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/*
* Copyright (c) 2001 Matteo Frigo
* Copyright (c) 2001 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 1.13 2006-01-30 16:09:32 athena Exp $ */
#include "bench.h"
#include <stdio.h>
/*
* System-dependent timing functions:
*/
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_BSDGETTIMEOFDAY
#ifndef HAVE_GETTIMEOFDAY
#define gettimeofday BSDgettimeofday
#define HAVE_GETTIMEOFDAY 1
#endif
#endif
double time_min;
int time_repeat;
#if !defined(HAVE_TIMER) && (defined(__WIN32__) || defined(_WIN32) || defined(_WINDOWS) || defined(__CYGWIN__))
#include <windows.h>
typedef LARGE_INTEGER mytime;
static mytime get_time(void)
{
mytime tv;
QueryPerformanceCounter(&tv);
return tv;
}
static double elapsed(mytime t1, mytime t0)
{
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);
return ((double) (t1.QuadPart - t0.QuadPart)) /
((double) freq.QuadPart);
}
#define HAVE_TIMER
#endif
#if defined(HAVE_GETTIMEOFDAY) && !defined(HAVE_TIMER)
typedef struct timeval mytime;
static mytime get_time(void)
{
struct timeval tv;
gettimeofday(&tv, 0);
return tv;
}
static double elapsed(mytime t1, mytime t0)
{
return (double)(t1.tv_sec - t0.tv_sec) +
(double)(t1.tv_usec - t0.tv_usec) * 1.0E-6;
}
#define HAVE_TIMER
#endif
#ifndef HAVE_TIMER
#error "timer not defined"
#endif
static const double tmax_try = 1.0; /* seconds */
static const int nmin = 128, nmax = 133;
static double time_one(int n)
{
float X[16], Y[16];
int i;
mytime t0, t1;
for (i = 0; i < 16; ++i)
X[i] = 0;
t0 = get_time();
for (i = 0; i < n; ++i)
bench_fft8(X, X+1, Y, Y+1, 2, 2);
t1 = get_time();
return (elapsed(t1, t0));
}
static double time_n(int n)
{
int i;
double tmin;
tmin = time_one(n);
for (i = 1; i < time_repeat; ++i) {
double t = time_one(n);
if (t < tmin)
tmin = t;
}
return tmin;
}
static int good_enough_p(int n, double *tp)
{
int i;
double t = 0.0;
/* vary nmin and see if time scales proportionally */
for (i = nmin; i < nmax; ++i) {
double t1 = time_n(n * i);
if (t1 <= 0)
return 0; /* not enough resolution */
if (t1 >= tmax_try) {
t = t1;
break;
}
t = (i == nmin) ? t1 : t;
if (t1 >= (t * (i + 0.5) / nmin))
return 0;
if (t1 <= (t * (i - 0.5) / nmin))
return 0;
}
*tp = t;
return 1;
}
static double calibrate(void)
{
double t = tmax_try;
int n;
for (n = 1; n < (1 << 20); n += n)
if (good_enough_p(n, &t))
break;
return t;
}
void timer_init(double tmin, int repeat)
{
static int inited = 0;
if (inited)
return;
inited = 1;
if (!repeat)
repeat = 8;
time_repeat = repeat;
if (tmin > 0)
time_min = tmin;
else
time_min = calibrate();
}
static mytime t0[BENCH_NTIMERS];
void timer_start(int n)
{
BENCH_ASSERT(n >= 0 && n < BENCH_NTIMERS);
t0[n] = get_time();
}
double timer_stop(int n)
{
mytime t1;
BENCH_ASSERT(n >= 0 && n < BENCH_NTIMERS);
t1 = get_time();
return elapsed(t1, t0[n]);
}
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