cpu-freq-gov-tools

Utilities for tuning cpu freq governor.

chgov.sh

A script for changing governor of each cpu.

Dependency

• cpufreq-set install with apt install cpufrequtils

Usage

sudo ./chgov.sh [-h] [-c number of your cpu's cores] governor-name

• -c Default value is 8.

rec-freq.sh

A script for recording cpu frequency. You shold use rec-freq.c insted of this.

Usage

./rec-freq.sh [-h] [-i interval sec] [-t end sec] [-o output file] [-c number of your cpu's cores] commands

• -i Default value is 0.1. Actually, time to sleep is used (value of -i) - 0.01.
• -t Default value is 300.
• -o Default value is out.csv.
• -c Default value is 8.
• commands Executed when the script starts.

Output

CPU frequency is recorded in csv format.

example:

time, cpu0 (ondemand), cpu1 (ondemand), cpu2(ondemand), cpu3(ondemand)
123456.789, 14000, 14000, 14000, 14000

the value in parentheses is the governor used for the cpu. time is in format %H%M%S.%3N.

rec-freq.c

A program for recording cpu frequency.

Usage

./rec-freq.o [-h] [-i interval micro sec] [-t end mili sec] [-o output file] [-c number of your cpu's cores]

• -i Default value is 8000. The actual interval is a little longer than this.
• -t Default value is 300000.
• -o Default value is out.csv.
• -c Default value is 8.

Output

CPU frequency is recorded in csv format.

example:

time, cpu0 (ondemand), cpu1 (ondemand), cpu2(ondemand), cpu3(ondemand)
XXX.XXXXXXXXX, 14000, 14000, 14000, 14000

the value in parentheses is the governor used for the cpu. time is in format (ld.%9ld, ts.tv_sec, ts.tv_nsec).

plot_freq.py

A program to make a graph of CPU freqency from csv whose format is same as output of rec-freq.c. This programm has a cheap function to calculate the arithmetic mean of the frequencies.

Dependency

• Python2
• matplotlib

Usage

python plot_freq [input_file_path] [option: time] [option: line]

• [input_file_path] Path to input csv file
• [option: time] If this parameter is given, this program print the simple arithmetic mean of the frequencies until the given time.
• [option: line] This is the third arg so time is needed when you give this parameter. When you give the parameter, parameter time is ignored. If this parameter is given, this program print the simple arithmetic mean of the frequencies until the given line.