CudaTimer Class Reference

Records elasped time between two CUDA events. More...

#include <cuda_timer.h>

Public Member Functions
	CudaTimer ()
	constructor for CudaTimer More...
	~CudaTimer ()
	Destructor for CudaTimer. More...
void	start ()
	Starts the timer. More...
void	stop ()
	Stops the timer. More...
float	elapsed () const
	Returns the elapsed time in seconds. More...

Protected Attributes
cudaEvent_t	start_time
cudaEvent_t	stop_time

Detailed Description

Records elasped time between two CUDA events.

The measured time is the wall time, not the process time of the GPU. In fact, the measured time the same as the wall clock time of CPU.

Example:

It is better to synchronize all GPU threads before reading the time. For instance:

CudaTimer cuda_timer;
cuda_timer.start();

// Some GPU threads here.
// ...

// Note, this CudaTime measures wall time, so the sleep()
// time counts toward the measured time.
sleep(1);

// Sync threads so the CPU do not jump to the next before
// gpu threads are done.
cudaDeviceSynchronize();

cuda_timer.stop();
float elapsed_time = cuda_timer.elapsed();

See also

Timer

Definition at line 61 of file cuda_timer.h.

Constructor & Destructor Documentation

CudaTimer()

CudaTimer::CudaTimer

(

)

constructor for CudaTimer

Definition at line 26 of file cuda_timer.cu.

{
    cudaEventCreate(&this->start_time);
    cudaEventCreate(&this->stop_time);
}

References cudaEventCreate(), start_time, and stop_time.

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~CudaTimer()

CudaTimer::~CudaTimer

(

)

Destructor for CudaTimer.

Definition at line 40 of file cuda_timer.cu.

{
    cudaEventDestroy(this->start_time);
    cudaEventDestroy(this->stop_time);
}

References cudaEventDestroy(), start_time, and stop_time.

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Member Function Documentation

elapsed()

float CudaTimer::elapsed

(

)

const

Returns the elapsed time in seconds.

Definition at line 80 of file cuda_timer.cu.

{
    float elapsed_time;
    cudaEventSynchronize(this->stop_time);
    cudaEventElapsedTime(&elapsed_time, this->start_time, this->stop_time);
 
    // Convert from milli-second to second
    return elapsed_time / 1.0e+3;
}

References cudaEventElapsedTime(), cudaEventSynchronize(), start_time, and stop_time.

Referenced by cuTraceEstimator< DataType >::cu_trace_estimator().

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start()

void CudaTimer::start

(

)

Starts the timer.

Definition at line 54 of file cuda_timer.cu.

{
    cudaEventRecord(this->start_time, 0);
}

References cudaEventRecord(), and start_time.

Referenced by cuTraceEstimator< DataType >::cu_trace_estimator().

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stop()

void CudaTimer::stop

(

)

Stops the timer.

Definition at line 67 of file cuda_timer.cu.

{
    cudaEventRecord(this->stop_time, 0);
}

References cudaEventRecord(), and stop_time.

Referenced by cuTraceEstimator< DataType >::cu_trace_estimator().

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Member Data Documentation

start_time

cudaEvent_t CudaTimer::start_time

protected

Definition at line 72 of file cuda_timer.h.

Referenced by CudaTimer(), elapsed(), start(), and ~CudaTimer().

stop_time

cudaEvent_t CudaTimer::stop_time

protected

Definition at line 73 of file cuda_timer.h.

Referenced by CudaTimer(), elapsed(), stop(), and ~CudaTimer().

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The documentation for this class was generated from the following files:

• /home/runner/work/imate/imate/imate/_cuda_utilities/cuda_timer.h
• /home/runner/work/imate/imate/imate/_cuda_utilities/cuda_timer.cu