The linux kernel that android runs on top of controls the cpu I do not think the apps have to be CPU CORE aware.. This is due to the memory and power management of Android and arm processors.. Yes i know its much deeper then this but basically the system handles this NOT THE APPS THEMSELVES.. If Apps has to be aware of the cpu/ cores to use them there would be so mach broken apps across devices.
If im wrong please explain.
Its my Nexus 7 Get your own.Play nice and follow the rules or you WILL end up in the knob jail Cell