ATS-GPU-BASE Programmer’s guide

Note

This is the documentation for AlazarTech’s ATS-GPU version 24.1.0. Please visit our documentation homepage to find documentation for other versions or products.

License Agreement

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Introduction

The ATS-GPU SDK provides a framework to allow real-time processing of data from AlazarTech PCIe digitizers on a CUDA-enabled GPU. This programmer’s guide covers the use of ATS-GPU-BASE.

ATS-GPU-BASE internally calls ATS-CUDA, which is a wrapper library for simple CUDA calls. ATS-CUDA is described in more detail later in this guide in the section ATS-CUDA.

This document assumes that the reader is familiar with ATS-SDK, the standard interface for programming AlazarTech digitizers. Having a copy of the ATS-SDK manual available can be helpful, since many references to ATSApi functions are done here. The latest version of the ATS-SDK manual can be downloaded free of charge from AlazarTech’s website.

In addition, expertise in CUDA programming is assumed. This is particularly important for users wishing to use ATS-GPU-BASE, because this task involves CUDA programming.

It is also essential for programmers to have in-depth knowledge of GPU architecture and parallel programming.

Prerequisites

System requirements

This software requires a PC with a CUDA-enabled GPU, and sufficient CPU resources to supply data to the GPU at the desired data acquisition rate. It was tested with GeForce GTX Titan X (Maxwell), GeForce GTX980 and Quadro P5000. DDR4 memory and a modern chipset (X99, X299) will greatly improve transfer speed and overall performance.

Supported operating systems

64-bit Windows and 64-bit Linux operating systems are supported. Please verify that your Linux distribution is supported by NVIDIA , which supplies the CUDA toolkit required to use ATS-GPU.

Compiler support

CMake is required to build C/C++ code. CMake files are provided. On Linux, a C++11 compiler is required to build the library. On older Red Hat distributions, a devtoolset can be obtained to use a more recent version of gcc that supports C++11. NVCC is required to compile the example code, this compiler is included with CUDA toolkit.

CUDA driver requirements

In order to use ATS-GPU, you must install the appropriate driver for your CUDA-enabled GPU. Drivers can be downloaded at https://www.nvidia.com/Download/index.aspx.

Note

Under Windows operating systems, dynamic link libraries releated to ATS-GPU-BASE are installed by default in %WINDIR%System32. For applications to link approripately to them, %WINDIR%System32 must be added to the Windows PATH Environment Variable.

Programming experience

Users who wish to use ATS-GPU-BASE to create high-performance custom kernels must have expertise in CUDA programming.

It is also essential for programmers to have in-depth knowledge of GPU architecture and parallel programming.

ATS-GPU-BASE

ATS-GPU-BASE is designed to provide highly efficient code to transfer data from an ATS PCIe digitizer to a CUDA-enabled GPU for processing. This transfer is done using multiple DMA transactions. The user application, which includes custom CUDA kernels, can then access data buffers on the GPU. The user is then responsible to perform data processing and copy data back to the CPU if required. A code example is provided as an example of a user application that performs very simple signal processing (data inversion).

Usage

ATS-GPU-BASE offers several functions that behave similarly to ATSApi functions. Please refer to the ATS-SDK guide for more details about these APIs. Obtaining a board handle and configuring the board (sampling rate, trigger, input channels, etc.) is performed directly using functions from the ATS-SDK. By convention, the code samples define a ConfigureBoard() function that handles all these tasks.

if (!ConfigureBoard(boardHandle)) {
    // Error handling
}

During the lifetime of an application, multiple acquisitions can take place. If the board configuration parameters do not change, it is not necessary to call ConfigureBoard() again.

The next step is to select the CUDA-enabled GPU to use for the data transfer. This call is optional. If you only have one CUDA capable GPU on your computer, you can skip it.

rc = ATS_GPU_SetCUDAComputeDevice(boardHandle, deviceIndex);
// Error handling

We must then setup parameters of the acquisition to GPU. This function replaces the call to AlazarBeforeAsyncRead() in normal programs. Parameters were kept as close as possible to those of AlazarBeforeAsyncRead() to ease transition between standard acquisitions and ATS-GPU acquisitions. To maximize performance, sample interleave should be enabled with ADMA_INTERLEAVE_SAMPLES.

rc = ATS_GPU_Setup(boardHandle, channelSelect, transferOffset,
                   transferLength, recordsPerBuffer, recordsPerAcquisition,
                   autoDMAFlags, ATSGPUFlags);
// Error handling

We then allocate memory on the GPU for data to be transferred to, and we post those buffers to the board. For this purpose, we use ATS_GPU_AllocBuffer(). This function allocates a buffer on the GPU and sets up all the intermediary state necessary for ATS-GPU to successfully transfer data. Please note that if you would like to send data back from the GPU to your computer’s RAM after having processed it, you will need to allocate memory independently of the AlazarTech APIs.

for (size_t i = 0; i < buffers_to_allocate; i++)
{
    buffers[i] = ATS_GPU_AllocBuffer(boardHandle, bytesPerBuffer);

    rc =  ATS_GPU_PostBuffer(boardHandle,
                             buffers[i],
                             bytesPerBuffer);
    // Error handling
}

We can then start the acquisition. The board will directly start acquiring data, assuming it receives triggers, and data transfer to posted GPU buffers will also start immediately.

rc =  ATS_GPU_StartCapture(HANDLE boardHandle);
// Error handling

Once acquisition is started, ATS_GPU_GetBuffer() must be called as often as possible to retrieve a buffer containing data already copied on the GPU. This buffer can then be processed by your custom kernel on the GPU. When a buffer is done being used (either data has been copied to a different buffer or processing is complete), the buffer needs to be posted back to the board.

for (size_t i; i < buffers_per_acquisition; i++)
{
    rc =  ATS_GPU_GetBuffer(boardHandle,
                            buffers[i],
                            timeout_ms,
                            nullptr);

    // TODO: Error handling

    // TODO: Process buffer. This is where you can call your own processing
    //       function that launches the GPU kernels, such as ProcessBuffer()
    //       in the code samples.
    ProcessBuffer(buffers[i], bytesPerBuffer);

    rc = ATS_GPU_PostBuffer(boardHandle, buffer, bytesPerBuffer);
}

When acquisition is complete, ATS_GPU_AbortCapture() must be called. Buffers allocated with ATS_GPU_AllocBuffer() should then be freed with ATS_GPU_FreeBuffer().

RETURN_CODE ATS_GPU_AbortCapture(HANDLE boardHandle);

for (size_t i = 0; i < number_of_buffers; i++)
{
   rc = ATS_GPU_FreeBuffer(boardHandle, buffers[i]);
   // Error handling
}

Here is an example of what the function to process data on the GPU can look like. Since this contains code that is executed on the GPU, it needs to be located in a file with a .cu extension:

extern “C”__global__ void ProcessBuffer(void* buffer, bytesPerBuffer)
{
    int idx = blockDim.x * blockIdx.x + threadIdx.x;

    // TODO: Do processing here
}

Bool ProcessBuffer(void* buffer, U32 bytesPerBuffer)
{
    // Launch ProcessBuffer CUDA kernel
    ProcessBuffer<<<threadsPerBlock, BlocksPerGrid>>>(buffer, bytesPerBuffer);

    // Copy result from GPU memory to CPU memory
    cudaMemcpy(resultBuffer,buffer,bytesPerBuffer);
}

Performance guidelines

While GPU solutions are highly customizable and can reach very high processing speeds, care must be taken to preserve performance. The provided libraries use streams to maximise concurrency and hide latency associated with data transfers. The processing functions are optimized to provide the best performance and modifying them can result in a loss of performance. Refer to the CUDA best practices guide for more information on how to improve performance.

Warning

When developing CUDA code, it is very important to check memory accesses with a dedicated tool, as bad memory accesses will not necessarily trigger an error but will lead to bad behavior and can cause a crash. The CUDA toolkit provides the necessary memory checking utilities.

Because data is DMA’d from ATS board to host memory then to GPU memory, speed of host computer memory will influence performance. DDR4 memory and a modern chipset (X99, X299, etc.) will greatly improve transfer speed and overall performance.

Benchmarks

Performance benchmarks using the optional OCT signal processing library and NVIDIA GeForce GTX Titan X (Maxwell) GPU on an ASUS X99 Deluxe motherboard with an Intel i9-7900X 3.3 GHz CPU, and 2133 MHz DDR4 memory (32 GB RAM):

PCIe Link Speed	Transfer Rate
Gen 3x8: ATS9373, ATS9371	Up to 6.9 GB/s
Gen 2x8: ATS9360, ATS9416	Up to 3.5 GB/s
Gen 2x4: ATS9352 Gen 1x8: ATS9870, ATS9350, ATS9351, ATS9625, ATS9626, ATS9440	Up to 1.6 GB/s
Gen 1x4: ATS9462	Up to 720 MB/s
Gen 1x1: ATS9146, ATS9130, ATS9120	Up to 200 MB/s

API Reference

Note

Errors from ATS-GPU-BASE will be logged in ATS_GPU.log. Relevant information about the error will be logged here and can be useful for debugging. For Windows users log file is located in %TEMP%. For Linux users log file is located in /tmp/.

RETURN_CODE ATS_GPU_Setup(HANDLE boardHandle, U32 channelSelect, long transferOffset, U32 transferLength, U32 recordsPerBuffer, U32 recordsPerAcquisition, U32 autoDMAFlags, U32 ATSGPUFlags)

Prepares the ATS board and GPU for acquisition.

This function calls AlazarBeforeAsyncRead() internally and most parameters are passed directly to it. In addition, it sets up the GPU for DMA transfers

Parameters:

• boardHandle – Handle to the board.

• channelSelect – Channel mask with each channel identifier OR’d

• transferOffset – pass a negative integer for pretrigger samples

• transferLength – Number of samples in a record or transfer

• recordsPerBuffer – Number of records in a buffer, 1 for triggered streaming and continuous streaming modes.

• recordsPerAcquisition – Total number of records in the acquisition. Pass 0x7FFFFFFF for infinite.

• autoDMAFlags – ATSApi flags for AlazarBeforeAsyncRead

• ATSGPUFlags – Combination of elements from ATS_GPU_SETUP_FLAG OR’d together. Pass 0 for default

void *ATS_GPU_AllocBuffer(HANDLE boardHandle, U32 bytesPerBuffer, cudaStream_t *stream)

Allocates page-aligned pinned memory for ATS and GPU boards.

This function can be called after ATS_GPU_Setup to perform the necessary memory allocations. This function returns a GPU or CPU buffer pointer depending on ATS_GPU_SETUP_FLAG values used in the setup.

Parameters:

• boardHandle – Handle to the board

• bytesPerBuffer – Total number of bytes to allocate per buffer

• stream – CUDA stream associated to the allocated buffer.

RETURN_CODE ATS_GPU_PostBuffer(HANDLE boardHandle, void *buffer, U32 bytesPerBuffer)

Signal the library a particular buffer can be used for data transfer.

This function is the equivalent of AlazarPostAsyncBuffer for ATS_GPU. Buffers posted must have previously been allocated with ATS_GPU_AllocBuffer.

Parameters:

• boardHandle – Handle to the board

• buffer – Pointer to a previously allocated buffer

• bytesPerBuffer – Size in bytes of the buffer, must be the same size as setup for the acquisition.

RETURN_CODE ATS_GPU_GetBuffer(HANDLE boardHandle, void *buffer, U32 timeout_ms, cudaStream_t *stream)

Get processed buffer.

This function must be called at average rate that is equal to or greater than the rate at which DMA buffers complete. This function returns the GPU-processed buffer.

Parameters:

• boardHandle – Handle to the board

• buffer – Pointer to the buffer

• timeout_ms – Time the board will wait for a trigger before throwing an error.

• stream – CUDA stream associated to the processed buffer. Subsequent processing of processed buffer should occurs on this CUDA stream.

Returns:

ApiSuccess (512) if the board received sufficient triggers to fill a DMA buffer.

Returns:

ApiNotInitialized if ATS_StartCapture was not called before calling this function, or it was called and failed.

Returns:

ApiInvalidHandle The boardHandle parameter is not valid.

Returns:

ApiBufferOverflow if the board filled all the available DMA buffers and its on-board memory. This may happen if the acquisition rate exceeds the bus bandwidth or the GPU processing bandwidth.

Returns:

ApiWaitTimeout if the timeout interval expired before the board received a sufficient number of triggers to fill a buffer.

Returns:

ApiFailed if a system of internal error occurred.

RETURN_CODE ATS_GPU_AbortCapture(HANDLE boardHandle)

Stops the acquisition.

Aborts an acquisition, stops data processing, and releases resources allocated by ATS_GPU_Setup()

Parameters:

boardHandle – Handle to the board

Returns:

ApiSuccess

RETURN_CODE ATS_GPU_FreeBuffer(HANDLE boardHandle, void *buffer)

Free buffers allocated with ATS_GPU_AllocBuffer();.

Parameters:

• boardHandle – Handle to the board

• buffer – Buffer pointer allocated by ATS_GPU_AllocBuffer()

RETURN_CODE ATS_GPU_GenerateCPUBoxcarFunction(float *boxcarFunction, U32 samplesPerRecord, U32 gateDelay, U32 gateWidth)

Generates a boxcar gate on the CPU, of length samplesPerRecord.

Parameters:

• boxcarFunction – Array to be filled with the boxcar function. It must have a length of samplesPerRecord.

• samplesPerRecord – Samples per record.

• gateDelay – Delay of the boxcar gate in number of samples.

• gateWidth – Width of the boxcar gate in number of samples.

Returns:

Pointer to an array of float elements that contains the boxcar window generated on the CPU.

RETURN_CODE ATS_GPU_GetVersion(U8 *major, U8 *minor, U8 *revision)

Get ATS-GPU version number.

Parameters:

• major – ATS-GPU major version number.

• minor – ATS-GPU minor version number.

• revision – ATS-GPU revision number.

RETURN_CODE ATS_GPU_QueryCUDADeviceCount(U32 *pDeviceCount)

Function to get the number of available CUDA devices.

Parameters:

pDeviceCount – Outputs the number of devices detected on the system.

Returns:

ApiSuccess if it succeeded.

Returns:

ApiFailed if the GPU driver returned an error.

RETURN_CODE ATS_GPU_QueryCUDADeviceName(U32 deviceIndex, char *deviceName, int maxChars)

Function to get the name of a specific CUDA device.

Parameters:

• deviceIndex – 0-based index to the device.

• deviceName – Char array to output the name of the device.

• maxChars – Size of the char array.

Returns:

ApiSuccess if it succeeded.

Returns:

ApiFailed if the GPU driver returned an error.

Returns:

ApiInvalidIndex if the index provided is greater than the number of platforms or devices available.

RETURN_CODE ATS_GPU_SetCUDAComputeDevice(HANDLE boardHandle, U32 deviceIndex)

CUDA-specific function used to associate a CUDA-enabled GPU device with a digitizer board.

Allows you to specify which GPU should be used to process sample data from a digitizer, if more than one GPU is available.

Parameters:

• boardHandle – Handle to the ATS board.

• deviceIndex – 0-based index to the CUDA device.

Returns:

ApiSuccess if it succeeded.

Returns:

ApiFailed if it failed. See %TEMP%/ATS_GPU.log (/tmp/ATS_GPU.log under Linux) for more information.

enum ATS_GPU_SETUP_FLAG

GPU data transfer configuration options.

Values:

enumerator ATS_GPU_SETUP_FLAG_CPU_BUFFER

Makes ATS-GPU deliver CPU buffers instead of GPU ones. Useful for debugging

enumerator ATS_GPU_SETUP_FLAG_DEINTERLEAVE

De-interleave the data in the returned GPU buffer. Does not apply in conjunction with ATS_GPU_SETUP_FLAG_CPU_BUFFER

enumerator ATS_GPU_SETUP_FLAG_UNPACK

Unpack the data in the returned GPU buffer. It is required for the allocated buffers to be large enough to accommodate unpacked data. Does not apply in conjunction with ATS_GPU_SETUP_FLAG_CPU_BUFFER

struct _InputRange

Structure used to convert data to volts.

Public Members

float maxValue

Maximum input range value in volts.

float minValue

Minimum input range value in volts.

ATS-CUDA

The ATS-CUDA SDK provides a framework to allow users to perform simple manipulations on CUDA-enabled GPUs. ATS-CUDA is designed to be used with ATS-GPU-BASE, but can also be used independently. This section of the programmer’s guide covers the use of ATS-CUDA.

As with ATS-GPU-BASE, using ATS-CUDA requires expertise in CUDA programming because this involves writing custom CUDA kernels.

It is also essential for programmers to have in-depth knowledge of GPU architecture and parallel programming.

API Reference

Note

Errors from ATS-CUDA-BASE will be logged in ATS_GPU.log. Relevant information about the error will be logged here and can be useful for debugging. For Windows users log file is located in %TEMP%. For Linux users log file is located in /tmp/.

enum ATS_CUDA_Input_DataType

Input data types that can be provided.

Values:

enumerator ATS_CUDA_INPUT_FORMAT_U8

enumerator ATS_CUDA_INPUT_FORMAT_U16

enumerator ATS_CUDA_INPUT_FORMAT_FLOAT

enumerator ATS_CUDA_INPUT_FORMAT_COMPLEXFLOAT

enumerator ATS_CUDA_INPUT_FORMAT_S8

enumerator ATS_CUDA_INPUT_FORMAT_S16

enum ALAZAR_PACKING

Types of data packing.

Values:

enumerator PACKING_16_BITS_PER_SAMPLE

enumerator PACKING_12_BITS_PER_SAMPLE

enumerator PACKING_8_BITS_PER_SAMPLE

struct UNPACK_DEINTERLEAVE_OPTIONS

Structure used to set up unpacking and deinterleaving kernel used in ATS_CUDA_BaseProcessBuffer().

Public Members

bool unpack

Flag to activate unpacking;.

bool deinterleave

Flag to activate deinterleaving.

U32 transferLength

Number of samples per record per channel.

U32 recordsPerBuffer

Number of records per buffer per channel.

U32 channelCount

channelCount Number of active channels

ALAZAR_PACKING input_pack_mode

A member of ALAZAR_PACKING indicating the data packing mode of input buffer

ALAZAR_PACKING output_pack_mode

A member of ALAZAR_PACKING indicating the desired output data packing. Ignored if unpack is set to 0.

ALAZAR_INTERLEAVING input_interleave

A member of ALAZAR_INTERLEAVE indication the data interleaving of the input buffer

void *ATS_CUDA_AllocCPUBuffer(U32 bytesPerBuffer)

Allocates page-locked memory on the host computer.

This function is used to allocate host memory and is accessible to the device. Memory can be accessed directly by the device and can be written or read at high bandwidth.

Parameters:

bytesPerBuffer – Total number of bytes to allocate per buffer

Returns:

This function returns a CPU buffer pointer.

void *ATS_CUDA_AllocGPUBuffer(U32 bytesPerBuffer)

Allocates memory on the device.

This function is used to allocate memory on the device.

Parameters:

bytesPerBuffer – Total number of bytes to allocate per buffer

Returns:

This function returns a GPU buffer pointer.

RETURN_CODE ATS_CUDA_AverageRecords(void *GPUBufferIn, void *GPUBufferOut, cudaStream_t stream, U32 samplesPerRecordPerChannel, U32 recordsPerBufferIn, U32 recordsPerBufferOut, U32 channelCount, ATS_CUDA_Input_DataType inputDataType)

Launches on the GPU a kernel to average records in a buffer.

Parameters:

• GPUBufferIn – Pointer to the GPU buffer to be averaged.

• GPUBufferOut – Pointer to the averaged output GPU buffer.

• stream – Stream identifier on which processing is to take place.

• samplesPerRecordPerChannel – Samples per record per channel.

• recordsPerBufferIn – Number of records in the input GPU buffer

• recordsPerBufferOut – Desired number of records in the averaged GPU buffer

• channelCount – Number of input channels.

• inputDataType. – Data type of the input data. This parameter must receive one element of ATS_CUDA_Input_DataType.

RETURN_CODE ATS_CUDA_BaseProcessBuffer(void *GPUBufferIn, void *GPUBufferOut, cudaStream_t stream, UNPACK_DEINTERLEAVE_OPTIONS opt)

Launches on the GPU a kernel to unpack and/or deinterleave a buffer acquired with an AlazarTech digitizer.

Parameters:

• GPUBufferIn – Pointer to a GPU buffer to on which to apply unpacking/deinterleaving.

• GPUBufferOut – Pointer to a GPU buffer where data is to be outputted.

• stream – Stream identifier on which processing is to take place

• opt – Structure that defines how the unpacking and deinterleaving kernel is to be configured. See UNPACK_DEINTERLEAVE_OPTIONS.

RETURN_CODE ATS_CUDA_ConvertToVolts(void *GPUBufferIn, void *GPUBufferOut, U32 samplesPerRecord, U32 recordsPerBuffer, U32 channelCount, InputRange *Ranges, ATS_CUDA_Input_DataType inputDataType, cudaStream_t stream)

Launches on the GPU a kernel to convert raw data in float32, and optionally convert the data to volts.

Parameters:

• GPUBufferIn – Pointer to the GPU buffer of records to be converted.

• GPUBufferOut – Pointer to the GPU buffer of records in float32.

• samplesPerRecord – Samples per record.

• recordsPerBuffer – Records per buffer.

• channelCount – Number of input channels.

• Ranges – Pointer to the structure with maximum and minimum input range values in volts for each input channel. See InputRange. If nullptr is passed, just convert data to float.

• inputDataType – Data type of the input data. This parameter must receive one element of ATS_CUDA_Input_DataType.

• stream – Stream identifier on which processing is to take place.

RETURN_CODE ATS_CUDA_CopyDeviceToHost(void *GPUBuffer, void *CPUBuffer, U32 bytesPerBuffer, cudaStream_t stream)

Copies data between host and device.

Parameters:

• GPUBuffer – Pointer to the GPU source memory address

• CPUBuffer – Pointer to the CPU destination memory address

• bytesPerBuffer – Size in bytes of the buffer to copy

• stream – Stream identifier on which the copy takes place

RETURN_CODE ATS_CUDA_CopyHostToDevice(void *GPUBuffer, void *CPUBuffer, U32 bytesPerBuffer, cudaStream_t stream)

Copies data between host and device.

Parameters:

• GPUBuffer – Pointer to the GPU destination memory address

• CPUBuffer – Pointer to the CPU source memory address

• bytesPerBuffer – Size in bytes of the buffer to copy

• stream – Stream identifier on which the copy takes place

cudaStream_t ATS_CUDA_CreateStream()

Create a synchronous stream.

This function returns a pointer to the new stream identifier.

RETURN_CODE ATS_CUDA_DestroyStream(cudaStream_t stream)

Destroys and cleans up an asynchronous stream.

Parameters:

stream – Stream identifier.

RETURN_CODE ATS_CUDA_FreeCPUBuffer(void *CPUBuffer)

Frees page-locked memory.

This function is used to free host memory allocated by ATS_CUDA_AllocCPUBuffer().

Parameters:

CPUBuffer – Pointer to the memory to free

RETURN_CODE ATS_CUDA_FreeGPUBuffer(void *GPUBuffer)

Frees memory on the device.

This function is used to free GPU memory allocated by ATS_CUDA_AllocGPUBuffer().

Parameters:

GPUBuffer – Pointer to the device memory to free

RETURN_CODE ATS_CUDA_GetVersion(U8 *major, U8 *minor, U8 *revision)

Get ATS-CUDA version number.

Parameters:

• major – ATS-CUDA major version number.

• minor – ATS-CUDA minor version number.

• revision – ATS-CUDA revision number.

RETURN_CODE ATS_CUDA_GetComputeCapability(U32 deviceIndex, int *major, int *minor)

Function to get the compute capability of specified GPU.

Parameters:

• deviceIndex – 0-based index to the device.

• major – Major compute capability version number.

• minor – Minor compute capability version number.

Returns:

ApiSuccess if it succeeded.

Returns:

ApiFailed if it failed. See %TEMP%/ATS_GPU.log (/tmp/ATS_GPU.log under Linux) for more information.

RETURN_CODE ATS_CUDA_MultiplyRecords(void *GPUBufferIn, void *multiplierRecord, void *GPUBufferOut, U32 samplesPerRecord, U32 recordsPerBuffer, ATS_CUDA_Input_DataType inputDataType, cudaStream_t stream)

Launches on the GPU a kernel to multiply the records by a reference record.

Parameters:

• GPUBufferIn – Pointer to the GPU buffer of records to be multiplied.

• multiplierRecord – Pointer to the reference record multiplying the records.

• GPUBufferOut – Pointer to the multiplication result GPU buffer.

• samplesPerRecord – Samples per record.

• recordsPerBuffer – Records per buffer.

• inputDataType – Data type of the input data. This parameter must receive one element of ATS_CUDA_Input_DataType.

• stream – Stream identifier on which processing is to take place.

RETURN_CODE ATS_CUDA_QueryDeviceCount(U32 *pDeviceCount)

Function to get the number of available CUDA devices.

Parameters:

pDeviceCount – Outputs the number of devices detected on the system.

Returns:

ApiSuccess if it succeeded.

Returns:

ApiFailed if the CUDA driver returned an error.

RETURN_CODE ATS_CUDA_QueryDeviceName(U32 deviceIndex, char *deviceName, int maxChars)

Function to get the name of a specific CUDA device.

Parameters:

• deviceIndex – 0-based index to the device.

• deviceName – Char array to output the name of the device.

• maxChars – Size of the char array.

Returns:

ApiSuccess if it succeeded.

Returns:

ApiFailed if the CUDA driver returned an error.

Returns:

ApiInvalidIndex if the index provided is greater than the number of platforms or devices available.

RETURN_CODE ATS_CUDA_SetComputeDevice(U32 deviceIndex)

Allows you to specify which GPU should be used to process sample data from a digitizer, if more than one GPU is available.

Parameters:

deviceIndex – 0-based index to the device.

Returns:

ApiSuccess if it succeeded.

Returns:

ApiFailed if it failed. See %TEMP%/ATS_GPU.log (/tmp/ATS_GPU.log under Linux) for more information.

RETURN_CODE ATS_CUDA_StreamSynchronize(cudaStream_t stream)

Waits for a stream to complete.

This function blocks the host thread until stream has completed all operations.

Parameters:

stream – Stream identifier.

bool ATS_CUDA_StreamQuery(cudaStream_t stream)

Queries a synchronous stream for completion status.

This function blocks the host thread until stream has completed all operations.

Parameters:

stream – Stream identifier.

Returns:

This function returns 1 if all operations in stream have completed.

Returns:

This function returns 0 if not.

RETURN_CODE ATS_CUDA_SeparateDataFromNPTFooters(void *GPUBufferIn, void *GPUDataOut, U32 numberOfRecords, U32 bytesPerFooterBlock, U32 footerBlockStrideBytes, cudaStream_t stream)

Launches on the GPU a kernel to extract the digitized data from buffers containing NPT footers.

Parameters:

• GPUBufferIn – Pointer to a GPU buffer of raw data acquired with an ATS board containing NPT footers.

• GPUDataOut – Pointer to a GPU buffer where the raw data is to be extracted.

• numberOfRecords – Number of records in GPUBufferIn.

• bytesPerFooterBlock – Number of bytes per NPT footer block.

• footerBlockStrideBytes – Distance in bytes between two consecutive NPT footer blocks.

• stream – Stream identifier on which processing is to take place.

RETURN_CODE ATS_CUDA_ExtractNPTFooters(void *GPUBufferIn, void *GPUFooters, U32 numberOfRecords, U32 bytesPerFooterBlock, U32 footerBlockStrideBytes, cudaStream_t stream)

Launches on the GPU a kernel to extract NPT footers from buffers containing NPT footers.

Parameters:

• GPUBufferIn – Pointer to a GPU buffer of raw data acquired with an ATS board containing NPT footers.

• GPUFooters – Pointer to a GPU buffer where the NPT footers are to be extracted.

• numberOfRecords – Number of records in GPUBufferIn.

• bytesPerFooterBlock – Number of bytes per NPT footer block.

• footerBlockStrideBytes – Distance in bytes between two consecutive NPT footer blocks.

• stream – Stream identifier on which processing is to take place.