Script to make system more predictable during benchmarking

prepare-bench.sh

#!/bin/bash
#
# Notes to self:
# * https://github.com/andrewrk/poop as an alternative to hyperfine
# * https://easyperf.net/blog/2019/08/02/Perf-measurement-environment-on-Linux


if [[ -z "$1" ]]; then
    echo "Usage: $0 {bench|normal}"
    exit 1
fi

case $1 in
    bench)
        type powerprofilesctl >/dev/null && powerprofilesctl set performance
        if [[ -f /sys/devices/system/cpu/intel_pstate/no_turbo ]]; then
            echo 1 | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo
        fi
        if [[ -f /sys/devices/system/cpu/cpufreq/boost ]]; then
            echo 0 | sudo tee /sys/devices/system/cpu/cpufreq/boost
        fi
        for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do
            echo performance | sudo tee $i
        done
        ;;
    normal)
        for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do
            echo powersave | sudo tee $i
        done
        if [[ -f /sys/devices/system/cpu/intel_pstate/no_turbo ]]; then
            echo 0 | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo
        fi
        if [[ -f /sys/devices/system/cpu/cpufreq/boost ]]; then
            echo 1 | sudo tee /sys/devices/system/cpu/cpufreq/boost
        fi
        type powerprofilesctl >/dev/null && powerprofilesctl set balanced
        ;;
    *)
        echo "Invalid option. Use 'bench' or 'normal'."
        exit 1
        ;;
esac