Use the sar command to check the balance of CPU usage for multiple CPU's.
# sar -u -P ALL 5 2 AIX aix4prt 0 5 000544144C00 02/09/01 15:29:32 cpu %usr %sys %wio %idle 15:29:37 0 34 46 0 20 1 32 47 0 21 - 33 47 0 20 15:29:42 0 31 48 0 21 1 35 42 0 22 - 33 45 0 22 Average 0 32 47 0 20 1 34 45 0 22 - 33 46 0 21