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cpufreq-aperf - Online in the Cloud

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This is the command cpufreq-aperf that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

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>

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