Reviewers: jarin,
Description:
Check in "cpu.sh" script to control CPU governor/cores on Linux
This can help with reproducing stability bugs or performance issues.
Please review this at https://codereview.chromium.org/485763003/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files (+62, -0 lines):
A tools/cpu.sh
Index: tools/cpu.sh
diff --git a/tools/cpu.sh b/tools/cpu.sh
new file mode 100755
index
0000000000000000000000000000000000000000..8e8a243c6058803c8356ad4c75dce601bd0cd737
--- /dev/null
+++ b/tools/cpu.sh
@@ -0,0 +1,62 @@
+#!/bin/bash
+# Copyright 2014 the V8 project authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+CPUPATH=/sys/devices/system/cpu
+
+MAXID=$(cat $CPUPATH/present | awk -F- '{print $NF}')
+
+set_governor() {
+ echo "Setting CPU frequency governor to \"$1\""
+ for (( i=0; i<=$MAXID; i++ )); do
+ echo "$1" > $CPUPATH/cpu$i/cpufreq/scaling_governor
+ done
+}
+
+dual_core() {
+ echo "Switching to dual-core mode"
+ for (( i=2; i<=$MAXID; i++ )); do
+ echo 0 > $CPUPATH/cpu$i/online
+ done
+}
+
+single_core() {
+ echo "Switching to single-core mode"
+ for (( i=1; i<=$MAXID; i++ )); do
+ echo 0 > $CPUPATH/cpu$i/online
+ done
+}
+
+
+all_cores() {
+ echo "Reactivating all CPU cores"
+ for (( i=2; i<=$MAXID; i++ )); do
+ echo 1 > $CPUPATH/cpu$i/online
+ done
+}
+
+case "$1" in
+ fast | performance)
+ set_governor "performance"
+ ;;
+ slow | powersave)
+ set_governor "powersave"
+ ;;
+ default | ondemand)
+ set_governor "ondemand"
+ ;;
+ dualcore | dual)
+ dual_core
+ ;;
+ singlecore | single)
+ single_core
+ ;;
+ allcores | all)
+ all_cores
+ ;;
+ *)
+ echo "Usage: $0 fast|slow|default|singlecore|dualcore|all"
+ exit 1
+ ;;
+esac
--
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