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 referred to as:
- MPERF increasing with maximum (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 pro-
cessor core remained in C0 (working state) or any CX (sleep state) pro-
cessor 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)
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