How to change a kernel parameter

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nkthread

nkthread(5)							File Formats Manual						       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 low-
       ering 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 tuning 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 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  tun-
       able  values,  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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