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CPUFREQD(8) - Linux man page online | Administration and privileged commands

Intelligently monitor and manipulate CPU frequency.

Chapter
05 May 2005
CPUFREQD(8) CPUFREQD(8)

NAME

cpufreqd - intelligently monitor and manipulate CPU frequency

SYNOPSIS

cpufreqd [-Dmhv] [-f filename] [-V verbosity]

DESCRIPTION

cpufreqd is used to monitor the status of the system and adjust the frequency of the CPU according to the user configuration. The behaviour of the daemon is fully configurable. Logs are reported through syslogd.

PARAMETERS

-D, --no-daemon stay in foreground (used to debug). -m, --manual start in manual mode. -f filename, --file=filename Specify the configuration file to read. The default is /etc/cpufreqd.conf. -h, --help Display command line help. -v, --version Display the version number of the daemon. -V, --verbosity verbosity level from 0 (less verbose) to 7 (most verbose). Default verbosity is 4

SIGNALS

SIGHUP This lets cpufreqd perform a re-initialization. The configuration file (default is /etc/cpufreqd.conf) will be re-read and probes re-done. (Not yet implemented in cpufreqd-2.0) SIGINT, SIGTERM cpufreqd will terminate.

EXAMPLES

/usr/sbin/cpufreqd -D

NOTES

Some ACPI implementations are very cpu-consuming when reading the info file of system batteries. Cpufreqd implements a simple workaround that avoids reading that file except on initialization or reinitialization. This has the effect of needing to send an HUP signal if inserting a new battery, otherwise battery measurement won't be correct.

FILES

/sys/devices/system/cpu/cpu*/cpufreq kernel cpu frequency interface /proc/cpufreq old deprecated kernel cpu frequency interface (please avoid it) /proc/acpi kernel power management interface (ACPI) /proc/apm kernel power management interface (APM) /proc/pmu kernel power management interface (PMU). (Not yet implemented in cpufreqd-2.0) /etc/cpufreqd.conf cpufreqd configuration file

SEE ALSO

cpufreqd.conf(5),syslogd(8),cpufreqd-set(1),cpufreqd-get(1)

BUGS

Multiple CPUs are not considered separately thus the same policy is set in every available CPU. Battery can only be specified in percent, not in minutes remaining.

AUTHOR

George Staikos <@0wned.org> Mattia Dongili <@linux.it> Rene Rebe <@rocklinux.org>
05 May 2005 CPUFREQD(8)
This manual Reference Other manuals
cpufreqd(8) referred by cpufreqd-get(1) | cpufreqd-set(1) | cpufreqd.conf(5)
refer to cpufreqd-get(1) | cpufreqd-set(1) | cpufreqd.conf(5) | syslogd(8)
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