Question

我在LINUX下安装了CUDA，大部分时间下面这个简单的代码会引发错误..

// Kernel that executes on the CUDA device
__global__ void square_array(float *a, int N)
{
  int idx = blockIdx.x * blockDim.x + threadIdx.x;
  if (idx<N) a[idx] = a[idx] * a[idx];
}

// main routine that executes on the host
int main(void)
{
    cudaSetDevice(0);
    cudaDeviceSynchronize();
    cudaThreadSynchronize();
    cudaError_t cudaError;



    float *a_h, *a_d;  // Pointer to host & device arrays
    const int N = 10;  // Number of elements in arrays
    size_t size = N * sizeof(float);
    a_h = (float *)malloc(size);        // Allocate array on host
    cudaError=cudaMalloc((void **) &a_d, size);   // Allocate array on device
    if(cudaError!=cudaSuccess)
    {
    printf("asdasd1");
    }
    //// Initialize host array and copy it to CUDA device
    for (int i=0; i<N; i++) a_h[i] = (float)i;
    cudaError=cudaMemcpy(a_d, a_h, size, cudaMemcpyHostToDevice);
    if(cudaError!=cudaSuccess)
    {
    printf("asdasd2");
    }
    //// Do calculation on device:
    int block_size = 4;
    int n_blocks = N/block_size + (N%block_size == 0 ? 0:1);
    square_array <<< n_blocks, block_size >>> (a_d, N);
    //// Retrieve result from device and store it in host array
    cudaMemcpy(a_h, a_d, sizeof(float)*N, cudaMemcpyDeviceToHost);
    //// Print results
    for (int i=0; i<N; i++) printf("%d %f\n", i, a_h[i]);
    //// Cleanup
    free(a_h); cudaFree(a_d);

我用以下代码编译它：nvcc pi.cu -arch = sm_11 -o asd.out 我在Windows上遇到同样的问题，那可能是什么问题？

Answer 1

从你所有的那些暗示之后我重新安装了NVIDIA驱动程序和CUDA;）我认为它有效;））

Mon Dec 15 23:43:23 2014       
+------------------------------------------------------+                       
| NVIDIA-SMI 340.29     Driver Version: 340.29         |                       
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce 8500 GT     Off  | 0000:01:00.0     N/A |                  N/A |
| N/A   66C    P0    N/A /  N/A |     53MiB /   511MiB |     N/A      Default |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Compute processes:                                               GPU Memory |
|  GPU       PID  Process name                                     Usage      |
|=============================================================================|
|    0            Not Supported                                               |
+-----------------------------------------------------------------------------+

代码不会抛出任何错误;） THX ALL：））

Cuda总是抛出错误

1 个答案: