on your system, see HP-UX Release Notes at
      http://docs.hp.com.

 AUTHOR    [Toc]    [Back]
      maxtsiz was developed by HP.

 SEE ALSO    [Toc]    [Back]
      maxdsiz(5), maxssiz(5).


 Hewlett-Packard Company            - 2 -      HP-UX 11i Version 2: Sep 2004