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/*
* LIBOIL - Library of Optimized Inner Loops
* Copyright (c) 2003,2004 David A. Schleef <ds@schleef.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <liboil/liboilprofile.h>
#include <liboil/liboildebug.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <time.h>
#include <string.h>
#include <math.h>
/**
* SECTION:liboilprofile
* @title:OilProfile
* @short_description:
* Measuring the length of time needed to execute Liboil functions.
*
*/
/**
* oil_profile_init:
* @prof: the OilProfile structure
*
* Initializes a profiling structure.
*/
void
oil_profile_init (OilProfile *prof)
{
memset(prof, 0, sizeof(OilProfile));
prof->min = -1;
}
/**
* oil_profile_stop_handle:
* @prof: the OilProfile structure
*
* Handles post-processing of a single profiling run.
*
* FIXME: need more info
*/
void
oil_profile_stop_handle (OilProfile *prof)
{
int i;
prof->last = prof->stop - prof->start;
prof->total += prof->last;
prof->n++;
if (prof->last < prof->min) prof->min = prof->last;
for(i=0;i<prof->hist_n;i++) {
if (prof->last == prof->hist_time[i]) {
prof->hist_count[i]++;
break;
}
}
if (i == prof->hist_n && prof->hist_n < OIL_PROFILE_HIST_LENGTH) {
prof->hist_time[prof->hist_n] = prof->last;
prof->hist_count[prof->hist_n] = 1;
prof->hist_n++;
}
}
/**
* oil_profile_get_ave_std:
* @prof: the OilProfile structure
* @ave_p: pointer to average
* @std_p: pointer to standard deviation
*
* Calculates the average and standard deviation of a number of
* profiling runs, and places the results in the locations
* provided by @ave_p and @std_p. Either @ave_p and @std_p may
* be NULL, in which case the values will not be written.
*/
void
oil_profile_get_ave_std (OilProfile *prof, double *ave_p, double *std_p)
{
double ave;
double std;
int max_i;
double off;
double s;
double s2;
int i;
int n;
double x;
do {
s = s2 = 0;
n = 0;
max_i = -1;
for(i=0;i<10;i++){
x = prof->hist_time[i];
s2 += x * x * prof->hist_count[i];
s += x * prof->hist_count[i];
n += prof->hist_count[i];
if (prof->hist_count[i] > 0) {
if (max_i == -1 || prof->hist_time[i] > prof->hist_time[max_i]) {
max_i = i;
}
}
}
ave = s / n;
std = sqrt (s2 - s * s / n + n*n) / (n-1);
off = (prof->hist_time[max_i] - ave)/std;
if (off > 4.0) {
prof->hist_count[max_i] = 0;
}
} while (off > 4.0);
if (ave_p) *ave_p = ave;
if (std_p) *std_p = std;
}
unsigned long (*_oil_profile_stamp)(void);
/**
* oil_profile_stamp:
*
* Creates a timestamp based on a CPU-specific high-frequency
* counter, if available.
*
* Returns: a timestamp
*/
unsigned long
oil_profile_stamp (void)
{
return _oil_profile_stamp();
}
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