计算算法的运行时间，精确到us（c、window、vs2019）

#include<stdio.h>#include <windows.h>#include <iostream>#include <thread>#include<ctime>//计时部分初始化double run_time;_LARGE_INTEGER time_start;//开始时间_LARGE_INTEGER time_over;

agentky

663人浏览 · 2022-02-23 18:51:11

agentky · 2022-02-23 18:51:11 发布

#include<stdio.h>
#include <windows.h>
#include <iostream>
#include <thread>
#include<ctime>
//计时部分初始化
double run_time;
_LARGE_INTEGER time_start;  //开始时间
_LARGE_INTEGER time_over;   //结束时间
double dqFreq;      //计时器频率
LARGE_INTEGER f;    //计时器频率
QueryPerformanceFrequency(&f);
dqFreq = (double)f.QuadPart;

//计算耗时
QueryPerformanceCounter(&time_start);   //计时开始
//计算一函数的运行时间

QueryPerformanceCounter(&time_over);    //计时结束
run_time = 1000000 * (time_over.QuadPart - time_start.QuadPart) / dqFreq;
//乘以1000000把单位由秒化为微秒，精度为1000 000/（cpu主频）微秒
printf("\nrun_time：%fus\n", run_time);