这是我的第一个问题,所以我会尽量做到尽可能详细。我正在CUDA 6.5中实施降噪算法。我的代码基于这个Matlab实现:http://pastebin.com/HLVq48C1。
我很想使用新的cuFFT设备回调功能,但我卡在cufftXtSetCallback。每次我的cufft结果是CUFFT_NOT_IMPLEMENTED(14)。即使是由NVIDIA提供的示例失败同样的方式... 我的设备回调测试代码:使用“cuFFT设备回调”
__device__ void noiseStampCallback(void *dataOut,
size_t offset,
cufftComplex element,
void *callerInfo,
void *sharedPointer) {
element.x = offset;
element.y = 2;
((cufftComplex*)dataOut)[offset] = element;
}
__device__ cufftCallbackStoreC noiseStampCallbackPtr = noiseStampCallback;
我的代码
CUDA部分:
cufftHandle forwardFFTPlan;//RtC
//find how many windows there are
int batch = targetFile->getNbrOfNoiseWindows();
size_t worksize;
cufftCreate(&forwardFFTPlan);
cufftMakePlan1d(forwardFFTPlan, WINDOW, CUFFT_R2C, batch, &worksize); //WINDOW = 2048
//host memory, allocate
float *h_wave;
cufftComplex *h_complex_waveSpec;
unsigned int m_num_real_elems = batch*WINDOW*2;
h_wave = (float*)malloc(m_num_real_elems * sizeof(float));
h_complex_waveSpec = (cufftComplex*)malloc((m_num_real_elems/2+1)*sizeof(cufftComplex));
//init
memset(h_wave, 0, sizeof(float) * m_num_real_elems); //last window won't probably be full of file data, so fill memory with 0
memset(h_complex_waveSpec, 0, sizeof(cufftComplex) * (m_num_real_elems/2+1));
targetFile->getNoiseFile(h_wave); //fill h_wave with samples from sound file
//device memory, allocate, copy from host
float *d_wave;
cufftComplex *d_complex_waveSpec;
cudaMalloc((void**)&d_wave, m_num_real_elems * sizeof(float));
cudaMalloc((void**)&d_complex_waveSpec, (m_num_real_elems/2+1) * sizeof(cufftComplex));
cudaMemcpy(d_wave, h_wave, m_num_real_elems * sizeof(float), cudaMemcpyHostToDevice);
//prepare callback
cufftCallbackStoreC hostNoiseStampCallbackPtr;
cudaMemcpyFromSymbol(&hostNoiseStampCallbackPtr,
noiseStampCallbackPtr,
sizeof(hostNoiseStampCallbackPtr));
cufftResult status = cufftXtSetCallback(forwardFFTPlan,
(void **)&hostNoiseStampCallbackPtr,
CUFFT_CB_ST_COMPLEX,
NULL);
//always return status 14 - CUFFT_NOT_IMPLEMENTED
//run forward plan
cufftResult result = cufftExecR2C(forwardFFTPlan, d_wave, d_complex_waveSpec);
//result seems to be okay without cufftXtSetCallback
我知道,我只是一个初学者在CUDA中。我的问题是:
如何正确调用cufftXtSetCallback,或者导致此错误的原因是什么?
你说得对。我错过的这个笔记的唯一部分是64位LINUX。好的,谢谢你的帮助! – Ghany 2014-09-13 15:55:10
我们知道这些限制令人讨厌,我们正在努力在未来的版本中删除其中的一些。它们是出于技术原因而存在的,所以需要一些工程来解决它们。敬请期待... – 2014-09-21 01:59:58
我发现这个网页对设置静态链接代码以及获取许可证更为明确。该网页还表示,未来将取消许可证。 http://devblogs.nvidia.com/parallelforall/cuda-pro-tip-use-cufft-callbacks-custom-data-processing/ – MrMas 2015-09-01 18:29:35