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/* timing.cpp -- Measure computation times
Copyright 2006 Matthias Koeppe
This file is part of LattE.
LattE is free software; you can redistribute it and/or modify it
under the terms of the version 2 of the GNU General Public License
as published by the Free Software Foundation.
LattE 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 LattE; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <sys/times.h>
#include <cassert>
#include <unistd.h>
#include "timing.h"
#include <iostream>
using namespace std;
clock_t Timer::ticks_per_second;
Timer::Timer(const std::string &a_name, bool start_timer) :
name(a_name), ticks_elapsed(0), started(false)
{
ticks_per_second = sysconf(_SC_CLK_TCK);
if (start_timer) start();
}
void Timer::start()
{
assert(!started);
struct tms buf;
clock_t t = times(&buf);
assert(t != -1);
start_time = buf.tms_utime + buf.tms_stime
+ buf.tms_cutime + buf.tms_cstime;
started = true;
}
void Timer::stop()
{
assert(started);
struct tms buf;
clock_t t = times(&buf);
assert(t != -1);
ticks_elapsed += (buf.tms_utime + buf.tms_stime
+ buf.tms_cutime + buf.tms_cstime)
- start_time;
started = false;
}
void Timer::clear()
{
assert(!started);
ticks_elapsed = 0;
}
float Timer::get_seconds() const
{
assert(!started);
return ticks_elapsed / (1.0 * ticks_per_second);
}
ostream &operator<< (ostream &s, const Timer &timer)
{
s << timer.name << ": " << timer.get_seconds() << " sec" << endl;
return s;
}
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