Qt测试计算时间

#include <QDebug>  
#include <QTime>  
  
QTime time;  
  
time.start();  
function();  
  
qDebug()<<time.elapsed()/1000.0<<"s";  

#include <QDebug>  
#include <sys/time.h>  
  
double time_Start = (double)clock();  
function();  
double time_End = (double)clock();  
      
qDebug()<<(time_End - time_Start)/1000.0<<"s";  

#include <QDebug>  
#include <windows.h>  
  
LARGE_INTEGER litmp;  
LONGLONG Qpart1,Qpart2,Useingtime;  
double dfMinus,dfFreq,dfTime;  
  
//获得CPU计时器的时钟频率  
QueryPerformanceFrequency(&litmp);//取得高精度运行计数器的频率f,单位是每秒多少次（n/s），  
dfFreq = (double)litmp.QuadPart;  
  
QueryPerformanceCounter(&litmp);//取得高精度运行计数器的数值  
Qpart1 = litmp.QuadPart; //开始计时  
  
function(); //待测试的计算函数等  
  
QueryPerformanceCounter(&litmp);//取得高精度运行计数器的数值  
Qpart2 = litmp.QuadPart; //终止计时  
  
dfMinus = (double)(Qpart2 - Qpart1);//计算计数器值  
dfTime = dfMinus / dfFreq;//获得对应时间，单位为秒,可以乘1000000精确到微秒级（us）  
Useingtime = dfTime*1000000;  
  
qDebug()<<dfTime<<"s";  

#include <QDebug>  
#include <sys/time.h>  
  
struct timeval tpstart,tpend;  
float timeuse;  
  
gettimeofday(&tpstart,NULL);  
function();  
gettimeofday(&tpend,NULL);  
timeuse=(1000000*(tpend.tv_sec-tpstart.tv_sec) + tpend.tv_usec-tpstart.tv_usec)/1000000.0;  
  
qDebug()<<timeuse<<"s";