timehist.c File Reference

This file contains functions to make a histogram of time values. More...

#include "config.h"
#include <sys/time.h>
#include <sys/types.h>
#include "util/timehist.h"
#include "util/log.h"
#include "util/timeval_func.h"

Functions
static void	timestwo (struct timeval *v)
	special timestwo operation for time values in histogram setup
static void	dosetup (struct timehist *hist)
	do setup exponentially
struct timehist *	timehist_setup (void)
	Setup a histogram, default. More...
void	timehist_delete (struct timehist *hist)
	Delete histogram. More...
void	timehist_clear (struct timehist *hist)
	Clear histogram. More...
void	timehist_insert (struct timehist *hist, struct timeval *tv)
	Add time value to histogram. More...
void	timehist_print (struct timehist *hist)
	Printout histogram. More...
void	timehist_log (struct timehist *hist, const char *name)
	Log histogram, print it to the logfile. More...
static size_t	timehist_count (struct timehist *hist)
	total number in histogram
double	timehist_quartile (struct timehist *hist, double q)
	Find time value for given quartile, such as 0.25, 0.50, 0.75. More...
void	timehist_export (struct timehist *hist, long long *array, size_t sz)
	Export histogram to an array. More...
void	timehist_import (struct timehist *hist, long long *array, size_t sz)
	Import histogram from an array. More...

Detailed Description

This file contains functions to make a histogram of time values.

Function Documentation

timehist_setup()

struct timehist* timehist_setup

(

void

)

Setup a histogram, default.

Returns

histogram or NULL on malloc failure.

References timehist::buckets, dosetup(), timehist::num, and NUM_BUCKETS_HIST.

Referenced by mesh_create(), and print_hist().

timehist_delete()

void timehist_delete

(

struct timehist *

hist

)

Delete histogram.

Parameters

hist

to delete

References timehist::buckets.

Referenced by mesh_delete(), and print_hist().

timehist_clear()

void timehist_clear

(

struct timehist *

hist

)

Clear histogram.

Parameters

hist	to clear all data from

References timehist::buckets, th_buck::count, and timehist::num.

Referenced by mesh_stats_clear().

timehist_insert()

void timehist_insert	(	struct timehist *	hist,
		struct timeval *	tv
	)

Add time value to histogram.

Parameters

hist	histogram
tv	time value

References timehist::buckets, th_buck::count, timehist::num, timeval_smaller(), and th_buck::upper.

timehist_print()

void timehist_print

(

struct timehist *

hist

)

Printout histogram.

Parameters

hist

histogram

References timehist::buckets, th_buck::count, th_buck::lower, timehist::num, and th_buck::upper.

timehist_log()

void timehist_log	(	struct timehist *	hist,
		const char *	name
	)

Log histogram, print it to the logfile.

Parameters

hist	histogram
name	the name of the value column

References timehist::buckets, th_buck::count, log_info(), th_buck::lower, timehist::num, timehist_quartile(), and th_buck::upper.

timehist_quartile()

double timehist_quartile	(	struct timehist *	hist,
		double	q
	)

Find time value for given quartile, such as 0.25, 0.50, 0.75.

The looks up the value for the i-th element in the sorted list of time values, as approximated using the histogram.

Parameters

hist	histogram. Interpolated information is used from it.
q	quartile, 0.50 results in the median. Must be >0 and <1.

Returns

: the time in seconds for that percentage.

References timehist::buckets, th_buck::count, th_buck::lower, timehist::num, timehist_count(), and th_buck::upper.

Referenced by server_stats_compile(), and timehist_log().

timehist_export()

void timehist_export	(	struct timehist *	hist,
		long long *	array,
		size_t	sz
	)

Export histogram to an array.

Parameters

hist	histogram
array	the array to export to.
sz	number of items in array.

References timehist::buckets, th_buck::count, and timehist::num.

Referenced by server_stats_compile().

timehist_import()

void timehist_import	(	struct timehist *	hist,
		long long *	array,
		size_t	sz
	)

Import histogram from an array.

Parameters

hist	histogram
array	the array to import from.
sz	number of items in array.

References timehist::buckets, th_buck::count, and timehist::num.

Referenced by print_hist().