CUDA：3D网格中的全局唯一线程索引 [英] CUDA : Global unique thread index in a 3D Grid

问题描述

正如问题所述，如果我有3D块网格，则为一个线程获取全局唯一索引的公式是什么？

As the question states, If I have a 3D Grid of Blocks what is the formula to get a global unique index for one thread ?

让块本身保持一维。

推荐答案

// unique block index inside a 3D block grid
const unsigned long long int blockId = blockIdx.x //1D
        + blockIdx.y * gridDim.x //2D
        + gridDim.x * gridDim.y * blockIdx.z; //3D

// global unique thread index, block dimension uses only x-coordinate
const unsigned long long int threadId = blockId * blockDim.x + threadIdx.x;

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