cpufreq-aperf
Calculates the average frequency over a time period
TLDR
Start calculating, defaulting to all CPU cores and 1 second refresh interval
Start calculating for CPU 1 only
Start calculating with a 3 second refresh interval for all CPU cores
Calculate only once
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)
