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有谁知道为什么以下函数使用共享数据的16 432 B? 在我看来,这应该是:32x32x8x2 = 16 384乙Cuda ::输入函数共享数据
__global__ void matrixMulKernel(double *c, const double *a, const double *b, unsigned int size)
{
__shared__ double as[32][32];
__shared__ double bs[32][32];
unsigned int bx = blockIdx.x, by = blockIdx.y;
unsigned int tx = threadIdx.x, ty = threadIdx.y;
unsigned int row = bx * TILE_WIDTH + tx;
unsigned int col = by * TILE_WIDTH + ty;
double Pval = 0.0;
for(unsigned int q = 0; q < size/TILE_WIDTH; q++)
{
as[tx][ty] = a[row * size + q * TILE_WIDTH + ty];
bs[ty][tx] = b[(q * TILE_WIDTH + tx) * size + col];
__syncthreads();
for(unsigned int k = 0; k < TILE_WIDTH; k++)
Pval += as[tx][k] * bs[k][ty];
__syncthreads();
}
c[row * size + col] = Pval;
}
编译器是给下面的错误:
Entry function '_Z15matrixMulKernelPdPKdS1_j' uses too much shared data (0x4030 bytes, 0x4000 max)
我很感兴趣,为什么会是这样,而不是作为一种解决方法:)
谢谢罗伯特。我已经编译了nvcc -arch = sm_30。我只是好奇它为什么这样工作。问候 – b1es