用于获取以毫秒为单位的经过时间的定义函数 [英] Definitive function for get elapsed time in miliseconds
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问题描述
我尝试过 clock_gettime(CLOCK_REALTIME)
和 gettimeofday()
c $ c> clock(),什么返回0给我(?)。
I have tried clock_gettime(CLOCK_REALTIME)
and gettimeofday()
without luck - And the most basic like clock()
, what return 0 to me (?).
我不需要一个高分辨率的定时器,但我需要一些东西来获得经过的时间以毫秒为单位。
But none of they count the time under sleep. I don't need a high resolution timer, but I need something for getting the elapsed time in ms.
编辑:最终节目:
#include <iostream>
#include <string>
#include <time.h>
#include <sys/time.h>
#include <sys/resource.h>
using namespace std;
// Non-system sleep (wasting cpu)
void wait ( int seconds )
{
clock_t endwait;
endwait = clock () + seconds * CLOCKS_PER_SEC ;
while (clock() < endwait) {}
}
int show_time() {
timeval tv;
gettimeofday(&tv, 0);
time_t t = tv.tv_sec;
long sub_sec = tv.tv_usec;
cout<<"t value: "<<t<<endl;
cout<<"sub_sec value: "<<sub_sec<<endl;
}
int main() {
cout<<show_time()<<endl;
sleep(2);
cout<<show_time()<<endl;
wait(2);
cout<<show_time()<<endl;
}
推荐答案
c $ c> gettimeofday(),它肯定会计算挂钟时间,所以它会计算进程休眠的时间。
You need to try gettimeofday()
again, it certainly count the wall clock time, so it counts when the process sleep as well.
long long getmsofday()
{
struct timeval tv;
gettimeofday(&tv);
return (long long)tv.tv_sec*1000 + tv.tv_usec/1000;
}
...
long long start = getmsofday();
do_something();
long long end = getmsofday();
printf("do_something took %lld ms\n",end - start);
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