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我无法在此短cuda代码中获得分段错误的来源。 我正在使用它来测试Thrust库与STL库的排序速度,排序整数为 。我传递的数组大小作为命令行 参数进行排序。在小代码中查找seg错误
下面是代码
inline void check_cuda_error(char *message)
{
cudaThreadSynchronize();
cudaError_t error = cudaGetLastError();
if(error != cudaSuccess)
{
printf("CUDA error after %s: %s\n", message, cudaGetErrorString(error));
}
}
int main(int argc, char *argv[])
{
int N = atoi(argv[1]);
double* h = new double[N];
for (int i = 0; i < N; ++i)
{
h[i] = (double)rand()/RAND_MAX; //std::cout << h[i] << " " ;
}
clock_t start , stop;
std::cout << std::endl;
// Start timing
start = clock();
std::sort(h, h+N);
stop = clock();
std::cout << "Host sorting took " << (stop - start) /(double)CLOCKS_PER_SEC << std::endl ;
// Start the GPU work. Initialize to random numbers again.
for (int i = 0; i < N; ++i)
{
h[i] = (double)rand()/RAND_MAX; //std::cout << h[i] << " " ;
}
double* d = 0;
const size_t num_bytes = N * sizeof(double);
cudaMalloc((void**)&d, num_bytes);
check_cuda_error("Memory Allocation");
cudaMemcpy(d ,h , N * sizeof(double), cudaMemcpyHostToDevice); // Transfer data
thrust::sort(d, d+ N) ;
return 0;
}
我收到以下错误
[BeamerLatex/Farber]$ nvcc -arch=sm_20 sortcompare.cu ; ./a.out 16777216
Host sorting took 3.77
[1] 4661 segmentation fault ./a.out 16777216
[BeamerLatex/Farber]$
不相关,但你不删除'h' ... –
你可以添加你的包括?我cba谷歌他们所有,这将有助于我有一个运行版本的代码 – sji
只是一个猜测,但是,你可以请检查cudaMalloc的returnvalue。如果是cudaErrorMemoryAllocation,那么对cudaMemcpy的调用很可能会失败,因为目标仍然是0.这通常会导致段错误。 –