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I used code like
#define BLOCK_SIZE 32
to determine block size for kernel function.
Is there any way to detect reasonable block size for kernel function at the time when program runs?
When running the kernel, the intrinsic variable gridDim contains the block size. (It corresponds to special read-only registers in the hardware.)
It is 3D, so you have to write gridDim.x, grimDim.y, or grimDim.z.