Benchmark Go code on a single core of an Intel CPU

bonch.sh

#!/bin/bash
# Fiddle with frequency scaling settings to reduce variance when running Go benchmarks.
# Also pins the benchmark to a single CPU.

CPU=${CPU:-1}

original_governor=$(cat /sys/devices/system/cpu/cpu$CPU/cpufreq/scaling_governor)
original_turbo=$(cat /sys/devices/system/cpu/intel_pstate/no_turbo)

disable_turbo() {
    echo 1 | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo > /dev/null
}

restore_turbo() {
    echo $original_turbo | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo > /dev/null
}

set_performance_governor() {
    echo performance | sudo tee /sys/devices/system/cpu/cpu$CPU/cpufreq/scaling_governor > /dev/null
}

restore_governor() {
    echo $original_governor | sudo tee /sys/devices/system/cpu/cpu$CPU/cpufreq/scaling_governor > /dev/null
}

execute_on_cpu() {
    taskset -c $CPU $@
    return $?
}

cleanup() {
    restore_turbo
    restore_governor
}

trap cleanup EXIT
echo "core: $CPU"
disable_turbo
set_performance_governor
execute_on_cpu $@
exit_status=$?
exit $exit_status