for cpu in 1 2 ; do
   ( while true; do true; done ) &
done

如果你想同时模拟IO充电,试试这个：

for cpu in 1 2 ; do
   ( while true; do find / -type f -exec cp {} /dev/null \; ; done ) &
done

for for cpu in 1 2 for 2 core,for cpu in 1 2 3 4 for 4 cores;)