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nkthread(5)							   nkthread(5)

NAME
       nkthread - limits the number of threads allowed to run simultaneously

VALUES
   Failsafe
   Default
       or

   Allowed values
       must be greater than

       must be greater than

       This may be set higher, but more will not be used.

   Recommended values
       Unless  there  are  heavily  threaded  applications  on the system, the
       default formula is adequate if is tuned correctly.

DESCRIPTION
       The tunable controls the absolute number of threads allowed on a system
       at any given time.  Increasing it will allow more threads, and lowering
       it will restrict the number of threads.

       It can be determined that is too low when the message is	 seen  in  the
       message	buffer.	 The message can be read via or This message indicates
       that an application was unable to create a thread.  Setting too low can
       cause application failures due to an inability to create new threads or
       fork new processes.

       It can be determined how many threads  have  been  used	simultaneously
       prior  to  the  above  message  by calling and examining the This field
       indicates the "high water" mark of the number of threads that have been
       simultaneously used.

   Who Is Expected to Change This Tunable?
       Anyone expecting to run large numbers of threads.

   Restrictions on Changing
       None.  This tunable is dynamic.

   When Should the Value of This Tunable Be Raised?
       This  value should be increased, either directly or as a result of tun‐
       ing on most systems that are running many threads or processes.

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

   When Should the Value of This Tunable Be Lowered?
       The value should be lowered only to limit the number of threads on  the
       system,	or when there is memory pressure and the value of is far above
       the expected usage.

   What are the Side Effects of Lowering the Value?
       Increased risk of application failure do to the inability to create new
       threads or fork new processes.

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

WARNINGS
       All HP-UX kernel tunable parameters are release specific.  This parame‐
       ter 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 val‐
       ues.  For information about the effects of installation on tunable val‐
       ues, consult the documentation for the kernel software being installed.
       For  information	 about	optional  kernel  software  that  was  factory
       installed on your system, see at

AUTHOR
       was developed by HP.

SEE ALSO
       max_thread_proc(5), nproc(5).

			   Tunable Kernel Parameters		   nkthread(5)

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