248 lines
6.0 KiB
C
248 lines
6.0 KiB
C
/*
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* util/timehist.c - make histogram of time values.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains functions to make a histogram of time values.
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*/
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#include "config.h"
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#ifdef HAVE_TIME_H
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#include <time.h>
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#endif
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#include <sys/time.h>
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#include <sys/types.h>
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#include "util/timehist.h"
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#include "util/log.h"
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/** special timestwo operation for time values in histogram setup */
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static void
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timestwo(struct timeval* v)
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{
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#ifndef S_SPLINT_S
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if(v->tv_sec == 0 && v->tv_usec == 0) {
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v->tv_usec = 1;
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return;
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}
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v->tv_sec *= 2;
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v->tv_usec *= 2;
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if(v->tv_usec == 1024*1024) {
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/* nice values and easy to compute */
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v->tv_sec = 1;
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v->tv_usec = 0;
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}
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#endif
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}
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/** do setup exponentially */
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static void
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dosetup(struct timehist* hist)
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{
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struct timeval last;
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size_t i;
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memset(&last, 0, sizeof(last));
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for(i=0; i<hist->num; i++) {
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hist->buckets[i].lower = last;
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timestwo(&last);
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hist->buckets[i].upper = last;
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hist->buckets[i].count = 0;
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}
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}
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struct timehist* timehist_setup(void)
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{
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struct timehist* hist = (struct timehist*)calloc(1,
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sizeof(struct timehist));
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if(!hist)
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return NULL;
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hist->num = NUM_BUCKETS_HIST;
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hist->buckets = (struct th_buck*)calloc(hist->num,
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sizeof(struct th_buck));
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if(!hist->buckets) {
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free(hist);
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return NULL;
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}
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/* setup the buckets */
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dosetup(hist);
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return hist;
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}
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void timehist_delete(struct timehist* hist)
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{
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if(!hist)
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return;
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free(hist->buckets);
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free(hist);
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}
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void timehist_clear(struct timehist* hist)
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{
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size_t i;
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for(i=0; i<hist->num; i++)
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hist->buckets[i].count = 0;
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}
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/** histogram compare of time values */
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static int
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timeval_smaller(const struct timeval* x, const struct timeval* y)
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{
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#ifndef S_SPLINT_S
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if(x->tv_sec < y->tv_sec)
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return 1;
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else if(x->tv_sec == y->tv_sec) {
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if(x->tv_usec <= y->tv_usec)
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return 1;
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else return 0;
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}
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else return 0;
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#endif
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}
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void timehist_insert(struct timehist* hist, struct timeval* tv)
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{
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size_t i;
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for(i=0; i<hist->num; i++) {
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if(timeval_smaller(tv, &hist->buckets[i].upper)) {
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hist->buckets[i].count++;
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return;
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}
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}
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/* dump in last bucket */
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hist->buckets[hist->num-1].count++;
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}
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void timehist_print(struct timehist* hist)
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{
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#ifndef S_SPLINT_S
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size_t i;
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for(i=0; i<hist->num; i++) {
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if(hist->buckets[i].count != 0) {
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printf("%4d.%6.6d %4d.%6.6d %u\n",
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(int)hist->buckets[i].lower.tv_sec,
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(int)hist->buckets[i].lower.tv_usec,
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(int)hist->buckets[i].upper.tv_sec,
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(int)hist->buckets[i].upper.tv_usec,
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(unsigned)hist->buckets[i].count);
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}
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}
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#endif
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}
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void timehist_log(struct timehist* hist, const char* name)
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{
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#ifndef S_SPLINT_S
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size_t i;
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log_info("[25%%]=%g median[50%%]=%g [75%%]=%g",
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timehist_quartile(hist, 0.25),
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timehist_quartile(hist, 0.50),
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timehist_quartile(hist, 0.75));
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/* 0000.000000 0000.000000 0 */
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log_info("lower(secs) upper(secs) %s", name);
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for(i=0; i<hist->num; i++) {
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if(hist->buckets[i].count != 0) {
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log_info("%4d.%6.6d %4d.%6.6d %u",
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(int)hist->buckets[i].lower.tv_sec,
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(int)hist->buckets[i].lower.tv_usec,
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(int)hist->buckets[i].upper.tv_sec,
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(int)hist->buckets[i].upper.tv_usec,
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(unsigned)hist->buckets[i].count);
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}
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}
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#endif
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}
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/** total number in histogram */
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static size_t
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timehist_count(struct timehist* hist)
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{
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size_t i, res = 0;
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for(i=0; i<hist->num; i++)
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res += hist->buckets[i].count;
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return res;
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}
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double
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timehist_quartile(struct timehist* hist, double q)
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{
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double lookfor, passed, res;
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double low = 0, up = 0;
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size_t i;
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if(!hist || hist->num == 0)
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return 0.;
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/* look for i'th element, interpolated */
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lookfor = (double)timehist_count(hist);
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if(lookfor < 4)
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return 0.; /* not enough elements for a good estimate */
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lookfor *= q;
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passed = 0;
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i = 0;
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while(i+1 < hist->num &&
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passed+(double)hist->buckets[i].count < lookfor) {
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passed += (double)hist->buckets[i++].count;
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}
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/* got the right bucket */
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#ifndef S_SPLINT_S
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low = (double)hist->buckets[i].lower.tv_sec +
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(double)hist->buckets[i].lower.tv_usec/1000000.;
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up = (double)hist->buckets[i].upper.tv_sec +
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(double)hist->buckets[i].upper.tv_usec/1000000.;
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#endif
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res = (lookfor - passed)*(up-low)/((double)hist->buckets[i].count);
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return low+res;
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}
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void
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timehist_export(struct timehist* hist, size_t* array, size_t sz)
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{
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size_t i;
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if(!hist) return;
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if(sz > hist->num)
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sz = hist->num;
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for(i=0; i<sz; i++)
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array[i] = hist->buckets[i].count;
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}
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void
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timehist_import(struct timehist* hist, size_t* array, size_t sz)
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{
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size_t i;
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if(!hist) return;
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if(sz > hist->num)
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sz = hist->num;
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for(i=0; i<sz; i++)
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hist->buckets[i].count = array[i];
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}
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