swapmon(1) BSD General Commands Manual swapmon(1)NAMEswapmon — monitor swapusage, add swapspace as needed
SYNOPSISswapmon [start|stop|-F] add/remove swapspace automatically as needed
DESCRIPTIONswapmon will check the current swapusage and if more than SWAP_HIGH per‐
cent of swapspace is in use it will create a new swapfile with a size of
size of SWAP_STEP percent of the current swapspace and activate it. If
less than SWAP_LOW percent of swapspace is in use it will deactivate a
previously added swapspace file and remove it.
If called with start it will fork into the background and run as a dae‐
mon. It will check and then sleep for DELAY seconds before checking
again. Messages about the operation will be piped to LOGGER. The pid of
the daemon will be written to PIDFILE.
If called with stop it stop a previously forked swapmon daemon.
If called with -F it will run as a daemon but not detach from the termi‐
nal. Messages will still be piped to LOGGGER and not to the terminal by
default. You may specify "/bin/cat" as LOGGER to get the messages on the
terminal.
Default values:
SWAP_HIGH
75
SWAP_LOW
45
SWAP_STEP
100-SWAP_HIGH (=25)
SM_HOME "/usr/.swap/"
DELAY 30
LOGGER /usr/bin/logger
PIDFILE /var/run/swapmon.pid
swapmon can be called via cron(5). In that case you would receive mes‐
sages about the swapspace being adjusted via e-mail. To use it that way
add a crontab entry to the root crontab similar to this:
* * * * * /usr/local/sbin/swapmon
FILES
/usr/local/etc/swapmonrc optional configuration file for overwriting the
defaults above
$SM_HOME The "homedirectory" of swapmon. In here the
swapfiles as well as a lockfile and the swap‐
file list will be created.
SEE ALSOswapctl(8), mdconfig(8), truncate(8), logger(1), crontab(5)FreeBSD April 29, 2024 FreeBSD
