timers_cuda.hpp

/*
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 *  Author: Anatoly Baskeheev, Itseez Ltd, (myname.mysurname@mycompany.com)
 */
 
#ifndef _PCL_CUDA_TIMERS_HPP_
#define _PCL_CUDA_TIMERS_HPP_
 
#include <cuda_runtime_api.h>
#include <cstdio>
 
namespace pcl
{
    namespace gpu
    {
        struct Timer
        {
            cudaEvent_t start_, stop_;
            Timer(bool runTimer = false) 
            { 
                cudaEventCreate(&start_); 
                cudaEventCreate(&stop_);  
                if (runTimer)
                    start();
            }
            ~Timer() 
            { 
                cudaEventDestroy(start_);  
                cudaEventDestroy(stop_);
            }
 
            void start() const { cudaEventRecord(start_, 0); }
            Timer& stop()  { cudaEventRecord(stop_, 0); cudaEventSynchronize(stop_); return *this; }
 
            float time() const
            {
                float elapsed_time; 
                cudaEventElapsedTime(&elapsed_time, start_, stop_);
                return elapsed_time;
            }
        };
 
        struct ScopeTimer
        {
            const char* name;
            cudaEvent_t start, stop;
            ScopeTimer(const char* name_) : name(name_)
            {
                cudaEventCreate(&start); 
                cudaEventCreate(&stop);  
                cudaEventRecord(start);
            }
            ~ScopeTimer()
            {
                float elapsed_time; 
                cudaEventRecord(stop);  
                cudaEventSynchronize(stop);
                cudaEventElapsedTime(&elapsed_time, start, stop);
                printf("Time(%s) = %fms\n", name, elapsed_time);        
                cudaEventDestroy(start);  
                cudaEventDestroy(stop);
            }
        };
    }
}
 
#endif /* _PCL_CUDA_TIMERS_HPP_ */