cpufreq-aperf(1) [debian man page]

cpufreq-aperf(1)														  cpufreq-aperf(1)

NAME

       cpufreq-aperf - Calculates the average frequency over a time period

SYNTAX

       cpufreq-aperf [options]

DESCRIPTION

       On latest processors exist two MSR registers refered to as:
	 - MPERF increasing with maxium (P0) frequency in C0
	 - APERF increasing with current/actual frequency in C0

       From this information the average frequency over a time period can be calculated and this is what this tool does.

       A  nice	falloff  feature  beside the average frequency is the time a processor core remained in C0 (working state) or any CX (sleep state)
       processor sleep state during the measured time period. This information can be determined from the fact that MPERF  only  increases  in	C0
       state.

OPTIONS

       -c --cpu <CPU>
	       The <CPU> core to measure - default all cores.

       -i --interval <seconds>
	      Refresh rate - default 1 second.

       -o --once
	      Exit after one interval.

       -h --help
	      Prints the available options.

REMARKS

       The msr driver must be loaded for this command to work.

AUTHORS

       Thomas Renninger <trenn@suse.de>

SEE ALSO

       cpufreq-set(1), cpufreq-info(1)

Mattia Dongili								0.1							  cpufreq-aperf(1)

cpufreq-info(1) 														   cpufreq-info(1)

NAME

       cpufreq-info - Utility to retrieve cpufreq kernel information

SYNTAX

       cpufreq-info [options]

DESCRIPTION

       A small tool which prints out cpufreq information helpful to developers and interested users.

OPTIONS

       -c --cpu <CPU>
	       <CPU> number which information shall be determined about.

       -e --debug
	      Prints out debug information.

       -f --freq
	      Get frequency the CPU currently runs at, according to the cpufreq core.

       -w --hwfreq
	      Get frequency the CPU currently runs at, by reading it from hardware (only available to root).

       -l --hwlimits
	      Determine the minimum and maximum CPU frequency allowed.

       -d --driver
	      Determines the used cpufreq kernel driver.

       -p --policy
	      Gets the currently used cpufreq policy.

       -g --governors
	      Determines available cpufreq governors.

       -a --related-cpus
	      Determines which CPUs run at the same hardware frequency.

       -a --affected-cpus
	      Determines which CPUs need to have their frequency coordinated by software.

       -s --stats
	      Shows cpufreq statistics if available.

       -y --latency
	      Determines the maximum latency on CPU frequency changes.

       -o --proc
	      Prints out information like provided by the /proc/cpufreq interface in 2.4. and early 2.6. kernels.

       -m --human
	      human-readable output for the -f, -w, -s and -y parameters.

       -h --help
	      Prints out the help screen.

REMARKS

       You can't specify more than one of the output specific options -o -e -a -g -p -d -l -w -f -y.

       You also can't specify the -o option combined with the -c option.

FILES

       /sys/devices/system/cpu/cpu*/cpufreq/
       /proc/cpufreq (deprecated)
       /proc/sys/cpu/ (deprecated)

AUTHORS

       Dominik Brodowski <linux@brodo.de> - author
       Mattia Dongili<malattia@gmail.com> - first autolibtoolization

SEE ALSO

       cpufreq-set(1)

Mattia Dongili								0.1							   cpufreq-info(1)