benchmarks/worker-selection/round-robin.js

   1 const Benchmark = require('benny')
   2
   3 function generateWorkersArray (numberOfWorkers) {
   4   return [...Array(numberOfWorkers).keys()]
   5 }
   6
   7 const workers = generateWorkersArray(60)
   8
   9 let nextWorkerIndex
  10
  11 function roundRobinTernaryOffByOne () {
  12   nextWorkerIndex =
  13     workers.length - 1 === nextWorkerIndex ? 0 : nextWorkerIndex + 1
  14   return workers[nextWorkerIndex]
  15 }
  16
  17 function roundRobinTernaryWithNegation () {
  18   nextWorkerIndex =
  19     !nextWorkerIndex || workers.length - 1 === nextWorkerIndex
  20       ? 0
  21       : nextWorkerIndex + 1
  22   return workers[nextWorkerIndex]
  23 }
  24
  25 function roundRobinTernaryWithPreChoosing () {
  26   const chosenWorker = workers[nextWorkerIndex]
  27   nextWorkerIndex =
  28     workers.length - 1 === nextWorkerIndex ? 0 : nextWorkerIndex + 1
  29   return chosenWorker
  30 }
  31
  32 function roundRobinIncrementModulo () {
  33   const chosenWorker = workers[nextWorkerIndex]
  34   nextWorkerIndex++
  35   nextWorkerIndex %= workers.length
  36   return chosenWorker
  37 }
  38
  39 Benchmark.suite(
  40   'Less recently used',
  41   Benchmark.add('Ternary off by one', () => {
  42     nextWorkerIndex = 0
  43     roundRobinTernaryOffByOne()
  44   }),
  45   Benchmark.add('Ternary with negation', () => {
  46     nextWorkerIndex = 0
  47     roundRobinTernaryWithNegation()
  48   }),
  49   Benchmark.add('Ternary with pre-choosing', () => {
  50     nextWorkerIndex = 0
  51     roundRobinTernaryWithPreChoosing()
  52   }),
  53   Benchmark.add('Increment+Modulo', () => {
  54     nextWorkerIndex = 0
  55     roundRobinIncrementModulo()
  56   }),
  57   Benchmark.cycle(),
  58   Benchmark.complete()
  59 )