C++ cudaEventCreate函数代码示例

cudaTimer::cudaTimer(){

	cudaError_t status;
	status = cudaEventCreate(&inicio);
	status = cudaEventCreate(&fin);

}

  double time_invocation_cuda(std::size_t num_trials, Function f, Arg1 arg1, Arg2 arg2, Arg3 arg3)
{
  cudaEvent_t start, stop;
  cudaEventCreate(&start);
  cudaEventCreate(&stop);

  cudaEventRecord(start);
  for(std::size_t i = 0;
      i < num_trials;
      ++i)
  {
    f(arg1,arg2,arg3);
  }
  cudaEventRecord(stop);
  cudaThreadSynchronize();

  float msecs = 0;
  cudaEventElapsedTime(&msecs, start, stop);

  cudaEventDestroy(start);
  cudaEventDestroy(stop);

  // return mean msecs
  return msecs / num_trials;
}

float bench::ClockBenchmark::_determineCycleTime() {
	cudaEvent_t start, end;
	
	check( cudaEventCreate(&start) );
	check( cudaEventCreate(&end) );
	
	unsigned long long elapsedCycles;
	unsigned long long* deviceElapsedCycles;
	long long int* deviceDummyMem;
	const dim3 grid(1,1,1), block(1,1,1);
	
	check( cudaMalloc((void**)&deviceElapsedCycles, sizeof(unsigned long long)) );
	check( cudaMalloc((void**)&deviceDummyMem, sizeof(long long int)) );
	
	check( cudaEventRecord(start) );
	cudaDetermineCycleTimeWrapper(deviceElapsedCycles, deviceDummyMem, grid, block);
	check( cudaEventRecord(end) );
	
	check( cudaDeviceSynchronize() );
	
	check( cudaMemcpy(&elapsedCycles, deviceElapsedCycles, sizeof(unsigned long long), cudaMemcpyDeviceToHost) );
	
	float elapsedTime = 0;
	check( cudaEventElapsedTime(&elapsedTime, start, end) );
	
	report(util::Indents(2) << "elapsed time: " << elapsedTime << "ms");
	report(util::Indents(2) << "elapsed cycles: " << elapsedCycles);
	
	return elapsedTime * 1000000.0 / (float)elapsedCycles;
}

int main()
{
	cudaEvent_t start;
	cudaEvent_t end;
	float duration;

	const float overestimateRate = 0.01f;
	const float errorRate = 0.01f;
	Tokenizer tokenizer( overestimateRate, errorRate );

	/************** Test counting string tokens *************/
	TextReader reader;

	cudaEventCreate( &start );
	cudaEventRecord( start, 0 );

	reader.Read();
	tokenizer.StartTokenizing( 
		reader.GetCharBuffer(), 
		reader.GetOffsetBuffer(), 
		reader.GetCharBufferSize(), 
		reader.GetOffsetBufferSize() );
	
	cudaEventCreate( &end );
	cudaEventRecord( end, 0 );
	cudaEventSynchronize( end );

	cudaEventElapsedTime( &duration, start, end );
	printf( "Time taken: %.3lf milliseconds\n", duration );

	tokenizer.GetFrequency( "a" );
}

void trainMethodsSpeedTestGPU(fann *ann, fann_train_data* train, unsigned int trainingAlgorithm, unsigned int epochCount)
{
    fann *gpunn = fann_copy(ann);
    gpunn->training_algorithm = (fann_train_enum)trainingAlgorithm;

    {
        cudaEvent_t start, stop;
        float time;

        cudaEventCreate(&start);
        cudaEventCreate(&stop);
        cudaEventRecord(start, 0);

        gpuann_fann_parallel_train_on_data(gpunn, train, epochCount);

        cudaEventRecord(stop, 0);
        cudaEventSynchronize(stop);
        cudaEventElapsedTime(&time, start, stop);
        cudaEventDestroy(start);
        cudaEventDestroy(stop);

        printf("%10.5f ", time);
    }

    fann_destroy(gpunn);
}

unsigned int StartTimer () {
  cudaEventCreate(&timerStart);
  cudaEventCreate(&timerStop);

  cudaEventRecord(timerStart,0);
  return 0;
}

void runCuda()
{
	//////////////////////
	// Timing cuda call //
	//////////////////////
	float time;
	cudaEvent_t start, stop;
	cudaEventCreate(&start);
	cudaEventCreate(&stop);
	cudaEventRecord(start, 0);

	// Map OpenGL buffer object for writing from CUDA on a single GPU
	// No data is moved (Win & Linux). When mapped to CUDA, OpenGL should not use this buffer
	dptr=NULL;

	vbo = mesh->getVBO();
	vbosize = mesh->getVBOsize();

	nbo = mesh->getNBO();
	nbosize = mesh->getNBOsize();

#if RGBONLY == 1
	float newcbo[] = {0.0, 1.0, 0.0, 
					0.0, 0.0, 1.0, 
					1.0, 0.0, 0.0};
	cbo = newcbo;
	cbosize = 9;
#elif RGBONLY == 0
	vec3 defaultColor(0.5f, 0.5f, 0.5f);
	mesh->changeColor(defaultColor);
	cbo = mesh->getCBO();
	cbosize = mesh->getCBOsize();
#endif

	ibo = mesh->getIBO();
	ibosize = mesh->getIBOsize();

	cudaGLMapBufferObject((void**)&dptr, pbo);

	updateCamera();

	cudaRasterizeCore(cam, dptr, glm::vec2(width, height), frame, vbo, vbosize, cbo, cbosize, ibo, ibosize, nbo, nbosize, lights, lightsize, alpha, beta, displayMode);
	cudaGLUnmapBufferObject(pbo);

	vbo = NULL;
	cbo = NULL;
	ibo = NULL;

	frame++;
	fpstracker++;

	//////////////////////
	// Timing cuda call //
	//////////////////////
	cudaEventRecord(stop, 0);
	cudaEventSynchronize(stop);
	cudaEventElapsedTime(&time, start, stop);
	printf("runCuda runtime: %3.1f ms \n", time);
}

CudaTimer::CudaTimer(cudaStream_t stream)
	: start(nullptr)
	, end(nullptr)
	, stream(stream)
{
	CUDA_CHECK(cudaEventCreate(&start));
	CUDA_CHECK(cudaEventCreate(&end));
}

		CUDATimer() {
			start_ = 0.0; stop_ = 0.0; elapsed_ = 0.0; is_running_ = false;
			cudaEventCreate(&custart_);
			cudaEventCreate(&custop_);
			cudaEventCreate(&cubase_);

			cudaEventRecord(cubase_);
		} // CUDATimer()

void contractTT(sTensorGPU *TT1, sTensorGPU *TT2, const int n, const int size)
{
	cublasHandle_t handle;
	cublasCreate(&handle);
	type result=0;

	sTensorGPU temp1 = emptyTensor(size*size,2);
	sTensorGPU temp2 = emptyTensor(size*size*2,3);
	cudaEvent_t start;
	cudaEventCreate(&start);
	cudaEvent_t stop;
	cudaEventCreate(&stop);

	//printf("Start contractTT\n");

	cudaEventRecord(start, NULL);
	int indA = TT1[0].size[0];
	int indB = TT2[0].size[0];

	sTensorCPU tt1start = copyToCPU(TT1[0]);
	sTensorCPU tt2start = copyToCPU(TT2[0]);
	sTensorCPU tt1end = copyToCPU(TT1[n - 1]);
	sTensorCPU tt2end = copyToCPU( TT2[n - 1]);


	for (int i = 0; i < indA; i++){
		TT1[0] = prepareTensorStart(tt1start, i);
		TT1[n - 1] = prepareTensorEnd(tt1end, i);
		for (int j = 0; j < indB; j++){
			TT2[0] = prepareTensorStart(tt2start, j);
			TT2[n - 1] = prepareTensorEnd(tt2end, j);
			contractTensor(handle, TT1[0], TT2[0], temp1);
			for (int i = 1; i < n; i++){
				contractTensor(handle, temp1, TT1[i], temp2);
				contractTensor(handle, temp2, TT2[i], temp1, 2);
			}
			type add = 0;
			cudaMemcpy(&add, temp1.deviceData, sizeof(type), cudaMemcpyDeviceToHost);
			//printf("%e ", add);
			result += add;
		}
	}
	cudaEventRecord(stop, NULL);
	cudaEventSynchronize(stop);
	
	float msecTotal = 0.0f;
	cudaEventElapsedTime(&msecTotal, start, stop);
	printf("Time: %.3fms\n", msecTotal);
	printf("Ops: %.0f\n", bops);
	double gigaFlops = (bops * 1.0e-9f) / (msecTotal / 1000.0f);
	printf("Perf= %.2f GFlop/s\n", gigaFlops);

	cublasDestroy(handle);
	cudaDeviceReset();

	printf("%.5e \n", result);
	exit(0);
}

void Timer::Init() {
  if (!initted()) {
    if (Caffe::mode() == Caffe::GPU) {
      CUDA_CHECK(cudaEventCreate(&start_gpu_));
      CUDA_CHECK(cudaEventCreate(&stop_gpu_));
    }
    initted_ = true;
  }
}

// startTest ------------------------------------------------------------------
//		Initializes the cuda timer events and starts the timer.
//		@param start - Start time evet
//		@param end   - End time evet
//-----------------------------------------------------------------------------
void startTest(cudaEvent_t &start, cudaEvent_t &stop, char* msg){
	// Create Events
	cudaEventCreate( &start );
	cudaEventCreate( &stop );
	
	// Start Timer
	printf("%s\n", msg);
	cudaEventRecord( start, 0 );
}

void sobel1(int *h_result, unsigned int *h_pic, int xsize, int ysize, int thresh)
{

	
	int *d_result;
	unsigned int *d_pic;
	
	 
	int resultSize = xsize * ysize  * 3 * sizeof(int);
	int picSize = xsize * ysize * sizeof(int);

	 
	cudaMalloc( (void**)&d_result, resultSize);
	if( !d_result) {
		exit(-1);
	}
	cudaMalloc( (void**)&d_pic, picSize);
	if( !d_pic) {
		exit(-1);
	}

	 
	cudaMemcpy(d_result, h_result, resultSize, cudaMemcpyHostToDevice);
	cudaMemcpy(d_pic, h_pic, picSize, cudaMemcpyHostToDevice);
	
	 
	
	dim3 threadsPerBlock(BLOCKSIZE, BLOCKSIZE);
	dim3 numBlocks(ceil((float)ysize/(float)threadsPerBlock.x), ceil((float)xsize/(float)threadsPerBlock.y));
	
	 
	cudaEvent_t start, stop;
	cudaEventCreate(&start);
	cudaEventCreate(&stop);
{	__set_CUDAConfig(numBlocks, threadsPerBlock ); 
          
	d_sobel1 (d_result, d_pic, xsize, ysize, thresh);}
          
	
	 
	cudaEventSynchronize(stop);
	float elapsedTime;
	cudaEventElapsedTime(&elapsedTime, start, stop);
	cudaEventDestroy(start);
	cudaEventDestroy(stop);

	 
	 
	cudaMemcpy(h_result, d_result, resultSize, cudaMemcpyDeviceToHost);
	cudaMemcpy(h_pic, d_pic, picSize, cudaMemcpyDeviceToHost);

	 
	cudaFree(d_result);
	cudaFree(d_pic);
	
}

void startTimer_GPU( MTime* mtime )
{
  mtime->type = GPU_TIME;
  if(mtime->gpustart==0 || mtime->gpustop==0)
  {
    CHECK_ERROR(cudaEventCreate(&mtime->gpustart));
    CHECK_ERROR(cudaEventCreate(&mtime->gpustop));
  }
  CHECK_ERROR( cudaEventRecord(mtime->gpustart) );
}

CCudaTimeMeasure::CCudaTimeMeasure(cudaStream_t csStreamID/* = 0*/):
	m_ceStartEvent(NULL),
	m_ceStopEvent(NULL),
	m_csStreamID(csStreamID)
{
	cudaCheckError(cudaEventCreate(&m_ceStartEvent));
	cudaCheckError(cudaEventCreate(&m_ceStopEvent));

	cudaCheckError(cudaEventRecord(m_ceStartEvent, m_csStreamID));
}