sgemm using opengl es slow on android

[Jesse Lee]

I ported sgemm function from  weblas to c/c++(android) with opengl es 3.0, which I called esgemm.

I use the esgemm on my application . but I find the speed is very slow on android.

in my pc (Intel® Core™ i7-6700 CPU @ 3.40GHz × 8  Intel® HD Graphics 530 (Skylake GT2) )

the speed is almost same with open blas.

 pc:

openBlas

52.91ms

esgemm

67.7ms

but on  my S6 android phone.(Exynos 7420 Mali-T760)

 the speed is very slow.

android:

openBlas

62.96ms

esgemm

1027.59ms

Does anyone know the reason?

the both pc and S6 have 8 core , so the openblas use 8 threads.