63 lines
1.2 KiB
Bash
63 lines
1.2 KiB
Bash
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#!/bin/bash
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# Copyright 2014 the V8 project authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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CPUPATH=/sys/devices/system/cpu
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MAXID=$(cat $CPUPATH/present | awk -F- '{print $NF}')
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set_governor() {
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echo "Setting CPU frequency governor to \"$1\""
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for (( i=0; i<=$MAXID; i++ )); do
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echo "$1" > $CPUPATH/cpu$i/cpufreq/scaling_governor
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done
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}
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dual_core() {
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echo "Switching to dual-core mode"
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for (( i=2; i<=$MAXID; i++ )); do
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echo 0 > $CPUPATH/cpu$i/online
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done
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}
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single_core() {
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echo "Switching to single-core mode"
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for (( i=1; i<=$MAXID; i++ )); do
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echo 0 > $CPUPATH/cpu$i/online
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done
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}
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all_cores() {
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echo "Reactivating all CPU cores"
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for (( i=2; i<=$MAXID; i++ )); do
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echo 1 > $CPUPATH/cpu$i/online
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done
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}
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case "$1" in
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fast | performance)
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set_governor "performance"
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;;
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slow | powersave)
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set_governor "powersave"
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;;
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default | ondemand)
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set_governor "ondemand"
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;;
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dualcore | dual)
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dual_core
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;;
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singlecore | single)
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single_core
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;;
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allcores | all)
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all_cores
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;;
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*)
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echo "Usage: $0 fast|slow|default|singlecore|dualcore|all"
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exit 1
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;;
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esac
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