It's all about a great utility written by Alexei which will come handy for all those in need of comparing the performance of the Stockfish engine across their devices and also against their PCs.
The usage is simple: Just GET THIS APK first, transfer it into your device and run it. A DOS-like command line interface will appear for you to enter a command using: bench [hash] [threads] [depth]. Simple, isn't it?
My trials on the "oldie but goldie" quadcore Exynos 4412 showed accurately 915K as expected, using the command like BENCH 128 4 13. Now it's time to repeat for yourself.
The app is using the Stockfish build dated 03-May-2017, so if you want to compare it to a PC engine make sure it's a build from the same date.