LW-CTL(1) General Commands Manual LW-CTL(1)NAME
lw-ctl - send commands to a running loadwatch
SYNOPSIS
lw-ctl file command
DESCRIPTION
lw-ctl sends commands to a running loadwatch. You can instruct loadwatch to enter one of three states, RUN, STOP, or WATCH.
The parameters are:
file The UNIX domain socket that loadwatch is listening to.
command
One of:
RUN Allow the child process to run regardless of system load.
STOP Suspend the child process regardless of system load.
WATCH Return to normal mode, where the system load determines if the program is allowed to run.
SEE ALSO loadwatch(1)AUTHOR
This manual page was written by Nicolas Boullis <nboullis@debian.org>, for the Debian GNU/Linux system (but may be used by others).
May 2002 LW-CTL(1)
Check Out this Related Man Page
LOADWATCH(1) General Commands Manual LOADWATCH(1)NAME
loadwatch - run a program when machine is idle
SYNOPSIS
loadwatch [options] -p pid | [--] prog [args]
DESCRIPTION
loadwatch either spawns a child process prog with the arguments args and controls it with all its process group, or takes control of an
already running process with pid pid with all its process group.
loadwatch allows the controlled processes to run while the load average remains below high_limit. Every delay seconds, loadwatch checks the
load average. If the load is above high_limit, the child is suspended; the child is resumed when the load falls below low_limit.
OPTIONS
A summary of options is included below.
-h high_limit
A decimal value that sets the system load at which the child process will be suspended. (Default: 1.25)
-l low_limit
A decimal value that sets the system load at which the child process will be resumed. (Default: 0.25)
-d delay
An integral number of seconds that sets how often the system load will be checked. (Default: 10)
-n copies
An integer value that sets the number of copies of prog to run. (Default: 1)
-u file
Create a UNIX domain socket file for use by lw-ctl.
-p pid The pid of the program that should be controlled by loadwatch (with all its process group).
SEE ALSO lw-ctl(1), nice(1)BUGS
You should choose low_limit and high_limit carefully. When the load drops below low_limit, the process(es) will be resumed, and it should
not, by itself, cause the load to raise above high_limit, or the whole will oscillate, periodically suspending and resuming the
process(es).
Similarly, if several instances of loadwatch are running, they may resume their processes at the same time, leading to oscillations if the
limits are not carefully chosen. Hence, each instance of loadwatch affects every other instance on the computer, and should not be consid-
ered in isolation.
AUTHOR
This manual page was written by Dale E. Martin <dmartin@debian.org>, for the Debian GNU/Linux system (but may be used by others). It was
then updated by Nicolas Boullis <nboullis@debian.org>.
July 2003 LOADWATCH(1)
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