How to check time performances in a C++ program on Zedboard

Question

I have implemented a C++ code on a Zedboard. It compiles and runs perfectly, but now i would like to check the performances in order to optimize some functions. I have chec

Answer 1

You can create a simple timer class using the header. Something like this:

class Timer
{
public:
    using clock = std::chrono::steady_clock;

    void clear() { start(); tse = tsb; }
    void start() { tsb = clock::now(); }
    void stop()  { tse = clock::now(); }

    auto nsecs() const
    {
        using namespace std::chrono;
        return duration_cast(tse - tsb).count();
    }

    double usecs() const { return double(nsecs()) / 1000.0; }
    double msecs() const { return double(nsecs()) / 1000000.0; }
    double  secs() const { return double(nsecs()) / 1000000000.0; }

    friend std::ostream& operator<<(std::ostream& o, Timer const& timer)
    {
        return o << timer.secs();
    }

private:
    clock::time_point tsb;
    clock::time_point tse;
};

You can use it simply like this:

Timer timer;

timer.start();

// do some stuff
std::this_thread::sleep_for(std::chrono::milliseconds(600));

timer.stop();

std::cout << timer << " seconds" << '\n';

EDIT: On POSIX systems you can use clock_gettime() if is not available:

class Timer
{
public:
    void clear() { start(); tse = tsb; }
    void start() { clock_gettime(CLOCK_MONOTONIC, &tsb); }
    void stop() { clock_gettime(CLOCK_MONOTONIC, &tse); }

    long nsecs() const
    {
        long b = (tsb.tv_sec * 1000000000) + tsb.tv_nsec;
        long e = (tse.tv_sec * 1000000000) + tse.tv_nsec;
        return e - b;
    }

    double usecs() const { return double(nsecs()) / 1000.0; }
    double msecs() const { return double(nsecs()) / 1000000.0; }
    double  secs() const { return double(nsecs()) / 1000000000.0; }

    friend std::ostream& operator<<(std::ostream& o, Timer const& timer)
    {
        return o << timer.secs();
    }

private:
    timespec tsb;
    timespec tse;
};