CUDA 编程面试问题 [关闭]

CUDA（Compute Unified Device Architecture）是一种并行计算平台和应用程序编程接口，用于利用GPU（图形处理器）进行高性能计算。在进行CUDA编程面试时，面试官通常会提出一些问题来测试候选人的CUDA编程知识和经验。本文将通过回答几个常见的CUDA编程面试问题来介绍CUDA编程的基本概念和技术，并附上相应的案例代码。

cpp
__global__ void matrixMul(int* A, int* B, int* C, int N) {
    // 使用共享内存来存储矩阵数据
    __shared__ int shared_A[BLOCK_SIZE][BLOCK_SIZE];
    __shared__ int shared_B[BLOCK_SIZE][BLOCK_SIZE];
    int tx = threadIdx.x;
    int ty = threadIdx.y;
    int bx = blockIdx.x;
    int by = blockIdx.y;
    int row = by * blockDim.y + ty;
    int col = bx * blockDim.x + tx;
    int sum = 0;
    for (int i = 0; i < N / BLOCK_SIZE; i++) {
        shared_A[ty][tx] = A[row * N + i * BLOCK_SIZE + tx];
        shared_B[ty][tx] = B[(i * BLOCK_SIZE + ty) * N + col];
        __syncthreads();
        for (int j = 0; j < BLOCK_SIZE; j++) {
            sum += shared_A[ty][j] * shared_B[j][tx];
        }
        __syncthreads();
    }
    C[row * N + col] = sum;
}