timer.cc

来自「Short description: A MAX-MIN Ant System 」· CC 代码 · 共 77 行

/***************************************************************************
                          Timer.cc  -  description
                             -------------------
    begin                : Fri Nov 10 2000
    copyright            : (C) 2000 by Christian Blum
    email                : [e-mail]
 ***************************************************************************/

/***************************************************************************
    Program's name: hc-mmas-ubqp

    Ant Colony Optimization algorithm to tackle 
    Unary Binary Quadratic Programming

    Copyright (C) 2003  Christian Blum

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Author's contact details: 

    email: [e-mail]
    mail address: Universite Libre de Bruxelles, IRIDIA,
                  Av. Franklin Roosevelt 50, CP 194/6,
                  B-1050 Brussels, Belgium

 ***************************************************************************/

#include "Timer.h"

/*
 *  The virtual time of day and the real time of day are calculated and
 *  stored for future use.  The future use consists of subtracting these
 *  values from similar values obtained at a later time to allow the user
 *  to get the amount of time used by the algorithm.
 */
Timer::Timer(void) {
  getrusage( RUSAGE_SELF, &res );
  virtual_time = (double) res.ru_utime.tv_sec +
    (double) res.ru_stime.tv_sec +
    (double) res.ru_utime.tv_usec * 1.0E-6 +
    (double) res.ru_stime.tv_usec * 1.0E-6;
  
  gettimeofday( &tp, NULL );
  real_time =    (double) tp.tv_sec + (double) tp.tv_usec * 1.0E-6;
}

/*
 *  Stop the stopwatch and return the time used in seconds (either
 *  REAL or VIRTUAL time, depending on ``type'').
 */
double Timer::elapsed_time(const TYPE& type) {
  if (type == REAL) {
    gettimeofday( &tp, NULL );
    return( (double) tp.tv_sec + (double) tp.tv_usec * 1.0E-6 - real_time );
  }
  else {
    getrusage( RUSAGE_SELF, &res );
    return( (double) res.ru_utime.tv_sec +
	    (double) res.ru_stime.tv_sec +
	    (double) res.ru_utime.tv_usec * 1.0E-6 +
	    (double) res.ru_stime.tv_usec * 1.0E-6
	    - virtual_time );
  }
}