我的问题是CUDA memcpy从设备复制到主机 . 我的程序使用用C＃CUDA包装类编写的GUI和用cudaC编写的核心cuda逻辑 .
这是c＃中负责启动所有内容的主要代码：
int[] imgData = srcImg.RgbData8bitInt;
int[] patData = pattern.PatternData;
int[] maskData = pattern.MaskData;
int[] Accumulator = new int[srcImg.Width * srcImg.Height];
IntPtr A_dev = CUDA.MallocInt(srcImg.Width * srcImg.Height);
IntPtr Img_dev = CUDA.MallocInt(imgData.Length);
CUDA.MemcpyToDevice(imgData, Img_dev, imgData.Length);
IntPtr Pat_dev = CUDA.MallocInt(patData.Length);
CUDA.MemcpyToDevice(patData, Pat_dev, patData.Length);
IntPtr Mask_dev = CUDA.MallocInt(maskData.Length);
CUDA.MemcpyToDevice(maskData, Mask_dev, maskData.Length);
int gridSizeX = (srcImg.Width - pattern.Image.Width) / 256 + 1;
int gridSizeY = srcImg.Height - pattern.Image.Width;
int imageWidth = srcImg.Width;
CUDA.Execute(status, gridSizeX, gridSizeY, A_dev, Img_dev, Pat_dev, Mask_dev, imageWidth);
CUDA.SynchronizeContext();
CUDA.MemcpyToHost(Accumulator, A_dev, Accumulator.Length);
顺便说一句 . CUDA.SynchronizeContext（）是cudaThreadSynchronize（）的包装器;
有问题的部分是最后一行，负责将值从设备复制回主机 .
[DllImport(dllPath, CharSet = CharSet.Ansi, SetLastError = true, CallingConvention = CallingConvention.StdCall)]
private static extern int memcpyToHost(int[] srcPtr, IntPtr devPtr, int size);
extern "C" int __declspec(dllexport) __stdcall memcpyToHost(int* host, int* dev, int size)
{
if (dev == 0) return 1;
cudaError_t status = cudaMemcpy(host, dev, size * sizeof(int), cudaMemcpyDeviceToHost);
if (status == cudaSuccess)
return 0;
else
return 1;
}
我在调试时得到的错误状态是：cudaErrorInvalidValue
分配内存和复制到设备似乎没问题，我已经调试过了 . 我在这里完全不知所措，也许有人遇到过类似的问题？
EDIT: SOLVED 见评论
1 回答
问题是cudaDeviceReset（）;在内核调用之后放置 .