configure cpu governor

cpu情報の確認

cat /proc/cpuinfo

cpuクロック関連ツール導入

apt-get install cpufrequtils

現在のクロックやガバナの表示

cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_min_freq
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

状態確認

cpufreq-info
cpufreq-info -p

ガバナの変更

cpufreq-set -g ondemand

os起動時のガバナの指定

cp -pi /usr/share/doc/cpufrequtils/examples/cpufrequtils.sample /etc/default/cpufrequtils
vi /etc/default/cpufrequtils

service cpufrequtils restart

Disable swap on raspbian buster

systemctl status dphys-swapfile

systemctl stop dphys-swapfile
systemctl is-active dphys-swapfile

systemctl disable dphys-swapfile
systemctl is-enabled dphys-swapfile

rm /var/swap

Use tmpfs

mount -t tmpfs tmpfs <mount point>

or

cat << END >> /etc/fstab
tmpfs           /tmp            tmpfs   defaults,size=256m,noatime,mode=1777  0       0
END
mount /tmp