dim3 grid(3, 2); dim3 block(5, 3);

可以轉置一下理解

#include <stdio.h> #include <iostream> using namespace std;__global__ void hello_from_gpu() {const int b = blockIdx.x;const int c = blockIdx.y;const int tx = threadIdx.x;const int ty = threadIdx.y;// cout<<b<<endl;printf("Hello World from block-(%d,%d) and thread-(%d, %d)!\n", b,c, tx, ty); }int main(void) {const dim3 grid(3, 2);const dim3 block(5, 3);//const dim3 block_size(2, 4);hello_from_gpu<<<grid, block>>>();cudaDeviceSynchronize();return 0; } dim3 grid(3, 2); dim3 block(5, 3); nvcc hello5.cu ./a.out Hello World from block-(2,0) and thread-(0, 0)! Hello World from block-(2,0) and thread-(1, 0)! Hello World from block-(2,0) and thread-(2, 0)! Hello World from block-(2,0) and thread-(3, 0)! Hello World from block-(2,0) and thread-(4, 0)! Hello World from block-(2,0) and thread-(0, 1)! Hello World from block-(2,0) and thread-(1, 1)! Hello World from block-(2,0) and thread-(2, 1)! Hello World from block-(2,0) and thread-(3, 1)! Hello World from block-(2,0) and thread-(4, 1)! Hello World from block-(2,0) and thread-(0, 2)! Hello World from block-(2,0) and thread-(1, 2)! Hello World from block-(2,0) and thread-(2, 2)! Hello World from block-(2,0) and thread-(3, 2)! Hello World from block-(2,0) and thread-(4, 2)! Hello World from block-(0,0) and thread-(0, 0)! Hello World from block-(0,0) and thread-(1, 0)! Hello World from block-(0,0) and thread-(2, 0)! Hello World from block-(0,0) and thread-(3, 0)! Hello World from block-(0,0) and thread-(4, 0)! Hello World from block-(0,0) and thread-(0, 1)! Hello World from block-(0,0) and thread-(1, 1)! Hello World from block-(0,0) and thread-(2, 1)! Hello World from block-(0,0) and thread-(3, 1)! Hello World from block-(0,0) and thread-(4, 1)! Hello World from block-(0,0) and thread-(0, 2)! Hello World from block-(0,0) and thread-(1, 2)! Hello World from block-(0,0) and thread-(2, 2)! Hello World from block-(0,0) and thread-(3, 2)! Hello World from block-(0,0) and thread-(4, 2)! Hello World from block-(0,1) and thread-(0, 0)! Hello World from block-(0,1) and thread-(1, 0)! Hello World from block-(0,1) and thread-(2, 0)! Hello World from block-(0,1) and thread-(3, 0)! Hello World from block-(0,1) and thread-(4, 0)! Hello World from block-(0,1) and thread-(0, 1)! Hello World from block-(0,1) and thread-(1, 1)! Hello World from block-(0,1) and thread-(2, 1)! Hello World from block-(0,1) and thread-(3, 1)! Hello World from block-(0,1) and thread-(4, 1)! Hello World from block-(0,1) and thread-(0, 2)! Hello World from block-(0,1) and thread-(1, 2)! Hello World from block-(0,1) and thread-(2, 2)! Hello World from block-(0,1) and thread-(3, 2)! Hello World from block-(0,1) and thread-(4, 2)! Hello World from block-(2,1) and thread-(0, 0)! Hello World from block-(2,1) and thread-(1, 0)! Hello World from block-(2,1) and thread-(2, 0)! Hello World from block-(2,1) and thread-(3, 0)! Hello World from block-(2,1) and thread-(4, 0)! Hello World from block-(2,1) and thread-(0, 1)! Hello World from block-(2,1) and thread-(1, 1)! Hello World from block-(2,1) and thread-(2, 1)! Hello World from block-(2,1) and thread-(3, 1)! Hello World from block-(2,1) and thread-(4, 1)! Hello World from block-(2,1) and thread-(0, 2)! Hello World from block-(2,1) and thread-(1, 2)! Hello World from block-(2,1) and thread-(2, 2)! Hello World from block-(2,1) and thread-(3, 2)! Hello World from block-(2,1) and thread-(4, 2)! Hello World from block-(1,1) and thread-(0, 0)! Hello World from block-(1,1) and thread-(1, 0)! Hello World from block-(1,1) and thread-(2, 0)! Hello World from block-(1,1) and thread-(3, 0)! Hello World from block-(1,1) and thread-(4, 0)! Hello World from block-(1,1) and thread-(0, 1)! Hello World from block-(1,1) and thread-(1, 1)! Hello World from block-(1,1) and thread-(2, 1)! Hello World from block-(1,1) and thread-(3, 1)! Hello World from block-(1,1) and thread-(4, 1)! Hello World from block-(1,1) and thread-(0, 2)! Hello World from block-(1,1) and thread-(1, 2)! Hello World from block-(1,1) and thread-(2, 2)! Hello World from block-(1,1) and thread-(3, 2)! Hello World from block-(1,1) and thread-(4, 2)! Hello World from block-(1,0) and thread-(0, 0)! Hello World from block-(1,0) and thread-(1, 0)! Hello World from block-(1,0) and thread-(2, 0)! Hello World from block-(1,0) and thread-(3, 0)! Hello World from block-(1,0) and thread-(4, 0)! Hello World from block-(1,0) and thread-(0, 1)! Hello World from block-(1,0) and thread-(1, 1)! Hello World from block-(1,0) and thread-(2, 1)! Hello World from block-(1,0) and thread-(3, 1)! Hello World from block-(1,0) and thread-(4, 1)! Hello World from block-(1,0) and thread-(0, 2)! Hello World from block-(1,0) and thread-(1, 2)! Hello World from block-(1,0) and thread-(2, 2)! Hello World from block-(1,0) and thread-(3, 2)! Hello World from block-(1,0) and thread-(4, 2)!

所以，一個線程需要兩個內置的坐標變量（blockIdx，threadIdx）來唯一標識，它們都是dim3類型變量，其中blockIdx指明線程所在grid中的位置，而threaIdx指明線程所在block中的位置，如圖中的Thread (1,1)滿足：

總結

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