I tried some codes by googling :
clock_t start, end; start = clock(); //CODES GOES HERE end = clock(); std::cout << end - start <<"\n"; std::cout << (double) (end-start)/ CLOCKS_PER_SEC; but the result elapsed time always was 0, even with
std::cout << (double) (end-start)/ (CLOCKS_PER_SEC/1000.0 ); Don't know why but when I get the similar in Java : getCurrentTimeMillis() it works well. I want it to show the milliseconds as maybe the computer compute so fast.
I don't think it's guaranteed that clock has a high enough resolution to profile your function. If you want to know how fast a function executes, you should run it maybe a few thousands times instead of once, measure the total time it takes and take the average.
#include <boost/progress.hpp> int main() { boost::progress_timer timer; // code to time goes here } This will print out the time it took to run main. You can place your code in scopes to time several parts, i.e. { boost::progress_timer timer; ... }.
sudo apt-get install boost-dev or something similar.This question is somehow similar to yours: Timing a function in a C++ program that runs on Linux
Take a look at this answer!
