Reading Complex data into performVulkanFFT #25

TheGitHubGuy1 · 2021-04-13T00:33:33Z

Hi,

I am assigning an array of floats formatted like [real number, imaginary number, real number, imaginary number, ...] to an input buffer, I am reading in 8192 complex samples (16384 floats in total). Each pair of real and imaginary in the array represent a complex type. I then perform a transform on the data performVulkanFFT and the values returned by the output buffer aren't what I expect. How does performVulkanFFT expect complex data to be assigned to the input_buffer? and how is complex data written to the output_buffer?

uint32_t res = 0; 
std::ifstream in;
in.open("fftData.iq", std::ios::in | std::ios::binary);

if(in.is_open()) {
  // memory allocated on the CPU once, makes benchmark completion faster + avoids performance issues connected to frequent allocation/deallocation.
  float* buffer_input = (float*)malloc(2*(sizeof(float)*8192));
  
  in.seekg(0, std::ios::end);
  const size_t num_elements = in.tellg() / sizeof(float);
  in.seekg(0, std::ios::beg);
  
  std::vector<float> data(num_elements);
  in.read(reinterpret_cast<char*>(&data[0]), num_elements*sizeof(float));
  
  printf("number of floats %i \n", data.size());
  
  for(size_t i = 0; i < 30; ++i)
  {
	  printf("%f \n",data[i]);
  }
  
  for(size_t i = 0; i < data.size(); ++i)
  {
	  buffer_input[i] = data[i];
  }
  
  std::cout << "ln:664" << std::endl;
  
  VkFFTConfiguration configuration = {};
  VkFFTApplication app = {};
  configuration.FFTdim = 1; //FFT dimension, 1D, 2D or 3D (default 1).
  
  //Multidimensional FFT dimensions sizes (default 1). For best performance (and stability), order dimensions in descendant size order as: x>y>z.
  configuration.size[0] = 8192;
  configuration.size[1] = 1;
  configuration.size[2] = 1;
  
  std::cout << "ln:674" << std::endl;
  
  // After this, configuration file contains pointers to Vulkan objects needed to work with the GPU: 
  // VkDevice* device - created device, 
  // [uint64_t *bufferSize, VkBuffer *buffer, VkDeviceMemory* bufferDeviceMemory] - allocated GPU memory FFT is performed on. 
  // [uint64_t *kernelSize, VkBuffer *kernel, VkDeviceMemory* kernelDeviceMemory] - allocated GPU memory, where kernel for convolution is stored.
  configuration.device = &vkGPU->device;
  
  // to allocate memory for LUT, we have to pass a queue, vkGPU->fence, commandPool and physicalDevice pointers 
  configuration.queue = &vkGPU->queue; 
  configuration.fence = &vkGPU->fence;
  configuration.commandPool = &vkGPU->commandPool;
  configuration.physicalDevice = &vkGPU->physicalDevice;
  
  // compiler can be initialized before VkFFT plan creation. if not, VkFFT will create and destroy one after initialization
  configuration.isCompilerInitialized = isCompilerInitialized;
  
  std::cout << "ln:691" << std::endl;
  
  // Allocate buffer for the input data.
  uint64_t bufferSize = (uint64_t)(2*(sizeof(float)*8192));
  VkBuffer buffer = {};
  VkDeviceMemory bufferDeviceMemory = {};
  allocateFFTBuffer(vkGPU, &buffer, &bufferDeviceMemory, VK_BUFFER_USAGE_STORAGE_BUFFER_BIT | 
  VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT, 
  VK_MEMORY_HEAP_DEVICE_LOCAL_BIT, bufferSize);
  configuration.buffer = &buffer;
  configuration.bufferSize = &bufferSize;
  
  // Sample buffer transfer tool. 
  // Uses staging buffer of the same size as destination buffer, which can be reduced if transfer is done sequentially in small buffers.
  transferDataFromCPU(vkGPU, buffer_input, &buffer, bufferSize);
  
  // Initialize applications. 
  // This function loads shaders, creates pipeline and configures FFT based on configuration file. 
  // No buffer allocations inside VkFFT library.  
  res = initializeVkFFT(&app, configuration);
  if (res != 0) return res;
  
  uint32_t num_iter = 1;
  performVulkanFFT(vkGPU, &app, -1, num_iter);
  
  float* buffer_output = (float*)malloc(2*(sizeof(float)*8192));
  transferDataToCPU(vkGPU, buffer_output, &buffer, bufferSize);
  
  for (int x=0; x < 30; x++) {
	  printf("value: %f \n", buffer_output[x]);
  }
  
  std::ofstream myfile;
  myfile.open ("output.csv");
  for (int x=0; x < 8192; x++) {
	  myfile << std::to_string(buffer_output[x])+"\n";
  }
  myfile.close();
  
  //Clean up 
  vkDestroyBuffer(vkGPU->device, buffer, NULL);
  vkFreeMemory(vkGPU->device, bufferDeviceMemory, NULL);
  deleteVkFFT(&app);
  free(buffer_input);
  free(buffer_output);
}

The text was updated successfully, but these errors were encountered:

DTolm · 2021-04-13T03:35:56Z

Hello,
Can you please share the input data, the output data, the data you expected and the GPU name so I can check it? Thank you!
Best regards,
Dmitrii

TheGitHubGuy1 · 2021-04-13T06:37:18Z

Hi Dmitrii,

Ok. The input data is just test sample data generated by gnu radio in IQIQIQ.. format, i've provided it as fftData.iq The data I expect is close to the cufft_output.csv I am providing (I have confirmed that data is good, it was generated by a NVIDIA device and their cuda library with the same input data). The output data generated by performVulkanFFT is attached as vkfft_output.csv.

data.zip

TheGitHubGuy1 · 2021-04-13T07:03:18Z

Re GPU name, it's the vulcan processor in the raspberry pi 4.

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FORMAT_ASTC_6x5_SRGB_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_6x6_UNORM_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_6x6_SRGB_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_8x5_UNORM_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_8x5_SRGB_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_8x6_UNORM_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_8x6_SRGB_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_8x8_UNORM_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_8x8_SRGB_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_10x5_UNORM_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_10x5_SRGB_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_10x6_UNORM_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_10x6_SRGB_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_10x8_UNORM_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_10x8_SRGB_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_10x10_UNORM_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_10x10_SRGB_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_12x10_UNORM_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_12x10_SRGB_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_12x12_UNORM_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_ASTC_12x12_SRGB_BLOCK:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G8B8G8R8_422_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_B8G8R8G8_422_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G8_B8_R8_3PLANE_420_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G8_B8R8_2PLANE_420_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G8_B8_R8_3PLANE_422_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G8_B8R8_2PLANE_422_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G8_B8_R8_3PLANE_444_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_R10X6_UNORM_PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_R10X6G10X6_UNORM_2PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_R10X6G10X6B10X6A10X6_UNORM_4PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G10X6B10X6G10X6R10X6_422_UNORM_4PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_B10X6G10X6R10X6G10X6_422_UNORM_4PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G10X6_B10X6_R10X6_3PLANE_420_UNORM_3PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G10X6_B10X6R10X6_2PLANE_420_UNORM_3PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G10X6_B10X6_R10X6_3PLANE_422_UNORM_3PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G10X6_B10X6R10X6_2PLANE_422_UNORM_3PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G10X6_B10X6_R10X6_3PLANE_444_UNORM_3PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_R12X4_UNORM_PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_R12X4G12X4_UNORM_2PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_R12X4G12X4B12X4A12X4_UNORM_4PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G12X4B12X4G12X4R12X4_422_UNORM_4PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_B12X4G12X4R12X4G12X4_422_UNORM_4PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G12X4_B12X4_R12X4_3PLANE_420_UNORM_3PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G12X4_B12X4R12X4_2PLANE_420_UNORM_3PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G12X4_B12X4_R12X4_3PLANE_422_UNORM_3PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G12X4_B12X4R12X4_2PLANE_422_UNORM_3PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G12X4_B12X4_R12X4_3PLANE_444_UNORM_3PACK16:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G16B16G16R16_422_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_B16G16R16G16_422_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G16_B16_R16_3PLANE_420_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G16_B16R16_2PLANE_420_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G16_B16_R16_3PLANE_422_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G16_B16R16_2PLANE_422_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

FORMAT_G16_B16_R16_3PLANE_444_UNORM:
	linearTiling   FormatFeatureFlags:
		None
	optimalTiling  FormatFeatureFlags:
		None
	bufferFeatures FormatFeatureFlags:
		None

DTolm · 2021-04-13T07:09:38Z

Hm, I get the same result in cuFFT as in VkFFT (starting with 7836 and 2061)
You can check it if you add the following code before cout about line 664:

#ifdef USE_cuFFT
			uint32_t dims[4] = {8192,1,1,1};
			float* output_extFFT = (float*)(malloc(2*sizeof(float) * dims[0] * dims[1] * dims[2]));
			launch_precision_cuFFT_single(buffer_input, (void*)output_extFFT, dims);
			for (int x=0; x < 30; x++) {
				printf("value: %f \n", output_extFFT[x]);
			}
#endif // USE_cuFFT

Maybe there is some issue with data reading/processing?
Best regards,
Dmitrii

DTolm · 2021-09-21T14:34:58Z

Closed, as the issue has not been active.

DTolm closed this as completed Sep 21, 2021

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Reading Complex data into performVulkanFFT #25

Reading Complex data into performVulkanFFT #25

TheGitHubGuy1 commented Apr 13, 2021

DTolm commented Apr 13, 2021

TheGitHubGuy1 commented Apr 13, 2021

TheGitHubGuy1 commented Apr 13, 2021

DTolm commented Apr 13, 2021 •

edited

DTolm commented Sep 21, 2021

Reading Complex data into performVulkanFFT #25

Reading Complex data into performVulkanFFT #25

Comments

TheGitHubGuy1 commented Apr 13, 2021

DTolm commented Apr 13, 2021

TheGitHubGuy1 commented Apr 13, 2021

TheGitHubGuy1 commented Apr 13, 2021

DTolm commented Apr 13, 2021 • edited

DTolm commented Sep 21, 2021

DTolm commented Apr 13, 2021 •

edited