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Running an app on big and LITTLE cores simultaneously?

Hello everyone,

I am running an application on Renesas R-Car H3 board. It has Cortex A57 and A53 CPUs. I am getting limited performance from running application on all 4 cores of the A57.

I wanted to ask whether it is possible to use the LITTLE A53 cores to assist the application running on A57. This would give me 8 effective cores.

 Will the switching overhead between two different CPUs cause it to run slower than it would, if I stick with just A57. Also the difference in cache memory and clock rate create unstable performance? (The application is kind of image processing related, so would need stable Frame rate on the display). 

 Has anyone tried running a single application on big and LITTLE clusters at the same time? Have it given you any performance boost utilizing 4 extra low performance cores?

Thanks.