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mpss.so.1(1)

NAME
   mpss.so.1 - shared object for setting preferred page size

SYNOPSIS
   mpss.so.1

DESCRIPTION
   The mpss.so.1 shared object provides a means by which the
   preferred stack and/or heap page size can be selectively
   configured for launched processes and their descendants. To
   enable mpss.so.1, the following string needs to be present
   in the environment (see ld.so.1(1)) along with one or more
   MPSS (Multiple Page Size Support) environment variables:



   LD_PRELOAD=$LD_PRELOAD:mpss.so.1

ENVIRONMENT VARIABLES
   Once preloaded, the mpss.so.1 shared object reads the fol-
   lowing environment variables to determine any preferred page
   size requirements and any processes these may be specific
   to.

   MPSSHEAP=size

   MPSSSTACK=size
      MPSSHEAP and MPSSSTACK specify the preferred page
      sizes for the heap and stack, respectively. The speci-
      fied page size(s) are applied  to  all  created
      processes.

      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 can be qualified with K, M, G, or T to specify
      Kilobytes, Megabytes, Gigabytes, or Terabytes respec-
      tively.

   MPSSCFGFILE=config-file
      config-file is a text file which contains one or more
      mpss configuration entries of the form:


      exec-name:heap-size:stack-size

      exec-name specifies the name of an application or exe-
      cutable. The corresponding preferred page size(s) are
      set for newly created processes (see getexecname(3C))
      that match the first exec-name found in the file.

      exec-name can be a full pathname, a base name or a
      pattern string. See File Name Generation in sh(1) for
      a discussion of pattern matching.

      If heap-size and/or stack-size are not specified, the
      corresponding preferred page size(s) will not be set.

      MPSSCFGFILE takes precedence  over  MPSSHEAP  and
      MPSSSTACK.



   MPSSERRFILE=pathname
      By default, error messages are logged via syslog(3C)
      using  level  LOG_ERR  and facility LOG_USER. If
      MPSSERRFILE contains a valid pathname  (such  as
      /dev/stderr), error messages will be logged there
      instead.

EXAMPLES
   Example 1:  Configuring  preferred  page  sizes  using
   MPSSCFGFILE

   The following Bourne shell commands (see sh(1)) configure
   the preferred page sizes to a select set of applications
   with exec names that begin with foo, using the MPSSCFGFILE
   environment variable. The MPSS configuration file, mpsscfg,
   is assumed to have been previously created via a text editor
   like vi(1). The cat(1) command is only dumping out the con-
   tents.

   example$ LD_PRELOAD=$LD_PRELOAD:mpss.so.1
   example$ MPSSCFGFILE=mpsscfg
   example$ export LD_PRELOAD MPSSCFGFILE
   example$ cat $MPSSCFGFILE
   foo*:512K:64K

   Once the application has been started, pmap (see proc(1))
   can be used to view the actual page sizes configured:

   example$ foobar &
   example$ pmap -s 'pgrep foobar'

   If the desired page size is not configured (shown in the
   pmap output), it may be due to errors in the MPSS configura-
   tion file or environment variables. Check the error log (by
   default: /var/adm/messages) for errors.

   If no errors can be found, resource or alignment constraints
   may be responsible. See the NOTES section.



   Example 2: Configuring preferred page sizes using MPSSHEAP
   and MPSSSTACK

   The following Bourne shell commands configure 512K heap and
   64K stack preferred page sizes for all applications using
   the MPSSHEAP and MPSSSTACK environment variables.

   example$ LD_PRELOAD=$LD_PRELOAD:mpss.so.1
   example$ MPSSHEAP=512K
   example$ MPSSSTACK=64K
   example$ export LD_PRELOAD MPSSHEAP MPSSSTACK

   Example 3: Precedence rules (continuation from Example 2)

   The preferred page size configuration in MPSSCFGFILE over-
   rides MPSSHEAP and MPSSTACK. Appending the following com-
   mands to those in Example 2 would mean that all applications
   will be configured with 512K heap and 64K stack preferred
   page sizes with the exception of those applications, the ls
   command, and all applications beginning with ora, in the
   configuration file.

   example$ MPSSCFGFILE=mpsscfg2
   example$ export MPSSCFGFILE
   example$ cat $MPSSCFGFILE
   ls::
   ora*:4m:4m

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 attri-
   butes:

   ____________________________________________________________
  |    ATTRIBUTE TYPE    |    ATTRIBUTE VALUE    |
  |_____________________________|_____________________________|
  | Availability        | SUNWesu (32-bit)      |
  |_____________________________|_____________________________|
  |               | SUNWesxu (64-bit)      |
  |_____________________________|_____________________________|
  | Interface Stability     | Evolving          |
  |_____________________________|_____________________________|



SEE ALSO
   cat(1), ld(1), ld.so.1(1), pagesize(1), ppgsz(1), proc(1),
   sh(1), vi(1), exec(2), fork(2), memcntl(2), getexecname(3C),
   getpagesize(3C), syslog(3C), proc(4), attributes(5)

NOTES
   The heap and stack preferred page sizes are inherited. A
   child process has the same preferred page sizes as its
   parent. On exec(2), the preferred page sizes are set back to
   the default system page size unless a preferred page size
   has been configured via the mpss shared object.

   ppgsz(1), a proc tool, can also be used to set the preferred
   stack and/or heap page sizes. It cannot selectively config-
   ure the page size for descendents based on name matches.

   See also NOTES under ppgsz(1).
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