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/* FLAC - Free Lossless Audio Codec
* Copyright (C) 2015-2016 Xiph.Org Foundation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the Xiph.org Foundation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include "util.h"
#if defined _WIN32
#include <windows.h>
static double
counter_diff (const LARGE_INTEGER * start, const LARGE_INTEGER * end)
{
LARGE_INTEGER diff, freq;
QueryPerformanceFrequency(&freq);
diff.QuadPart = end->QuadPart - start->QuadPart;
return (double)diff.QuadPart/(double)freq.QuadPart;
}
double
benchmark_function (void (*testfunc) (void), unsigned count)
{
LARGE_INTEGER start, end;
unsigned k;
QueryPerformanceCounter (&start) ;
for (k = 0 ; k < count ; k++)
testfunc();
QueryPerformanceCounter (&end) ;
return counter_diff (&start, &end) / count ;
} /* benchmark_function */
#elif defined FLAC__SYS_DARWIN
#include <mach/mach_time.h>
static double
counter_diff (const uint64_t * start, const uint64_t * end)
{
mach_timebase_info_data_t t_info;
mach_timebase_info(&t_info);
uint64_t duration = *end - *start;
return duration * ((double)t_info.numer/(double)t_info.denom);
}
double
benchmark_function (void (*testfunc) (void), unsigned count)
{
uint64_t start, end;
unsigned k;
start = mach_absolute_time();
for (k = 0 ; k < count ; k++)
testfunc();
end = mach_absolute_time();
return counter_diff (&start, &end) / count ;
} /* benchmark_function */
#elif defined HAVE_CLOCK_GETTIME
#include <time.h>
#include <sys/time.h>
static double
timespec_diff (const struct timespec * start, const struct timespec * end)
{ struct timespec diff;
if (end->tv_nsec - start->tv_nsec < 0)
{ diff.tv_sec = end->tv_sec - start->tv_sec - 1 ;
diff.tv_nsec = 1000000000 + end->tv_nsec - start->tv_nsec ;
}
else
{ diff.tv_sec = end->tv_sec - start->tv_sec ;
diff.tv_nsec = end->tv_nsec-start->tv_nsec ;
} ;
return diff.tv_sec + 1e-9 * diff.tv_nsec ;
}
double
benchmark_function (void (*testfunc) (void), unsigned count)
{ struct timespec start, end;
unsigned k ;
clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &start) ;
for (k = 0 ; k < count ; k++)
testfunc () ;
clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &end) ;
return timespec_diff (&start, &end) / count ;
} /* benchmark_function */
#else
#include <time.h>
#include <sys/time.h>
static double
timeval_diff (const struct timeval * start, const struct timeval * end)
{ struct timeval diff;
if (end->tv_usec - start->tv_usec < 0)
{ diff.tv_sec = end->tv_sec - start->tv_sec - 1 ;
diff.tv_usec = 1000000 + end->tv_usec - start->tv_usec ;
}
else
{ diff.tv_sec = end->tv_sec - start->tv_sec ;
diff.tv_usec = end->tv_usec-start->tv_usec ;
} ;
return diff.tv_sec + 1e-6 * diff.tv_usec ;
}
double
benchmark_function (void (*testfunc) (void), unsigned count)
{ struct timeval start, end;
unsigned k ;
gettimeofday(&start, NULL);
for (k = 0 ; k < count ; k++)
testfunc () ;
gettimeofday(&end, NULL);
return timeval_diff (&start, &end) / count ;
} /* benchmark_function */
#endif
static int
double_cmp (const void * a, const void * b)
{ const double * pa = (double *) a ;
const double * pb = (double *) b ;
return pa [0] < pb [0] ;
} /* double_cmp */
void
benchmark_stats (bench_stats * stats)
{ double sum, times [stats->run_count] ;
unsigned k ;
for (k = 0 ; k < stats->run_count ; k++)
times [k] = benchmark_function (stats->testfunc, stats->loop_count) ;
qsort (times, stats->run_count, sizeof (times [0]), double_cmp) ;
sum = 0.0 ;
stats->min_time = stats->max_time = times [0] ;
for (k = 0 ; k < stats->run_count ; k++)
{ stats->min_time = stats->min_time < times [k] ? stats->min_time : times [k] ;
stats->max_time = stats->max_time > times [k] ? stats->max_time : times [k] ;
sum += times [k] ;
}
stats->mean_time = sum / stats->run_count ;
if (stats->run_count & 1)
stats->median_time = times [(stats->run_count + 1) / 2] ;
else
stats->median_time = 0.5 * (times [stats->run_count / 2] + times [(stats->run_count / 2) + 1]) ;
return ;
} /* benchmark_stats */
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