In play store there is an app called CPU stats. Below is the link
Using this application you can check how many cores are active at a given time and what % of CPU is being used.
There are many applications which are similar to this but I found this one quiet useful.
Hope it serves your purpose.
Exynos 5 Hexa is designed to bring optimal performance and power efficiency which are increasingly required in the mid to high-end mobile market. Hexa, as its name suggests, is powered by six CPU cores; two 1.7GHz Cortex® -A15™ cores and four 1.3GHz Cortex® -A7™ cores. Exynos 5 Hexa is one of the first Exynos Processors to embrace the power of Heterogeneous Multi-Processing (HMP). The HMP technology simply allows the Hexa to seamlessly select the right processor type and the right number of cores for any given task resulting in optimum performance while prolonging battery life. With HMP enabled, Exynos 5 Hexa can run various combinations of cores ranging from just one to all six providing up to 42% improved performance from Exynos 5 Dual but with better power efficiency.
Basically this means any number of cores can run at any combination. I wanna know if the Exynos 5 Hexa actually uses the ability, will check the app, thx.
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