busy-wait.js

   1 const Benchmark = require('benchmark')
   2 const { LIST_FORMATTER, sleep } = require('./benchmark-utils')
   3
   4 const suite = new Benchmark.Suite()
   5
   6 const timeout = 2000
   7
   8 /**
   9  * @param timeoutMs
  10  */
  11 function dummyTimeoutBusyWait (timeoutMs) {
  12   const timeoutTimestampMs = Date.now() + timeoutMs
  13   do {} while (Date.now() < timeoutTimestampMs)
  14 }
  15
  16 /**
  17  * @param timeoutMs
  18  * @param intervalMs
  19  */
  20 async function divideAndConquerTimeoutBusyWait (timeoutMs, intervalMs = 200) {
  21   const tries = Math.round(timeoutMs / intervalMs)
  22   let count = 0
  23   do {
  24     count++
  25     await sleep(intervalMs)
  26   } while (count <= tries)
  27 }
  28
  29 /**
  30  * @param timeoutMs
  31  * @param intervalMs
  32  */
  33 function setIntervalTimeoutBusyWait (timeoutMs, intervalMs = 200) {
  34   const tries = Math.round(timeoutMs / intervalMs)
  35   let count = 0
  36   const triesSetInterval = setInterval(() => {
  37     count++
  38     if (count === tries) {
  39       clearInterval(triesSetInterval)
  40     }
  41   }, intervalMs)
  42 }
  43
  44 suite
  45   .add('dummyTimeoutBusyWait', function () {
  46     dummyTimeoutBusyWait(timeout)
  47   })
  48   .add('divideAndConquerTimeoutBusyWait', async function () {
  49     await divideAndConquerTimeoutBusyWait(timeout)
  50   })
  51   .add('setIntervalTimeoutBusyWait', function () {
  52     setIntervalTimeoutBusyWait(timeout)
  53   })
  54   .on('cycle', function (event) {
  55     console.log(event.target.toString())
  56   })
  57   .on('complete', function () {
  58     console.log(
  59       'Fastest is ' + LIST_FORMATTER.format(this.filter('fastest').map('name'))
  60     )
  61     // eslint-disable-next-line no-process-exit
  62     process.exit()
  63   })
  64   .run()