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/* Replacement for CSIM histogram created by Alex Carobus 7/20/98
#include <std/disclaimer.h>
*/
/*
//
// Update history:
//
// [99.10.18] jcohen
// version 1.3
// added optional fields to header
// to use: add_field("key","value",histogram);
// or: add_field_n("key",45,histogram);
//
// [99.01.08] jcohen
// version 1.2
// histogram includes skew and kurtosis
// call enable_skew(h) to enable skew and kurtosis on histogram h
//
// [98.07.29] jcohen
// added add_histogram function
// added version 1.1 display, added num_bins display
// added read_hist
//
*/
#include "ace/OS_NS_stdio.h"
#include "ace/OS_NS_stdlib.h"
#include <float.h>
#include "ace/OS_NS_string.h"
#include "ace/OS_NS_math.h"
#include "hist.h"
namespace ACE_SCTP
{
hist_t *head_hist, *tail_hist;
hist_t *histogram(char *name, unsigned int num_bins, double first,
double last) {
ACE_SCTP::hist_t *hist;
if ((hist = (hist_t *)ACE_OS::malloc(sizeof(hist_t))) == 0) {
ACE_OS::fprintf(stderr, "unable to allocate memory for histogram : %s", name);
ACE_OS::exit(-1);
}
if ((hist->hs = (unsigned int *)ACE_OS::malloc(sizeof(unsigned int) * (num_bins+2))) == 0){
ACE_OS::fprintf(stderr, "unable to allocate memory for histogram : %s", name);
ACE_OS::exit(-1);
}
ACE_OS::memset(hist->hs, 0, sizeof(unsigned int) * (num_bins+2));
hist->name = name;
hist->num_bins = num_bins;
hist->first = first;
hist->last = last;
hist->num_points = 0;
hist->max_num_outer = hist->num_outer = 0;
hist->sum = 0.0;
hist->sum2 = 0.0;
hist->sum3 = 0.0;
hist->sum4 = 0.0;
hist->max = DBL_MIN;
hist->min = DBL_MAX;
hist->outer = 0;
hist->next = 0;
hist->skew = 0;
hist->firstoptheader = 0;
if(head_hist == 0)
head_hist = tail_hist = hist;
else {
tail_hist->next = hist;
tail_hist = tail_hist->next;
}
return hist;
}
void set_outer(unsigned int max_num_outer, hist_t *hist) {
hist->outer = (double *)ACE_OS::realloc(hist->outer,sizeof(double) * max_num_outer);
hist->max_num_outer = max_num_outer;
}
void enable_skew(hist_t *hist) {
hist->skew = 1;
}
void add_field(char *key, char *value, hist_t *hist) {
struct optheader *nextoptheader, *trace;
/* create and prepare nextoptheader */
nextoptheader = (struct optheader *) ACE_OS::malloc(sizeof(struct optheader));
nextoptheader->key = (char *) ACE_OS::malloc(ACE_OS::strlen(key)+1);
nextoptheader->value = (char *) ACE_OS::malloc(ACE_OS::strlen(value)+1);
nextoptheader->next = 0;
ACE_OS::strcpy(nextoptheader->key,key);
ACE_OS::strcpy(nextoptheader->value,value);
/* tack nextoptheader onto end of optheader list */
if (hist->firstoptheader == 0) {
hist->firstoptheader = nextoptheader;
} else {
trace = hist->firstoptheader;
while (trace->next != 0) {
trace = trace->next;
}
trace->next = nextoptheader;
}
}
void add_field_n(char *key, int value, hist_t *hist) {
char textvalue[40];
ACE_OS::sprintf(textvalue,"%d",value);
add_field(key,textvalue,hist);
}
void record(double point, hist_t *hist) {
unsigned int bin;
double incsum;
if (point < hist->min) hist->min = point;
if (point > hist->max) hist->max = point;
if (point < hist->first) {
bin = 0;
if (hist->max_num_outer > hist->num_outer)
hist->outer[hist->num_outer++] = point;
}
else if (point >= hist->last) {
bin = hist->num_bins+1;
if (hist->max_num_outer > hist->num_outer)
hist->outer[hist->num_outer++] = point;
}
else
bin = (unsigned int)(((point - hist->first)*(hist->num_bins))/(hist->last - hist->first)+1);
hist->hs[bin]++;
hist->num_points++;
hist->sum+=point;
incsum = point*point;
hist->sum2 += incsum;
if (hist->skew) {
incsum *= point;
hist->sum3 += incsum;
incsum *= point;
hist->sum4 += incsum;
}
/* printf("point : %g, bin %u, points in bin %u\n", point, bin, hist->hs[bin]); */
}
void report_to(FILE *strm, hist_t *hist) {
unsigned int sofar, i;
double p1, p2, d, mean;
double variance;
struct optheader *trace;
if (hist->num_points == 0) {
ACE_OS::fprintf(strm, "\n\n\t\t\t\tHistogram %s is empty\n\n", hist->name);
return;
}
ACE_OS::fprintf(strm, "\n\n\t\t\t\tHistogram %s\n", hist->name);
if (hist->skew) ACE_OS::fprintf(strm, "version: %s\n", HIST_VERSION);
else ACE_OS::fprintf(strm, "version: 1.1\n");
ACE_OS::fprintf(strm, "minimum: %g\n", hist->min);
ACE_OS::fprintf(strm, "maximum: %g\n", hist->max);
ACE_OS::fprintf(strm, "mean: %g\n", mean = hist->sum/hist->num_points);
variance = (hist->sum2 -
2*hist->sum*mean +
hist->num_points*mean*mean) / (hist->num_points-1);
ACE_OS::fprintf(strm, "variance: %g\n", variance);
if (hist->skew)
{
ACE_OS::fprintf(strm, "skew: %g\n", ((hist->sum3 -
3*hist->sum2*mean +
3*hist->sum*mean*mean -
hist->num_points*mean*mean*mean) /
pow(sqrt(variance),3) / hist->num_points));
ACE_OS::fprintf(strm, "kurtosis: %g\n", ((hist->sum4 -
4*hist->sum3*mean +
6*hist->sum2*mean*mean -
4*hist->sum*mean*mean*mean +
hist->num_points*mean*mean*mean*mean) /
pow(sqrt(variance),4)) / hist->num_points - 3);
}
ACE_OS::fprintf(strm, "num_points: %u\n", hist->num_points);
ACE_OS::fprintf(strm, "num_bins: %d %g %g\n", hist->num_bins,hist->first,hist->last);
if (hist->firstoptheader) {
trace = hist->firstoptheader;
while(trace->next != 0)
{
ACE_OS::fprintf(strm, "%s: %s\n", trace->key, trace->value);
trace = trace->next;
}
ACE_OS::fprintf(strm, "%s: %s\n", trace->key, trace->value);
}
ACE_OS::fprintf(strm, "\n");
sofar = hist->hs[0];
ACE_OS::fprintf(strm, "\t Low - High Count Fraction Cumulative\n");
ACE_OS::fprintf(strm, "\t below - %12.3f : %5u %0.3f %0.3f\n", hist->first,
hist->hs[0], (double)hist->hs[0]/hist->num_points,
(double)histfloor(1000.0*sofar/hist->num_points)/1000.0);
p2 = hist->first;
d = (hist->last - hist->first)/hist->num_bins;
for(i = 1; i <= hist->num_bins; i++) {
p1 = p2;
p2 = i*d+hist->first;
sofar += hist->hs[i];
ACE_OS::fprintf(strm, "\t%12.3f - %12.3f : %5u %0.3f %0.3f\n", p1, p2, hist->hs[i],
(double)hist->hs[i]/hist->num_points,
(double)histfloor(1000.0*sofar/hist->num_points)/1000.0);
}
sofar += hist->hs[hist->num_bins+1];
ACE_OS::fprintf(strm, "\t%12.3f - above : %5u %0.3f %0.3f\n\n",
hist->last, hist->hs[hist->num_bins+1],
(double)hist->hs[hist->num_bins+1]/hist->num_points,
(double)histfloor(1000.0*sofar/hist->num_points)/1000.0);
if (hist->num_outer)
{
ACE_OS::fprintf(strm, "outliers:\n");
for(i = 0; i < hist->num_outer; i++) ACE_OS::fprintf(strm, "\t%12.3f\n",
hist->outer[i]);
}
ACE_OS::fprintf(strm, "\n\n");
}
void report() {
hist_t *temp = head_hist;
for(; temp; temp = temp->next)
report_to(stdout, temp);
}
void stats_init() {
/* this is not necessary */
}
double get_mean(HIST hist) {
return(hist->sum/hist->num_points);
}
double get_min(HIST hist) {
return(hist->min);
}
double get_max(HIST hist) {
return(hist->max);
}
double get_variance(HIST hist) {
double mean = hist->sum/hist->num_points;
return((hist->sum2 - 2*hist->sum*mean + hist->num_points*mean*mean)/
(hist->num_points-1));
}
double get_num(HIST hist) {
return(hist->num_points);
}
void set_mean(HIST hist, double mean) {
hist->sum = mean*hist->num_points;
}
void set_min(HIST hist, double min) {
hist->min = min;
}
void set_max(HIST hist, double max) {
hist->max = max;
}
void set_variance(HIST hist, double variance) {
/* do this after seting mean */
double mean = hist->sum/hist->num_points;
hist->sum2 = variance *(hist->num_points-1) + 2*hist->sum*mean - hist->num_points*mean*mean;
}
void add_histogram(HIST dest, HIST source) {
unsigned int i,j;
double d,midpoint;
d = (source->last - source->first)/source->num_bins;
for(i=1;i<=source->num_bins;i++) {
midpoint = source->first + ((i - 0.5) * d);
for(j=0;j<source->hs[i];j++) {
record(midpoint,dest);
}
}
for(i=0;i<source->num_outer;i++)
record(source->outer[i],dest);
set_min(dest, get_min(source));
set_max(dest, get_max(source));
set_mean(dest, get_mean(source));
set_variance(dest, get_variance(source));
}
double histfloor (double x) {
#ifdef WIN32
return ACE_OS::floor(x);
#else
return static_cast<double> (static_cast<long long> (x));
#endif
}
}
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