查看是否有开启超线程

lscpu | grep Thread

Thread(s) per core: 2

如果输出了这个，就表示有开启超线程啦~

开关超线程脚本

#!/bin/bash
HYPERTHREADING=1
function toggleHyperThreading() {
	for CPU in /sys/devices/system/cpu/cpu[0-9]*; do
		CPUID=`basename $CPU | cut -b4-`
		echo -en "CPU: $CPUIDt"
		[ -e $CPU/online ] && echo "1" > $CPU/online
		THREAD1=`cat $CPU/topology/thread_siblings_list | cut -f1 -d,`
		if [ $CPUID = $THREAD1 ]; then
			echo "-> enable"
			[ -e $CPU/online ] && echo "1" > $CPU/online
		else
		if [ "$HYPERTHREADING" -eq "0" ]; then echo "-> disabled"; else echo "-> enabled"; fi
			echo "$HYPERTHREADING" > $CPU/online
		fi
	done
}

function enabled() {
	echo -en "Enabling HyperThreadingn"
	HYPERTHREADING=1
	toggleHyperThreading
}

function disabled() {
	echo -en "Disabling HyperThreadingn"
	HYPERTHREADING=0
	toggleHyperThreading
}

#
ONLINE=$(cat /sys/devices/system/cpu/online)
OFFLINE=$(cat /sys/devices/system/cpu/offline)
echo "---------------------------------------------------"
echo -en "CPU's online: $ONLINEt CPU's offline: $OFFLINEn"
echo "---------------------------------------------------"
while true; do
	read -p "Type in e to enable or d disable hyperThreading or q to quit [e/d/q] ?" ed
	case $ed in
		[Ee]* ) enabled; break;;
		[Dd]* ) disabled;exit;;
		[Qq]* ) exit;;
		* ) echo "Please answer e for enable or d for disable hyperThreading.";;
	esac
done

补充

对于CPU密集型的数值程序，超线程技术可能会导致程序整体性能下降

鉴于此，执行OpenMP或者MPI数值程序时建议关闭超线程技术。

最后

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