dynamic_pager(8) BSD System Manager's Manual dynamic_pager(8)NAMEdynamic_pager — external storage manager for dynamic pager
SYNOPSISdynamic_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
