rtsched_numpri(5)                                         rtsched_numpri(5)
                          Tunable Kernel Parameters



 NAME    [Toc]    [Back]
      rtsched_numpri - number of priority values to support for POSIX.1b
      realtime applications

 VALUES    [Toc]    [Back]
    Failsafe
      32

    Default    [Toc]    [Back]
      32

    Allowed Values    [Toc]    [Back]
      Any value in the range of 32 to 512 is allowed.  A value lower than 32
      is reset to 32, whereas a value higher than 512 is reset to 512.

    Recommended Value    [Toc]    [Back]
      32

 DESCRIPTION    [Toc]    [Back]
      The rtsched_numpri tunable defines how many priority values to support
      for POSIX 1.b realtime applications.  A larger value provides
      additional flexibility to applications in managing relative priorities
      of all threads with respect to each other and with respect to other
      applications running in the system.  However, a larger value adds
      processing overhead in the operating system in terms of managing
      larger run queues with the possibility of increased search times.

    Who Is Expected to Change This Tunable?
      Anyone.

    Restrictions on Changing    [Toc]    [Back]
      Changes to this tunable take effect at next reboot.

    When Should the Value of This Tunable Be Raised?
      When the system is primarily running POSIX realtime applications, and
      requires additional flexibility in managing relative priorities of
      applications.

    What Are the Side Effects of Raising the Value?
      Raising the value of the rtsched_numpri tunable may cause some
      operating system overhead due to larger and possibly more sparse run
      queues.

    When Should the Value of This Tunable Be Lowered?
      The default value of the rtsched_numpri tunable is already set to the
      minimum possible value.

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





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






 rtsched_numpri(5)                                         rtsched_numpri(5)
                          Tunable Kernel Parameters



 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]
      rtsched_numpri was developed by HP.


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