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ppgsz(1)

NAME
   ppgsz - set preferred stack and/or heap page size

SYNOPSIS
   /usr/bin/ppgsz [-F] -o option[,option] cmd | -p pid...

DESCRIPTION
   The ppgsz utility sets the preferred stack and/or heap page
   size for the target process(es), that is, the launched cmd
   or the process(es) in the pid list. ppgsz stops the target
   process(es) while changing the page size. See memcntl(2).
OPTIONS
   The following options are supported:

   -F  Force. Sets the preferred page size options(s) for
      target  process(es)  even if controlled by other
      process(es). Caution should be exercised when using
      the -F flag. See proc(1).

   -p pid
      Sets the preferred page size option(s) for the target
      process(es) in the process-id (pid) list following the
      -p option. The pid list can also consist of names in
      the /proc directory. Only the process owner or the
      super-user is permitted to set page size.

      cmd is interpreted if -p is not specified. ppgsz
      launches cmd and applies page size option(s) to the
      new process.

      The heap and stack preferred page sizes are inherited.
      Child process(es) created (see fork(2)) from the
      launched process or the target process(es) in the pid
      list after ppgsz completes will inherit the preferred
      heap and stack page sizes. The preferred page sizes
      are set back to the default system page size on
      exec(2) (see getpagesize(3C)).

   -o option[,option]
      The options are:
      heap=size
         This option specifies the preferred page size
         for the heap of the target process(es). heap is
         defined to be the bss (uninitialized data) and
         the brk area that immediately follows the bss
         (see brk(2)). The preferred heap page size is
         set for the existing heap and for any additional
         heap memory allocated in the future. See NOTES.

      stack=size
         This option specifies the preferred page size
         for the stack of the target process(es). The
         preferred stack page size is set for the exist-
         ing stack and newly allocated parts of the stack
         as it expands.



   At least one of the above options must be specified.

   size must be a supported page size (see pagesize(1)) or 0,
   in which case the system will select an appropriate page
   size (see memcntl(2)).
      size defaults to bytes and can be specified in octal
      (0), decimal, or hexadecimal (0x). The numeric value
      can be qualified with K, M, G, or T to specify Kilo-
      bytes, Megabytes, Gigabytes, or Terabytes, respec-
      tively. 4194304, 0x400000, 4096K, 0x1000K, and 4M are
      different ways to specify 4 Megabytes.
EXAMPLES
   Example 1: Setting the preferred heap and stack page size

   The following example sets the preferred heap page size to
   4M and the preferred stack page size to 512K for all ora-
   owned processes running commands that begin with ora:

   example% ppgsz -o heap=4M,stack=512K -p 'pgrep -u ora '^ora''

EXIT STATUS
   If cmd is specified and successfully invoked (see exec(2)),
   the exit status of ppgsz will be the exit status of cmd.
   Otherwise, ppgsz will exit with one of the following values:

   0   Successfully set preferred page size(s) for processes
      in the pid list.

   125  An error occurred in ppgsz. Errors include: invalid
      argument,   invalid page size(s) specified, and
      failure to set preferred page size(s) for one or more
      processes in the pid list or cmd.

   126  cmd was found but could not be invoked.

   127  cmd could not be found.
FILES
   /proc/*
      Process files.

   /usr/lib/ld/map.bssalign
      A template link-editor mapfile for aligning bss (see NOTES)


ATTRIBUTES
   See attributes(5) for descriptions of the following attributes:
   ____________________________________________________________
  |    ATTRIBUTE TYPE    |    ATTRIBUTE VALUE    |
  |_____________________________|_____________________________|
  | Availability        | SUNWesu (32-bit)      |
  |_____________________________|_____________________________|
  |               | SUNWesxu (64-bit)      |
  |_____________________________|_____________________________|
  | Interface Stability     | Evolving          |
  |_____________________________|_____________________________|

SEE ALSO
   ld(1),  mpss.so.1(1),  pagesize(1),  pgrep(1),  pmap(1),
   proc(1), brk(2), exec(2), fork(2), memcntl(2), sbrk(2),
   getpagesize(3C), proc(4), attributes(5)

   Linker and Libraries Guide

NOTES
   Due to resource constraints, the setting of the preferred
   page size does not necessarily guarantee that the target
   process(es) will get the preferred page size. Use pmap(1) to
   view the actual heap and stack page sizes of the target
   process(es) (see pmap -s option).

   Large pages are required to be mapped at addresses that are
   multiples of the size of the large page. Given that the heap
   is typically not large page aligned, the starting portions
   of the heap (below the first large page aligned address) are
   mapped  with  the  system  memory  page  size.  See
   getpagesize(3C).

   To provide a heap that will be mapped with a large page
   size, an application can be built using a link-editor
   (ld(1)) mapfile containing the bss segment declaration
   directive. Refer to the section ''Mapfile Option'' in the
   Linker and Libraries Guide for more details of this direc-
   tive   and  the  template  mapfile  provided  in
   /usr/lib/ld/map.bssalign. Users are cautioned that an align-
   ment specification may be machine-specific and may lose its
   benefit on different hardware platforms. A more flexible
   means of requesting the most optimal underlying page size
   may evolve in future releases.

   mpss.so.1(1), a preloadable shared object, can also be used
   to set the preferred stack and/or heap page sizes.
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