计时器的time_t和clock_t 的两种实现方法(推荐)

Z时代
2024-01-10
分类：综合

想给自己初步完成的相空间搜索算法计算一下运行时间，于是尝试了如下使用 time_t 类型的方式


#include <stdlib.h>
#include <iostream>
#include <time.h>
#include "StateFunctions.h"
using namespace std;
int main(int argc, char** argv)
{
  time_t start, finish;
  time(&start);
  StateFunctions testobj(22, 22);
  testobj.TEST();
  testobj.TEST();
  testobj.FillRandomDets(200);
  testobj.evolute(1000, 0.9);
  cout << "--------------------------------------------" << endl;
  time(&finish);
  double duration = difftime(finish, start);
  cout << "--> time: " << duration << " s" << endl;
  cout << "--------------------------------------------" << endl;
  return 0;
}

这种实现方式可以正确计算出算法的核心部分耗费了234秒的 walltime。在此之前尝试的使用 clock_t 类型的实现方式是


#include <iostream>
#include <time.h>
#include "StateFunctions.h"
using namespace std;
int main(int argc, char** argv)
{
	clock_t start, finish;
	start = clock();
	StateFunctions testobj(22, 22);
	testobj.TEST();
	testobj.TEST();
	testobj.FillRandomDets(200);
	testobj.evolute(1000, 0.9);
	cout << "--------------------------------------------" << endl;
	finish = clock();
	double duration = (double)(finish - start) / CLOCKS_PER_SEC;
	cout << "--> time: " << duration << " s" << endl;
	cout << "--------------------------------------------" << endl;
	return 0;
}