max_mem_window man page on HP-UX

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max_mem_window(5)					     max_mem_window(5)

NAME
       max_mem_window  -  maximum number of group-private 32-bit shared memory
       configurable by users

VALUES
   Default
   Allowed values
DESCRIPTION
       Processes in a PA-RISC 32-bit architecture  usually  share  the	global
       quadrants  3  and  4 for such things as I/O mappings, shared libraries,
       shared mapped files, and so on.	However, you may wish to use  quadrant
       3  in  a	 more limited sharing fashion with only a select group of pro‐
       cesses.	Memory windows allow this functionality.

       If this tunable is set to 32-bit programs always use the global Q3  and
       Q4  for	shared	memory.	  If this tunable is greater than processes in
       defined groups use a Q3 private to that group, and  then	 the  globally
       shared Q4 if Q3 is full.

   Who is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect immediately.

   When Should the Value of This Tunable Be Raised?
       This tunable should be raised if more group-private Q3 areas are needed
       by the users of the system.  Each memory	 window	 in  active  use  will
       require	approximately  1Mb of kernel memory.  Windows no longer in use
       will have this memory reclaimed by the system as is feasible.

   What Are the Side Effects of Raising the Value?
       A little more memory is used in the kernel.

   When Should the Value of This Tunable Be Lowered?
       If process groups are not being used, or not being used in the quantity
       set  by	the  tunable,  there  is  really no point to having this value
       higher than what is actually needed.

   What Are the Side Effects of Lowering the Value?
       The kernel uses a little less memory.  If the value is set to no group-
       private Q3's are allowed.

   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
       getmemwindow(1M), setmemwindow(1M), services.window(4).

			   Tunable Kernel Parameters	     max_mem_window(5)
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