dnlc_hash_locks man page on HP-UX

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dnlc_hash_locks(5)					    dnlc_hash_locks(5)

       dnlc_hash_locks	-  number of locks for the Directory Name Lookup Cache

   Allowed values
       The minimum value allowed is The maximum value allowed is The value  is
       further	constrained in that it must be be a power of 2, and it must be
       equal to or less than one-eighth the number of DNLC entries  Specify  a
       positive integer value.

       To  speed  up  the search through directories in the kernel, there is a
       memory resident cache of	 directories  called  the  During  a  filename
       lookup in the kernel, any directories or files encountered are retained
       in the DNLC for future reference.  The  DLNC  is	 managed  in  a	 Least
       Recently	 Used  fashion.	  The  dictates the number of lock groups that
       will be used to manage the directory entries in the DNLC hash chains.

   Who Is Expected to Change This Tunable?
       HP-UX system administrators.

   Restrictions on Changing
       This tunable is static.	Any changes  to	 the  value  of	 this  tunable
       require a system reboot before taking effect.

   When Should the Value of This Tunable Be Raised?
       The  value  may need to be raised to reduce lock contention and improve
       filename lookup performance when	 running  applications	which  require
       large numbers of file name accesses.

   What are the Side Effects of Raising the Value?
       More system memory will be consumed to allocate locks for the DNLC.

   When Should the Value of This Tunable Be Lowered?
       The value can be lowered to limit the number of locks allocated for the
       DNLC and to reduce memory consumption.

   What are the Side Effects of Lowering the Value?
       Less system memory will be consumed for	the  DNLC  locks  upon	system
       reboot.	 Operations  requiring	filename  lookup  (for	example,  (see
       open(2)) may experience performance degradation.

   What Other Tunable Values Should Be Changed at the Same Time?
       The value of must be equal to or greater than eight times the value of

       All HP-UX kernel tunable parameters are release specific.  This parame‐
       ter  may	 be  removed or have its meaning changed in future releases of

       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

       was developed by HP.

       kctune(1M), smh(1M), gettune(2), settune(2).

			   Tunable Kernel Parameters	    dnlc_hash_locks(5)

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