execution_time_predictor.h

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// -*- mode: c++; tab-width: 4; indent-tabs-mode: t; eval: (progn (c-set-style "stroustrup") (c-set-offset 'innamespace 0)); -*-
// vi:set ts=4 sts=4 sw=4 noet :
// Copyright 2008, The TPIE development team
// 
// This file is part of TPIE.
// 
// TPIE is free software: you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License as published by the
// Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
// 
// TPIE is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
// License for more details.
// 
// You should have received a copy of the GNU Lesser General Public License
// along with TPIE.  If not, see <http://www.gnu.org/licenses/>
#include <tpie/portability.h>

#include <boost/date_time/posix_time/posix_time.hpp>
#include <sstream>
#include <tpie/util.h>
#include <tpie/prime.h>
#ifndef __TPIE_EXECUTION_TIME_PREDICTOR_H__
#define __TPIE_EXECUTION_TIME_PREDICTOR_H__


namespace tpie {

typedef uint64_t time_type;

void init_execution_time_db();

void finish_execution_time_db();

class unique_id_type {
public:
    inline unique_id_type & operator << (const std::type_info & type) {
        ss << type.name() << ";"; return *this;
    }
    
    template <typename T>
    inline unique_id_type & operator<<(const T & x) {
        ss << typeid(T).name() << ":" << x << ";"; return *this;
    }
    
    inline std::string operator()() {return ss.str();}
private:
    std::stringstream ss;
};


class execution_time_predictor {
public:
    execution_time_predictor(const std::string & id=std::string());
    ~execution_time_predictor();
    time_type estimate_execution_time(stream_size_type n, double & confidence);
    void start_execution(stream_size_type n);
    time_type end_execution();
    std::string estimate_remaining_time(double progress);

    static void start_pause();
    static void end_pause();
    static void disable_time_storing();

    //Used by fractional_time_perdictor
    //TPIE_OS_OFFSET m_aux1;
    //double m_aux2;
private:
    hash_type m_id;
    boost::posix_time::ptime m_start_time;
    time_type m_estimate;
    double m_confidence;

    stream_size_type m_n;

    time_type m_pause_time_at_start;

#ifndef TPIE_NDEBUG
    std::string m_name;
#endif

    static time_type s_pause_time;
    static boost::posix_time::ptime s_start_pause_time;
    static bool s_store_times;
};

} //namespace tpie

#endif //__TPIE_EXECUTION_TIME_PREDICTOR_H__