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- resolution of std::chrono::high_resolution_clock doesn't correspond to measurements 3 answers
I know there are many topics for finding elapse time of a code and I have read many, but i really get confused I decided to use high resolution clock and ran this code to see how many times a second the clock ticks
cout << chrono::high_resolution_clock::period::den << endl;
output:10000000
and then I defined the begin time and the end time as below
int main()
{
auto begin = std::chrono::high_resolution_clock::now();
.
.
.
.
auto end = std::chrono::high_resolution_clock::now();
cout<<"RUN TIME IS :"<<endl;
std::cout << std::chrono:: duration_cast <chrono:: nanoseconds>(end-begin).count() << "ns" << std::endl;
system("PAUSE");
//**********************************************************
return 0;
}
but most of the time the output is 0, but the code is more than 2000lines I waste a lot of time,but the problem has not solved yet . So please let me know is it a good way to determine the elapse time ? And what is the wrong with my code ? I am using VS2012 another question is that i want to measure a computation time of a problem and I am not sure which one should i measure(system time , user time or real time) ? Thank you in advance
