stats

Documentation

Index

• type Histogram
  • func NewHistogram(opts HistogramOptions) *Histogram
  • func (h *Histogram) Add(value int64) error
  • func (h *Histogram) Clear()
  • func (h *Histogram) Merge(h2 *Histogram)
  • func (h *Histogram) Opts() HistogramOptions
  • func (h *Histogram) Print(w io.Writer)
  • func (h *Histogram) String() string
• type HistogramBucket
• type HistogramOptions

Types

type Histogram

type Histogram struct {
	// Count is the total number of values added to the histogram.
	Count int64
	// Sum is the sum of all the values added to the histogram.
	Sum int64
	// SumOfSquares is the sum of squares of all values.
	SumOfSquares int64
	// Min is the minimum of all the values added to the histogram.
	Min int64
	// Max is the maximum of all the values added to the histogram.
	Max int64
	// Buckets contains all the buckets of the histogram.
	Buckets []HistogramBucket
	// contains filtered or unexported fields
}

Histogram accumulates values in the form of a histogram with exponentially increased bucket sizes.

func NewHistogram

func NewHistogram(opts HistogramOptions) *Histogram

NewHistogram returns a pointer to a new Histogram object that was created with the provided options.

func (*Histogram) Add

func (h *Histogram) Add(value int64) error

Add adds a value to the histogram.

func (*Histogram) Clear

func (h *Histogram) Clear()

Clear resets all the content of histogram.

func (*Histogram) Merge

func (h *Histogram) Merge(h2 *Histogram)

Merge takes another histogram h2, and merges its content into h. The two histograms must be created by equivalent HistogramOptions.

func (*Histogram) Opts

func (h *Histogram) Opts() HistogramOptions

Opts returns a copy of the options used to create the Histogram.

func (*Histogram) Print

func (h *Histogram) Print(w io.Writer)

Print writes textual output of the histogram values.

func (*Histogram) String

func (h *Histogram) String() string

String returns the textual output of the histogram values as string.

type HistogramBucket

type HistogramBucket struct {
	// LowBound is the lower bound of the bucket.
	LowBound float64
	// Count is the number of values in the bucket.
	Count int64
}

HistogramBucket represents one histogram bucket.

type HistogramOptions

type HistogramOptions struct {
	// NumBuckets is the number of buckets.
	NumBuckets int
	// GrowthFactor is the growth factor of the buckets. A value of 0.1
	// indicates that bucket N+1 will be 10% larger than bucket N.
	GrowthFactor float64
	// BaseBucketSize is the size of the first bucket.
	BaseBucketSize float64
	// MinValue is the lower bound of the first bucket.
	MinValue int64
}

HistogramOptions contains the parameters that define the histogram's buckets. The first bucket of the created histogram (with index 0) contains [min, min+n) where n = BaseBucketSize, min = MinValue. Bucket i (i>=1) contains [min + n * m^(i-1), min + n * m^i), where m = 1+GrowthFactor. The type of the values is int64.