Hdr-histogram-percentiles-obj NPM

hdr-histogram-percentiles-obj

Install

npm install --save hdr-histogram-percentiles-obj

Usage

const histPercentileObj = require('hdr-histogram-percentiles-obj')
const Histogram = require('hdr-histogram-js')

const histogram = hdr.build({
  lowestDiscernibleValue: 1,
  highestTrackableValue: 100
})
const total = 0
// record some histogram data...
// total++...

const result = histPercentileObj.histAsObj(histogram, total)
const resultWithPercentiles = histPercentileObj.addPercentiles(histogram, histPercentileObj.histAsObj(histogram, total))
histPercentileObj.percentiles.forEach((p) => {
  const key = `p${p}`.replace('.', '_')
  console.log(`${p}%`, resultWithPercentiles[key])
})

API

hdr-histogram-percentiles-obj has two utility functions to use

histAsObj(histogram, total)

histogram: A hdr-histogram-js object you want to get some values from in a js object
total: the total amount recorded by the histogram, optional

Returns a json object with the min, max, average (mean) and stddev

addPercentiles(histogram, histAsObjResult)

histogram: A hdr-histogram-js object you want to retrieve the percentiles from
histAsObjResult: the result returned when histAsObj is called on some hdr-histogram-js object

Returns the histAsObjResult with the percentiles properties added. Percentile properties are named pNN_DD, for the NN.DD% percentile. Eg., the 99th percentile is p99, while the 99.99th percentile is p99_99.