cuda 入门 threadIdx

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三维 grid block

dim3 block(2, 2, 2);
dim3 grid(2, 2, 2);

访问下标

__global__ void mem_trans(int* input)
{int threadId_3D = threadIdx.x + threadIdx.y * blockDim.x +threadIdx.z * blockDim.x * blockDim.y;int blockId_3D = blockIdx.x + blockIdx.y * gridDim.x +blockIdx.z * gridDim.x * gridDim.y;int gid = threadId_3D + (blockDim.x * blockDim.y * blockDim.z) * blockId_3D;printf("tid : %d, gid : %d, value : %d\n",threadIdx.x, gid, input[gid]);
}

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