NAME

swapmon — monitor swapusage, add swapspace as needed

SYNOPSIS

DESCRIPTION

swapmon will check the current swapusage and if more than SWAP_HIGH percent 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 daemon. 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 terminal. 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 messages 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 swapfile list will be created.

SEE ALSO

swapctl(8), mdconfig(8), truncate(8), logger(1), crontab(5)