Question

CUDA中数组求最大值

Answer 1

cudaMallocPitch()
cudaMemcpy2D()
Get threadIdx blockIdx to access to each element, you might need to check the definition of pitch before you start to work on 2D matrix. It makes sure that the allocation is appropriatedly padded to meet the memory alignment requirements.

// Host code
int width = 64, height = 64;
float* devPtr;
size_t pitch;
cudaMallocPitch(&devPtr, &pitch, width * sizeof(float), height);
MyKernel<<<100, 512>>>(devPtr, pitch, width, height);

// Device code
__global__ void MyKernel(float* devPtr, size_t pitch, int width, int height)
{
for (int r = 0; r < height; ++r)
{
float* row = (float*)((char*)devPtr + r * pitch);
for (int c = 0; c < width; ++c)
{ float element = row[c]; }
}
}

It would be easier to use 1D as a start point