cpu frequency scaling

[Capoeira]

There are different ways to do this. The easiest I guess would be to add the cpupower to your sudoers file (if your system has one) and allow a user to run it without having to issue a password:

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yourusername ALL=(ALL) NOPASSWD: /path/to/cpupower

Editing the sudoers file is done with the visudo command. Not sure if the sudoers syntax is correct though. There are other ways like using PolicyKit or changing the permissions on cpupower itself (which I wouldn't recommend).

thanks a lot,

I'll try that out later

[Capoeira]

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yourusername ALL=(ALL) NOPASSWD: /path/to/cpupower

Editing the sudoers file is done with the visudo command.

thanks, that worked

sidenote to anybody wanting to do this: comand in the scripting options of qjackctl needs "sudo"

[oddy.o.lynx]

after using real time config quick scan I was led here for clues on how to set cpu governor to performance permanently

for Debian 11 I was able to set it following these instructions

install cpufrequtils

in the file /etc/default/cpufrequtils

add the following or change to

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GOVERNOR="performance"

then install sysfsutils

in the case of having 4 CPUs, add the following to /etc/sysfs.conf

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devices/system/cpu/cpu0/cpufreq/scaling_governor = performance
devices/system/cpu/cpu1/cpufreq/scaling_governor = performance
devices/system/cpu/cpu2/cpufreq/scaling_governor = performance
devices/system/cpu/cpu3/cpufreq/scaling_governor = performance

reboot

[tseaver]

@oddy.o.lynx wrote:

then install sysfsutils

in the case of having 4 CPUs, add the following to /etc/sysfs.conf
...

I don't understand the rationale for using sysfsutils here: my Debian-based systems (Ubuntu Studio, AVL-MX) don't have it, and yet the GOVERNOR=performance bit in /etc/default/cpufrequtils works just fine after a reboot.

[Impostor]

To change freq scaling on-the-fly this script works for me (you should at least adapt the number of cpu's, mine's 12):

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#!/bin/bash

File=/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

if ! grep -q performance "$File"; then
    for ((x=0 ; x<12 ; x++)); do
        File=/sys/devices/system/cpu/cpu$x/cpufreq/scaling_governor
        echo -n performance | sudo tee $File 1>/dev/null
    done
    echo "CPUs set to performance mode"
    read
    exit 0
else
     for ((x=0 ; x<12 ; x++)); do
        File=/sys/devices/system/cpu/cpu$x/cpufreq/scaling_governor
        echo -n ondemand | sudo tee $File 1>/dev/null
    done
    echo "CPUs set to ondemand mode"
    read
    exit 0
fi