79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
//=====================================================
|
|
// File : STL_Timer.hh
|
|
// Author : L. Plagne <laurent.plagne@edf.fr)>
|
|
// Copyright (C) EDF R&D, mar déc 3 18:59:35 CET 2002
|
|
//=====================================================
|
|
//
|
|
// 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.
|
|
//
|
|
// STL Timer Class. Adapted (L.P.) from the timer class by Musser et Al
|
|
// described int the Book : STL Tutorial and reference guide.
|
|
// Define a timer class for analyzing algorithm performance.
|
|
#include <iostream>
|
|
#include <iomanip>
|
|
#include <vector>
|
|
#include <map>
|
|
#include <algorithm>
|
|
using namespace std;
|
|
|
|
class STL_Timer {
|
|
public:
|
|
STL_Timer(){ baseline = false; }; // Default constructor
|
|
// Start a series of r trials:
|
|
void start(unsigned int r){
|
|
reps = r;
|
|
count = 0;
|
|
iterations.clear();
|
|
iterations.reserve(reps);
|
|
initial = time(0);
|
|
};
|
|
// Start a series of r trials to determine baseline time:
|
|
void start_baseline(unsigned int r)
|
|
{
|
|
baseline = true;
|
|
start(r);
|
|
}
|
|
// Returns true if the trials have been completed, else false
|
|
bool check()
|
|
{
|
|
++count;
|
|
final = time(0);
|
|
if (initial < final) {
|
|
iterations.push_back(count);
|
|
initial = final;
|
|
count = 0;
|
|
}
|
|
return (iterations.size() < reps);
|
|
};
|
|
// Returns the results for external use
|
|
double get_time( void )
|
|
{
|
|
sort(iterations.begin(), iterations.end());
|
|
return 1.0/iterations[reps/2];
|
|
};
|
|
private:
|
|
unsigned int reps; // Number of trials
|
|
// For storing loop iterations of a trial
|
|
vector<long> iterations;
|
|
// For saving initial and final times of a trial
|
|
time_t initial, final;
|
|
// For counting loop iterations of a trial
|
|
unsigned long count;
|
|
// true if this is a baseline computation, false otherwise
|
|
bool baseline;
|
|
// For recording the baseline time
|
|
double baseline_time;
|
|
};
|
|
|