#include <StatHist.h>

Inheritance diagram for StatHist:
Collaboration diagram for StatHist:

Public Types

typedef uint64_t bins_type

Public Member Functions

 StatHist ()=default
 StatHist (const StatHist &)
 ~StatHist ()
StatHistoperator= (const StatHist &)
double deltaPctile (const StatHist &B, double pctile) const
double val (unsigned int bin) const
void count (double val)
void dump (StoreEntry *sentry, StatHistBinDumper *bd) const
void logInit (unsigned int capacity, double min, double max)
void enumInit (unsigned int last_enum)
StatHistoperator+= (const StatHist &B)

Protected Member Functions

void init (unsigned int capacity, hbase_f *val_in, hbase_f *val_out, double min, double max)
unsigned int findBin (double v)

Protected Attributes

bins_typebins = nullptr
 the histogram counters More...
unsigned int capacity_ = 0
double min_ = 0.0
 minimum value to be stored, corresponding to the first bin More...
double max_ = 0.0
 value of the maximum counter in the histogram More...
double scale_ = 1.0
 scaling factor when looking for a bin More...
hbase_fval_in = nullptr
hbase_fval_out = nullptr

Detailed Description

Generic histogram class

see important comments on hbase_f restrictions in StatHist.cc

Definition at line 25 of file StatHist.h.

Member Typedef Documentation

◆ bins_type

typedef uint64_t StatHist::bins_type

Definition at line 44 of file StatHist.h.

Constructor & Destructor Documentation

◆ StatHist() [1/2]

StatHist::StatHist ( )
the default constructor doesn't fully initialize. you have to call one of the *init functions to specialize the histogram

merge functionality from the *init functions to the constructor and drop these

specialize the class in a small hierarchy so that all relevant initializations are done at build-time

◆ StatHist() [2/2]

StatHist::StatHist ( const StatHist src)

Definition at line 41 of file StatHist.cc.

References bins, capacity_, NULL, and xcalloc.

◆ ~StatHist()

StatHist::~StatHist ( )

Definition at line 39 of file StatHist.h.

References bins, capacity_, and xfree.

Member Function Documentation

◆ count()

◆ deltaPctile()

double StatHist::deltaPctile ( const StatHist B,
double  pctile 
) const

Calculate the percentile for value pctile for the difference between this and the supplied histogram.

Definition at line 105 of file StatHist.cc.

References a, assert, bins, capacity_, D, i, int, s1, val(), xcalloc, and xfree.

Referenced by statHistDeltaPctile().

◆ dump()

void StatHist::dump ( StoreEntry sentry,
StatHistBinDumper bd 
) const

iterate the supplied bd function over the histogram values

Definition at line 173 of file StatHist.cc.

References assert, bins, capacity_, i, min_, statHistBinDumper, and val().

Referenced by commIncomingStats(), SBufStatsAction::dump(), httpHeaderStatDump(), and statCountersHistograms().

◆ enumInit()

void StatHist::enumInit ( unsigned int  last_enum)

initialize the histogram to count occurrences in an enum-represented set

Definition at line 237 of file StatHist.cc.

References init(), and Math::Null.

Referenced by HttpHeaderStat::HttpHeaderStat(), statCountersInitSpecial(), testStatHist::testStatHistBaseAssignment(), and testStatHist::testStatHistBaseEquality().

◆ findBin()

unsigned int StatHist::findBin ( double  v)

find what entry in the histogram corresponds to v, by applying the preset input transformation function

Definition at line 66 of file StatHist.cc.

References capacity_, min_, scale_, and val_in.

Referenced by count(), and InspectingStatHist::counter().

◆ init()

void StatHist::init ( unsigned int  capacity,
hbase_f val_in,
hbase_f val_out,
double  min,
double  max 

low-level initialize function. called by *Init high-level functions

Important restrictions on val_in and val_out functions:
  • val_in: ascending, defined on [0, oo), val_in(0) == 0;
  • val_out: x == val_out(val_in(x)) where val_in(x) is defined

In practice, the requirements are less strict, but then it gets hard to define them without math notation. val_in is applied after offseting the value but before scaling See log and linear based histograms for examples

Definition at line 28 of file StatHist.cc.

References assert, and xcalloc.

Referenced by enumInit(), and logInit().

◆ logInit()

void StatHist::logInit ( unsigned int  capacity,
double  min,
double  max 

Initialize the Histogram using a logarithmic values distribution

Definition at line 223 of file StatHist.cc.

References Math::Exp, init(), Math::Log, and Math::Null.

Referenced by newStatHist(), statCountersInitSpecial(), testStatHist::testStatHistLog(), and testStatHist::testStatHistSum().

◆ operator+=()

StatHist & StatHist::operator+= ( const StatHist B)

Import values from another histogram

: the two histograms MUST have the same capicity, min and max or an exception will be raised

Definition at line 189 of file StatHist.cc.

References assert, B, bins, capacity_, Math::Exp, i, Math::Log, log(), max_, min_, Must, and NULL.

◆ operator=()

StatHist & StatHist::operator= ( const StatHist src)

Definition at line 122 of file StatHist.h.

References bins, capacity_, max_, min_, scale_, val_in, val_out, xcalloc, and xfree.

◆ val()

double StatHist::val ( unsigned int  bin) const

obtain the output-transformed value from the specified bin

Definition at line 87 of file StatHist.cc.

References min_, scale_, and val_out.

Referenced by deltaPctile(), and dump().

Member Data Documentation

◆ bins

bins_type* StatHist::bins = nullptr

◆ capacity_

unsigned int StatHist::capacity_ = 0

◆ max_

double StatHist::max_ = 0.0

Definition at line 108 of file StatHist.h.

Referenced by operator+=(), operator=(), and InspectingStatHist::operator==().

◆ min_

double StatHist::min_ = 0.0

Definition at line 105 of file StatHist.h.

Referenced by dump(), findBin(), operator+=(), operator=(), InspectingStatHist::operator==(), and val().

◆ scale_

double StatHist::scale_ = 1.0

Definition at line 111 of file StatHist.h.

Referenced by findBin(), operator=(), InspectingStatHist::operator==(), and val().

◆ val_in

hbase_f* StatHist::val_in = nullptr

Definition at line 112 of file StatHist.h.

Referenced by findBin(), operator=(), and InspectingStatHist::operator==().

◆ val_out

hbase_f* StatHist::val_out = nullptr

Definition at line 113 of file StatHist.h.

Referenced by operator=(), InspectingStatHist::operator==(), and val().

The documentation for this class was generated from the following files:






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