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dynamic_pager(8)          BSD System Manager's Manual         dynamic_pager(8)


NAME

     dynamic_pager -- external storage manager for dynamic pager


SYNOPSIS

     dynamic_pager [-F filename] [-S filesize] [-H high-water-trigger]
                   [-L low-water-trigger] [-P priority]


DESCRIPTION

     The dynamic_pager daemon manages a pool of external swap files which the
     kernel uses to support demand paging.  This pool is expanded with new
     swap files as load on the system increases.  It is contracted when the
     swapping resources are no longer needed.  The dynamic_pager daemon also
     provides a notification service for those applications which wish to
     receive notices when the external paging pool expands or contracts.


OPTIONS

     -F      The base name of the filename to use for the external paging
             files.  By default this is /private/var/vm/swapfile.

     -H      If there are less than high-water-trigger bytes free in the
             external paging files, the kernel will signal dynamic_pager to
             add a new external paging file.

     -L      If there are more than low-water-trigger bytes free in the exter-
             nal paging files, the kernel will coalese in-use pages and signal
             dynamic_pager to discard an external paging file.
             Low-water-trigger must be greater than high-water-trigger +
             filesize.

     -P      This option is currently unimplemented.

     -S      The fixed filesize [in bytes] to use for the paging files.  By
             default dynamic_pager uses variable sized paging files, using
             larger sized files as paging demands increase.  The -S, -H and -L
             options disable that default and cause dynamic_pager to use a
             series of fixed sized external paging files.


FILES

     /private/var/vm/swapfile*                           Default external pag-
                                                         ing files.
     /Library/Preferences/com.apple.virtualMemory.plist  Configuration file.


XML PROPERTY LIST KEYS

     The following keys can be specified in the configuration file.  Please
     see plist(5) for more information about property list files.

     UseEncryptedSwap <boolean>
     This optional key activates encrypted swap (aka Secure VM), so that all
     data is encrypted before being written to a swap file.  The default is on
     for portable computers and off for other computers.

Mac OS X                         July 8, 2003                         Mac OS X

Mac OS X 10.8 - Generated Mon Sep 3 18:39:59 CDT 2012
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