CUDA中记录GPU耗时与C编程中记录CPU耗时的方法

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// capture the start time

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

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// get stop time, and display the timing results

cudaEventRecord( stop, 0 );
cudaEventSynchronize( stop );
float   elapsedTime;
cudaEventElapsedTime( &elapsedTime,
start, stop );
printf( "Time to generate:  %3.1f ms\n", elapsedTime );

cudaEventDestroy( start );
cudaEventDestroy( stop );

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//Compile_Environment:Microsoft Visual C++2010

#include stdio.h
#include Windows.h   //该头文件不能少，且需在Winbase.h前
#include  Winbase.h   //该头文件不能少

void main()
{

     LARGE_INTEGER   litmp;  
     LONGLONG   QPart1,QPart2;  
     double   dfMinus,   dfFreq,   dfTim;  
     QueryPerformanceFrequency(&litmp);                        //获得计数器的时钟频率  

     dfFreq   =   (double)litmp.QuadPart;  
     QueryPerformanceCounter(&litmp);                               //获得初始值

     QPart1   =   litmp.QuadPart;

     QueryPerformanceCounter(&litmp);                        //获得终止值  

     QPart2   =   litmp.QuadPart;
     dfMinus   =   (double)(QPart2-QPart1);
     dfTim   =   dfMinus   /   dfFreq;

     printf( "Time to run this program is %f CPU_Clock\n",dfMinus);
     printf( "Time to run this program is %f seconds\n",dfTim);
}