cuda_timer.cu

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/*
 *  SPDX-FileCopyrightText: Copyright 2021, Siavash Ameli <sameli@berkeley.edu>
 *  SPDX-License-Identifier: BSD-3-Clause
 *  SPDX-FileType: SOURCE
 *
 *  This program is free software: you can redistribute it and/or modify it
 *  under the terms of the license found in the LICENSE.txt file in the root
 *  directory of this source tree.
 */
 
 
// =======
// Headers
// =======
 
#include "./cuda_timer.h"
 
 
// ===========
// Constructor
// ===========
 
 
CudaTimer::CudaTimer()
{
    cudaEventCreate(&this->start_time);
    cudaEventCreate(&this->stop_time);
}
 
 
// ==========
// Destructor
// ==========
 
 
CudaTimer::~CudaTimer()
{
    cudaEventDestroy(this->start_time);
    cudaEventDestroy(this->stop_time);
}
 
 
// =====
// start
// =====
 
 
void CudaTimer::start()
{
    cudaEventRecord(this->start_time, 0);
}
 
 
// ====
// stop
// ====
 
 
void CudaTimer::stop()
{
    cudaEventRecord(this->stop_time, 0);
}
 
 
// =======
// elapsed
// =======
 
 
float CudaTimer::elapsed() const
{
    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;
}