Monitor your Tegra 3 Processor using Tegrastats

it needs root and works only on tegra 3 devices.
Tregrastats free is a small overlay, which shows the load of your tegra 3 processors.
it shows the load of your 4 processors and the ram usage.
it shows if the companion core or the generic core is active.
it could set the number of used cores.

Download link
Tegrastats