I run the example "Stencil Operations on a GPU" in matlab command. I got following output. I don't have any advantage in using of Arrayfun on GPU compared with simple GPU array. my GPU device is GeForce GTX 980 Ti. is it reasonable?

paralleldemo_gpu_stencil
Average time on the CPU: 1.906ms per generation.
Average time on the GPU: 0.792ms per generation (2.4x faster).
Average time using GPU arrayfun: 0.996ms per generation (1.9x faster).
CPU:          1.906ms per generation.
Simple GPU:   0.792ms per generation (2.4x faster).
Arrayfun GPU: 0.996ms per generation (1.9x faster).

Answer 1

[Joss Knight]

Yes, it's perfectly reasonable.

[masoumeh mousavi]

thank you, is it the reason due to the kind of GPU? I expected more computational speed using arrayfun on GPU as claimed!(it means the usage of arrayfun strictly depends on the kind of GPU!?)

[Joss Knight]

The speed of everything you do on the GPU depends on the kind of GPU. You should always experiment with different approaches and use whichever works best for you - we don't claim that arrayfun will always be the best approach. It looks like for your device MATLAB is doing a great job of making the simplest approach the fastest, which is ideal.