Simulate heavy load CPU and IO on Linux

gistfile1.sh

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

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


# use 1 2 3 4 for quad core, etc.