Class perf_timer

compute/perf/perf.hpp:49–97

a simple timer wrapper which records multiple time entries

// a simple timer wrapper which records multiple time entries
class perf_timer
{
public:
    typedef boost::timer::nanosecond_type nanosecond_type;

    perf_timer()
    {
        timer.stop();
    }

    void start()
    {
        timer.start();
    }

    void stop()
    {
        timer.stop();
        times.push_back(timer.elapsed().wall);
    }

    size_t trials() const
    {
        return times.size();
    }

    void clear()
    {
        times.clear();
    }

    nanosecond_type last_time() const
    {
        return times.back();
    }

    nanosecond_type min_time() const
    {
        return *std::min_element(times.begin(), times.end());
    }

    nanosecond_type max_time() const
    {
        return *std::max_element(times.begin(), times.end());
    }

    boost::timer::cpu_timer timer;
    std::vector<boost::timer::nanosecond_type> times;
};

// returns the rate (in MB/s) for processing 'count' items of type 'T'
// in 'time' nanoseconds