Cuda: If I use only .x block and threads, will it use all available threads in the GPU or for use with the .y and .z stream and block?

Question

I have my program, which requires maximum use of the GPU.

So, blockDim.x * blockIdx.x + threadIdx.x; has access to all threads? or is it necessary to use .y and .z also? is required?

Answer 1

CUDA - , , , , , . , .

2,2.

threadIdx , , , , . , , .

: http://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#thread-hierarchy

Answer 2

, , , . , .x. . 1 2 3.