powertop on centos8

Powertop is the other monitoring tool to cli in linux. 

Installation is very simple:

 dnf install powertop

How it use? 

just command powertop:

There is an output from powertop:

Summary: 183.2 wakeups/second,  0.0 GPU ops/seconds, 0.0 VFS ops/sec and 0.8% CP

                Usage       Events/s    Category       Description

              2.8 ms/s      48.2        Process        [PID 3495] powertop

            202.7 µs/s      32.8        Timer          tick_sched_timer

            309.1 µs/s      15.4        Timer          hrtimer_wakeup

            129.4 µs/s      13.5        Process        [PID 10] [rcu_sched]

            191.9 µs/s      10.6        Process        [PID 3285] /usr/sbin/http

            208.3 µs/s       5.8        Process        [PID 3331] /usr/sbin/http

            182.4 µs/s       3.9        Process        [PID 3284] /usr/sbin/http

            161.4 µs/s       3.9        Process        [PID 2242] /usr/lib64/ici

              6.1 µs/s       3.9        kWork          kfree_rcu_monitor

we can calibrate powertop: 

[root@localhost ~]# powertop --calibrate

[root@localhost ~]# powertop --calibrate

modprobe cpufreq_stats failedLoaded 0 prior measurements

RAPL device for cpu 0

RAPL device for cpu 0

Devfreq not enabled

glob returned GLOB_ABORTED

Starting PowerTOP power estimate calibration

Calibrating idle

/usr/bin/xset:  unable to open display ":0"

Calibrating: disk usage

...

and powetop will be running

- we have cli