67 lines
1.8 KiB
Bash
Executable File
67 lines
1.8 KiB
Bash
Executable File
#!/usr/bin/env bash
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# This scripts queries and modifies CPU scaling frequencies to produce more
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# accurate benchmark results. To move from a low energy state C-state to a
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# higher one, run 'governor.sh performance'. To move back to a low power state
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# run 'governor.sh powersave' or reboot. The script is based on code by
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# Andy Polyakov, http://www.openssl.org/~appro/cryptogams/.
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# Fixup ancient Bash
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# https://unix.stackexchange.com/q/468579/56041
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if [[ -z "$BASH_SOURCE" ]]; then
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BASH_SOURCE="$0"
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fi
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if [[ "$EUID" -ne 0 ]]; then
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echo "This script must be run as root"
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[[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
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fi
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if [ "x$1" = "x" ]; then
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echo "usage: $0 on[demand]|pe[rformance]|po[wersave]|us[erspace]?"
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[[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
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fi
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# "on demand" may result in a "invalid write argument" or similar
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case $1 in
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on*|de*) governor="ondemand";;
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po*|pw*) governor="powersave";;
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pe*) governor="performance";;
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us*) governor="userspace";;
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\?) ;;
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*) echo "$1: unrecognized governor";;
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esac
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if [ -z "$governor" ]; then
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[[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
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fi
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cpus=$(ls /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor 2>/dev/null)
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if [ -z "$cpus" ]; then
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echo "Failed to read CPU system device tree"
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[[ "$0" = "$BASH_SOURCE" ]] && exit 1 || return 1
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fi
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echo "Current CPU governor scaling settings:"
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count=0
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for cpu in $cpus; do
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echo " CPU $count:" $(cat "$cpu")
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((count++))
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done
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if [ "x$governor" != "x" ]; then
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for cpu in $cpus; do
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echo $governor > $cpu
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done
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fi
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echo "New CPU governor scaling settings:"
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count=0
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for cpu in $cpus; do
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echo " CPU $count:" $(cat "$cpu")
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((count++))
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done
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[[ "$0" = "$BASH_SOURCE" ]] && exit 0 || return 0
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