cpupower is a Linux kernel tool which examines and tunes power saving related of your processor. It shows and set processor power related values.
This is a collection of tools.
This is free and open source software.
Commands provided:
- frequency-info – a small tool which prints out cpufreq information helpful to developers and interested users.
- frequency-set – allows you to modify cpufreq settings without having to type e.g. “/sys/devices/system/cpu/cpu0/cpufreq/scaling_set_speed” each time.
- idle-info – prints out per cpu idle information helpful to developers and interested users. CPU sleep state statistics and descriptions are retrieved from sysfs files, exported by the cpuidle kernel subsystem. The kernel only updates these statistics when it enters or leaves an idle state, therefore on a very idle or a very busy system, these statistics may not be accurate. They still provide a good overview about the usage and availability of processor sleep states on the platform.
- idle-set – set cpu idle, also called cpu sleep state, specific options offered by the kernel. One example is disabling sleep states. This can be handy for power vs performance tuning.
- powercap-info – shows kernel powercapping subsystem information. This needs hardware support and a loaded powercapping driver (at this time only intel_rapl driver exists) exporting hardware values userspace via sysfs. Some options are platform wide, some affect single cores.
- set – sets kernel configurations or directly accesses hardware registers affecting processor power saving policies.
- info – shows kernel configurations or processor hardware registers affecting processor power saving policies.
- monitor – reports processor topology, frequency and idle power state statistics. Either command is forked and statistics are printed upon its completion, or statistics are printed periodically.
Website: www.kernel.org
Support:
Developer: Linux kernel developers
License: GNU General Public License v2.0
cpupower is written in C. Learn C with our recommended free books and free tutorials.
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