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/*
* Copyright (c) 2003 Matteo Frigo
* Copyright (c) 2003 Massachusetts Institute of Technology
*
* 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
*
*/
/* $Id: timer.c,v 1.1 2008/10/17 06:11:29 scuri Exp $ */
#include "ifftw.h"
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifndef WITH_SLOW_TIMER
# include "cycle.h"
#else
# if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
# else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
# endif
#endif
#ifndef FFTW_TIME_LIMIT
#define FFTW_TIME_LIMIT 2.0 /* don't run for more than two seconds */
#endif
#ifdef HAVE_BSDGETTIMEOFDAY
#ifndef HAVE_GETTIMEOFDAY
#define gettimeofday BSDgettimeofday
#define HAVE_GETTIMEOFDAY 1
#endif
#endif
#if defined(HAVE_GETTIMEOFDAY) && !defined(HAVE_SECONDS_TIMER)
typedef struct timeval seconds;
static seconds getseconds(void)
{
struct timeval tv;
gettimeofday(&tv, 0);
return tv;
}
static double elapsed_sec(seconds t1, seconds t0)
{
return (double)(t1.tv_sec - t0.tv_sec) +
(double)(t1.tv_usec - t0.tv_usec) * 1.0E-6;
}
# define TIME_MIN_SEC 1.0e-2 /* from fftw2 */
# define HAVE_SECONDS_TIMER
#endif
#ifndef HAVE_SECONDS_TIMER
# include <time.h>
typedef clock_t seconds;
static seconds getseconds(void) { return clock(); }
static double elapsed_sec(seconds t1, seconds t0)
{
return ((double) (t1 - t0)) / CLOCKS_PER_SEC;
}
# define TIME_MIN_SEC 2.0e-1 /* from fftw2 */
# define HAVE_SECONDS_TIMER
#endif
#ifdef WITH_SLOW_TIMER
/* excruciatingly slow; only use this if there is no choice! */
typedef seconds ticks;
# define getticks getseconds
# define elapsed elapsed_sec
# define TIME_MIN TIME_MIN_SEC
# define TIME_REPEAT 4 /* from fftw2 */
# define HAVE_TICK_COUNTER
#endif
#ifdef HAVE_TICK_COUNTER
# ifndef TIME_MIN
# define TIME_MIN 100.0
# endif
# ifndef TIME_REPEAT
# define TIME_REPEAT 8
# endif
static double measure(plan *pln, const problem *p, int iter)
{
ticks t0, t1;
int i;
t0 = getticks();
for (i = 0; i < iter; ++i)
pln->adt->solve(pln, p);
t1 = getticks();
return elapsed(t1, t0);
}
double X(measure_execution_time)(plan *pln, const problem *p)
{
seconds begin, now;
double t, tmax, tmin;
int iter;
int repeat;
AWAKE(pln, 1);
p->adt->zero(p);
start_over:
for (iter = 1; iter; iter *= 2) {
tmin = 1.0E10;
tmax = -1.0E10;
begin = getseconds();
/* repeat the measurement TIME_REPEAT times */
for (repeat = 0; repeat < TIME_REPEAT; ++repeat) {
t = measure(pln, p, iter);
if (t < 0)
goto start_over;
if (t < tmin)
tmin = t;
if (t > tmax)
tmax = t;
/* do not run for too long */
now = getseconds();
t = elapsed_sec(now, begin);
if (t > FFTW_TIME_LIMIT)
break;
}
if (tmin >= TIME_MIN) {
tmin /= (double) iter;
tmax /= (double) iter;
AWAKE(pln, 0);
return tmin;
}
}
goto start_over; /* may happen if timer is screwed up */
}
#else /* no cycle counter */
double X(measure_execution_time)(plan *pln, const problem *p)
{
UNUSED(p);
UNUSED(pln);
return -1.0;
}
#endif
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