【发布时间】:2015-01-21 16:12:25
【问题描述】:
我有一张 GPU 卡 GeForce GTX 295 和 Visual Studio 2012 以及 6.5 版的 cuda。我运行一个简单的代码,如
#include "stdafx.h"
#include <stdio.h>
#include <cuda.h>
// 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)
{ 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
cudaMalloc((void **) &a_d, size); // Allocate array on device // Initialize host array and copy it to CUDA device
for (int i=0; i<N; i++) a_h[i] = (float)i;
cudaMemcpy(a_d, a_h, size, cudaMemcpyHostToDevice); // 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); }
在这段代码中,当我在调用内核后使用命令 cudaGetLastError (void) 时,在控制台窗口显示错误“Invalid device function”。我该如何摆脱它?
cuda kit 6.5的示例代码正在Visual Studio 2012上成功运行。enter code here
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