maxuprc(5)                                                       maxuprc(5)
                          Tunable Kernel Parameters



 NAME    [Toc]    [Back]
      maxuprc - limits the maximum number of concurrent user processes per
      user

 VALUES    [Toc]    [Back]
    Failsafe
      256

    Default    [Toc]    [Back]
      256

    Allowed values    [Toc]    [Back]
      Between 3 and (nproc -5).

    Recommended value    [Toc]    [Back]
      256

 DESCRIPTION    [Toc]    [Back]
      maxuprc is a dynamic tunable that limits the maximum number of
      processes per user.  Only root can have more than the number of
      processes limited by maxuprc.

    Who is Expected to Change This Tunable?
      System administrators can change the value of maxuprc depending on the
      usage of the system.

    Restrictions on Changing    [Toc]    [Back]
      None.  This tunable is dynamic.

    When Should the Value of This Tunable Be Raised?
      The value of maxuprc should be changed if users require more processes
      than what they are currently allowed by maxuprc.  If fork() fails with
      an error value of [EAGAIN], it could be an indication that maxuprc was
      reached by that particular user.  However, that is not the only reason
      that could cause fork() to fail with an errno value of [EAGAIN].
      [EAGAIN] may be returned if nproc system tunable has been reached or
      memory on the system has been exhausted.

    What Are the Side Effects of Raising the Value?
      Raising the value of maxuprc allows a single user to consume a greater
      percentage of the system resources.

    When Should the Value of This Tunable Be Lowered?
      The value of maxuprc should be lowered when individual users are
      monopolizing system resources by running too many concurrent
      processes.

    What Are the Side Effects of Lowering the Value?
      Applications that depend on a large number of processes may behave
      differently or fail.  Existing processes will continue to run but new
      process creations which would result in the user exceeding maxuprc



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






 maxuprc(5)                                                       maxuprc(5)
                          Tunable Kernel Parameters



      will fail.

    What Other Tunable Values Should Be Changed at the Same Time?
      When tuning maxuprc you should keep in mind the value of nproc.

 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]
      maxuprc was developed by HP.

 SEE ALSO    [Toc]    [Back]
      nproc(5).


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