hpux man page for nsysmap64

nsysmap(5)							File Formats Manual							nsysmap(5)

NAME
       nsysmap, nsysmap64 - number of entries in a kernel dynamic memory allocation map

VALUES
   Default
       8400

   Allowed Values
DESCRIPTION
	      Note:  In  HP-UX	11i Version 3, these tunables are no longer present.  The system will establish an initial size for the table, and
	      increase the size as needed.  This manual page will be remove in a future release.

   Pre-Release 11i Version 3 Usage
       This value sizes the kernel dynamic memory resource map, an array of address/length pairs that describe the free virtual space in the  ker-
       nel's dynamic address space.

       This  array  has historically been statically-sized.  That means certain pathological workloads that fragment the kernel address space will
       result in too many entries for the array.  Rather than panicking when this condition occurs, the system throws away the last  entry,  which
       results	in  "leaked" kernel virtual address space.  If this overflow happens often enough, the system eventually runs out of virtual space
       and will panic with the following message:

       By making the map size tunable, the system can automatically scale the map size according to the system workload size and avoid this  prob-
       lem.   If  the  automatic scaling does not work, you can hand-tune to fit a particular workload.  When the default value is overridden, the
       kernel may increase the value beyond the your specification depending on the system size.

       There are different tunables for 32- and 64-bit kernel because the 64-bit kernel has more virtual  address  space.   The  tunable  controls
       32-bit kernels and the tunable controls 64-bit kernels.

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
       and were developed by HP.

OBSOLETED
						     Tunable Kernel Parameters							nsysmap(5)