fcache_async_cache_invalidate man page on HP-UX

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fcache_async_cache_invalidate(5)	      fcache_async_cache_invalidate(5)

       fcache_async_cache_invalidate  -	 toggle the deferred freeing of cached

   Allowed values
   Recommended Values
       Default value

       The tunable is used to toggle the deferred freeing of cached pages.  By
       default, this tunable is set to 1; in other words. it is turned ON, and
       the freeing of cached pages is deferred.

       When this tunable is set to a value of 1, the system will try to	 asyn‐
       chronously  free pages from the cache that are in use by files that are
       being removed via the rm(1) command, or those pages that are  in	 cache
       that  are being used by the file systems and are being released via the
       umount(1) command.

       When this tunable is set to a value of 0, the  system  will  free  such
       pages from the cache synchronously.

   Who Is Expected to Change This Tunable?
       Administrators  investigating  the  performance characteristics of file
       I/O intensive workloads.

   Restrictions on Changing
       Changes to this tunable take effect immediately.

   When Should the Value of This Tunable be changed?
       Leaving this tunable at its default value of 1 improves performance  in
       work loads where large amounts of files are being removed regularly, or
       in cases where file systems are being unmounted.	 However, setting this
       value  to  1  leaves the free pages in such a state as to cause them to
       exist as smaller contiguous chunks.

       Applications starting up after an rm(1) or a  umount(1)	operation  may
       use  up smaller translations and incur a higher TLB miss penalty, espe‐
       cially if the pages just released represent a sizable  portion  of  the
       free memory in the system.

       Change  this  tunable value to 0 only if there appears to be an adverse
       impact on application startup times, and if performance in paths	 where
       pages are being freed back to the system are not of much concern.

   What Other Tunable Values Should Be Changed at the Same Time?

       An invalid value is entered that is not an integer and is not 0 or 1,
		      such as a negative number.

       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.

			   Tunable Kernel Parafcache_async_cache_invalidate(5)

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