This is very interesting. Can you elaborate on this a bit more? I'm assuming this is Linux? How could this be achieved? Are there done special scripts or programs?
Just write the desired governor to /sys/devices/system/cpu/cpu${X}/cpufreq/scaling_governor, e.g. powersave, performance etc. Poke about in there to see what governors are available, and do it in a loop to set all cores (you can get the number from /proc/cpuinfo).