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  3. FHistogram

FHistogram

Fairly generic histogram for values that have natural lower bound and possibly no upper bound, e.g., frame time

API > API/Runtime > API/Runtime/Core > API/Runtime/Core/ProfilingDebugging

References

   
Module Core
Header /Engine/Source/Runtime/Core/Public/ProfilingDebugging/Histogram.h
Include #include "ProfilingDebugging/Histogram.h"

Syntax

struct FHistogram

Remarks

Fairly generic histogram for values that have natural lower bound and possibly no upper bound, e.g., frame time

Variables

  Type Name Description
Protected variable TArray< FBin > Bins Bins themselves, should be continous in terms of [MinValue; UpperBound) and sorted ascending by MinValue.
Protected variable int64 CountOfAllMeasures  
Protected variable friend FHistogramBuilder This is exposed as a clean way to build bins while enforcing the condition mentioned above
Protected variable double MaximalMeasurement  
Protected variable double MinimalMeasurement  
Protected variable double SumOfAllMeasures Quick stats for all bins

Functions

  Type Name Description
Public function void

AddMeasurement ( double Value
)

 Adds an observed measurement.
Public function void

AddMeasurement ( double ValueForBinning,
double MeasurementValue
)

 Adds an observed measurement (with a different thresholding key than the measurement, e.g., when accumulating time spent in a chart keyed on framerate).
Public function Static FString

DefaultConvertBinToLabel ( double MinValue,
double UpperBound
)

 Default stringifier for bins for use with DumpToJsonString.
Public function Const FString

DumpToJsonString ( TFunctionRef< FString(double, double)> ConvertBinToLabel
)

 Returns a string in a Json format: [{"Bin":"BinName","Count":Count,"Sum":Sum},...].
Public function Const FString Same as DumpToJsonString but uses a DefaultConvertBinToLabel.
Public function Const FString

DumpToJsonString2 ( TFunctionRef< FString(double, double)> ConvertBinToLabel
)

 Returns a string in a Json format: [{"BinName":{"Count":Count,"Sum":Sum}},...].
Public function Const FString Same as DumpToJsonString2 but uses a DefaultConvertBinToLabel.
Public function void

DumpToLog ( const FString& HistogramName
)

 Prints histogram contents to the log.
Public function Const double Returns the average of all measurements (essentially a shortcut for Sum/Count).
Public function Const double

GetBinLowerBound ( int IdxBin
)

 Gets lower bound of the bin, i.e. minimum value that goes into it.
Public function Const int32

GetBinObservationsCount ( int IdxBin
)

 Gets number of observations in the bin.
Public function Const double

GetBinObservationsSum ( int IdxBin
)

 Gets sum of observations in the bin.
Public function Const double

GetBinUpperBound ( int IdxBin
)

 Gets upper bound of the bin, i.e. first value that does not go into it.
Public function Const double Returns the maximum of all measurements.
Public function Const double Returns the minimum of all measurements.
Public function Const int32 Gets number of bins.
Public function Const int64 Returns the sum of all counts (the number of recorded measurements)
Public function Const double Returns the sum of all measurements
Public function void

InitFromArray ( std::initializer_list< double > Thresholds
)

 Inits histogram with the specified bin boundaries, with the final bucket extending to infinity (e.g., passing in 0,5 creates a [0..5) bucket and a [5..infinity) bucket)
Public function void

InitFromArray ( TArrayView< const double > Thresholds
)

 Inits histogram with the specified bin boundaries, with the final bucket extending to infinity (e.g., passing in 0,5 creates a [0..5) bucket and a [5..infinity) bucket)
Public function void Inits histogram to mimic our existing hitch buckets
Public function void

InitLinear ( double MinTime,
double MaxTime,
double BinSize
)

 Inits histogram with linear, equally sized bins
Public function void

Reset ()

 Resets measurements, without resetting the configured bins.

Operators

  Type Name Description
Public function Const FHistogram

operator- ( const FHistogram& Other
)

  
Public function Const FHistogram

operator+ ( const FHistogram& Other
)

  
Public function FHistogram &

operator+= ( const FHistogram& Other
)

  

Classes

  Type Name Description
Protected struct FBin Bin  

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