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#!/bin/sh
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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