timer.h

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/*
 * nvbio
 * Copyright (c) 2011-2014, NVIDIA CORPORATION. All rights reserved.
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 * modification, are permitted provided that the following conditions are met:
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
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 *      names of its contributors may be used to endorse or promote products
 *      derived from this software without specific prior written permission.
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 */

#pragma once

#include <nvbio/basic/types.h>
#include <cuda_runtime.h>

namespace nvbio {
namespace cuda {

struct Timer
{
    inline Timer();

    inline ~Timer();

        inline void start();

        inline void stop();

        inline float seconds() const;

    cudaEvent_t m_start, m_stop;
};

template <typename T>
struct ScopedTimer
{
         ScopedTimer(T* time) : m_time( time ), m_timer() { m_timer.start(); }
        ~ScopedTimer() { m_timer.stop(); *m_time += m_timer.seconds(); }

        T*              m_time;
        Timer   m_timer;
};

// constructor
//
Timer::Timer()
{
    cudaEventCreate(&m_start);
    cudaEventCreate(&m_stop);
}

// destructor
//
Timer::~Timer()
{
    cudaEventDestroy(m_start);
    cudaEventDestroy(m_stop);
}

// start timing
//
void Timer::start()
{
    cudaEventRecord(m_start, 0);
}

// stop timing
//
void Timer::stop()
{
    cudaEventRecord(m_stop, 0);
    cudaEventSynchronize(m_stop);
}

// elapsed seconds
//
float Timer::seconds() const
{
    float elapsedTime;
    cudaEventElapsedTime(&elapsedTime, m_start, m_stop);
    return elapsedTime * 1.0e-3f;
}

} // namespace cuda
} // namespace nvbio