From 15552175f8de1f03817c66a82bc93cb4e18dc809 Mon Sep 17 00:00:00 2001
From: Andres Erbsen <andreser@mit.edu>
Date: Wed, 5 Jul 2017 13:26:29 -0400
Subject: etc: add scripts to control turbo boost and hyper threading

---
 etc/hyperthreading.sh | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100755 etc/hyperthreading.sh

(limited to 'etc/hyperthreading.sh')

diff --git a/etc/hyperthreading.sh b/etc/hyperthreading.sh
new file mode 100755
index 000000000..82603c5a3
--- /dev/null
+++ b/etc/hyperthreading.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+set -eu
+
+case $1 in
+   on)
+     for f in "/sys/devices/system/cpu/cpu"[0-9]*/online; do
+       echo 1 > "$f"
+     done
+     ;;
+  off)
+    cores=""
+    for cpu in "/sys/devices/system/cpu/cpu"[0-9]* ; do
+      if grep -vq '^1$' "$cpu/online" 2>/dev/null; then
+        continue
+      fi
+      coreid=$(cat "$cpu/topology/core_id")
+      if echo "$cores" | grep -- "$coreid" ; then
+        echo 0 > "$cpu/online"
+      fi
+      cores=$(printf "$cores\n$coreid")
+    done
+    ;;
+  *) echo "USAGE: hyperthreading.sh <on|off>"
+esac
-- 
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