Check how much memory or CPU is being used per app, for all running apps

I'm trying to analyze how much memory, battery and cpu usage is taken by each app that is currently running on my iOS device. I don't mind if this can be done programmatically or otherwise. I have XCode up and running and I realize it can be used to check the CPU/memory of apps I install and run on my device.

Just to be clear, I do not want the total CPU/memory usage, but rather per app for all apps that are currently running.

Is this possible in iOS 8.1, in any way, without jailbreaking my device?