Re: [boost] Re: Profiling Library suggestion

From: christopher diggins (cdiggins_at_[hidden])
Date: 2005-02-04 15:21:02

----- Original Message ----- 
From: "Gennadiy Rozental" <gennadiy.rozental_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Friday, February 04, 2005 2:17 PM
Subject: [boost] Re: Profiling Library suggestion

> How is it better than what boost::timer provide?
>
> Gennadiy

Hello,

I was unaware of timer's existance, thanks for pointing it out. I had 
searched for "profiling", and "profiler".

So I just took a look at: http://www.boost.org/libs/timer/timer.htm and I 
would humbly submit that perhaps what is lacking in progress_timer is a 
policy, and the ability to name profiles. I would like then to propose:

  struct profiler_default_policy {
    typedef boost::timer timer_t;
    static void on_profiled(const char* name, const timer_t& t) {
      double sec = t.elapsed();
      cout << "time elapsed (msec) during profile " << name << " was " << 
sec / 1000;
      if (sec <= t.elapsed_min()) {
        cout << " *underflow* ";
      }
      if (sec >= t.elapsed_max())
        cout << " *overflow* ";
      }
      cout << endl;
    }
  };

  struct interesting_profiler_policy {
    typedef boost::timer timer_t;
    static map<string, double> profiles;
    static void on_profiled(const char* name, const timer_t& t) {
      double sec = t.elapsed();
      profiles[name] = sec;
    }
  };

  template<typename policy_t>
  class basic_profiler {
    public:
      profiler(char const* s = "") : name(s) { };
      ~profiler() { policy_t::on_profiled(name, timer); };
    private:
      char const* name;
      typename policy_t::timer_t timer;
  };

  typedef basic_profiler<default_profiler_policy> profiler;

This would have an advantage over progress_timer that library users may 
modify the behaviour of the profiler, without rewriting the class. It can 
also be used with more high-performance timers if the user has one at their 
disposal.

Any comments or suggestions?

Christopher Diggins
Object Oriented Template Library (OOTL)
http://www.ootl.org