dynamic_pager(8) [opendarwin man page]

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

NAME

     dynamic_pager -- dynamic pager external storage manager

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, and 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.

     -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.

     -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 external 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.

FILES

     /private/var/vm/swapfile*	Default external paging files.

SEE ALSO

     macx_swapon(2), macx_swapoff(2).

Mac OS X							   July 8, 2003 							  Mac OS X

SWAPON(8)						     Linux Programmer's Manual							 SWAPON(8)

NAME

       swapon, swapoff - enable/disable devices and files for paging and swapping

SYNOPSIS

       /sbin/swapon [-h -V]
       /sbin/swapon -a [-v] [-e]
       /sbin/swapon [-v] [-p priority]	specialfile ...
       /sbin/swapon [-s]
       /sbin/swapoff [-h -V]
       /sbin/swapoff -a
       /sbin/swapoff specialfile ...

DESCRIPTION

       Swapon  is used to specify devices on which paging and swapping are to take place.  Calls to swapon normally occur in the system multi-user
       initialization file /etc/rc making all swap devices available, so that the paging and  swapping	activity  is  interleaved  across  several
       devices and files.

       Normally, the first form is used:

       -h     Provide help

       -V     Display version

       -s     Display swap usage summary by device. Equivalent to "cat /proc/swaps".  Not available before Linux 2.1.25.

       -a     All  devices marked as ``swap'' swap devices in /etc/fstab are made available. Devices that are already running as swap are silently
	      skipped.

       -e     When -a is used with swapon, -e makes swapon silently skip devices that do not exist.

       -p priority
	      Specify priority for swapon.  This option is only available if swapon was compiled under and is used under a 1.3.2 or later  kernel.
	      priority	is a value between 0 and 32767. See swapon(2) for a full description of swap priorities. Add pri=value to the option field
	      of /etc/fstab for use with swapon -a.

       Swapoff disables swapping on the specified devices and files.  When the -a flag is given, swapping is disabled on all  known  swap  devices
       and files (as found in /proc/swaps or /etc/fstab).

NOTE

       You should not use swapon on a file with holes.	Swap over NFS may not work.

SEE ALSO

       swapon(2), swapoff(2), fstab(5), init(8), mkswap(8), rc(8), mount(8)

FILES

       /dev/hd??  standard paging devices
       /dev/sd??  standard (SCSI) paging devices
       /etc/fstab ascii filesystem description table

HISTORY

       The swapon command appeared in 4.0BSD.

Linux 1.x							 25 September 1995							 SWAPON(8)