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ncsize(5)							     ncsize(5)

NAME
       ncsize - number of Directory Name Lookup Cache (DNLC) entries

VALUES
   Failsafe
   Default
   Allowed values
       The  minimum  value allowed is The maximum value allowed is memory lim‐
       ited.  The value is further constrained in that it must be equal to  or
       greater than eight times the value of the number of locks for the DNLC

       Specify a positive integer value.

DESCRIPTION
       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 tunable dictates the  number  of
       entries in the DNLC, which is statically allocated at system boot time.
       Therefore, the larger the value of the  larger  the  number  of	direc‐
       tory/file  entries  that	 can  be  kept	cached	in memory for filename
       lookup.

   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  will
       require system reboot before taking effect.

   When Should the Value of This Tunable Be Raised?
       The  value may need to be raised to improve filename lookup performance
       when running applications  which	 require  large	 numbers  of  filename
       access.

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

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

   What are the Side Effects of Lowering the Value?
       Less system memory will be consumed for the DNLC	 upon  system  reboot.
       Operations requiring filename lookup (e.g. open(2)) may experience per‐
       formance 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

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
       kctune(1M), sam(1M), gettune(2), settune(2), dnlc_hash_locks(5).

			   Tunable Kernel Parameters		     ncsize(5)

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