#!/bin/bash

do_hotplug()
{
	for i in $(seq 1 $2)
	do
		echo $1 > /sys/devices/system/cpu/cpu$i/online
	done
}

LAST_CPU=$(($(nproc)-1))

while true
do
	do_hotplug 0 $LAST_CPU
	do_hotplug 1 $LAST_CPU
done