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 const interval = 1000
   8
   9 /**
  10  * @param timeoutMs
  11  */
  12 function dummyTimeoutBusyWait (timeoutMs) {
  13   const timeoutTimestampMs = Date.now() + timeoutMs
  14   // eslint-disable-next-line no-empty
  15   do {} while (Date.now() < timeoutTimestampMs)
  16 }
  17
  18 /**
  19  * @param timeoutMs
  20  */
  21 async function sleepTimeoutBusyWait (timeoutMs) {
  22   const timeoutTimestampMs = Date.now() + timeoutMs
  23   do {
  24     await sleep(interval)
  25   } while (Date.now() < timeoutTimestampMs)
  26 }
  27
  28 /**
  29  * @param timeoutMs
  30  * @param intervalMs
  31  */
  32 async function divideAndConquerTimeoutBusyWait (
  33   timeoutMs,
  34   intervalMs = interval
  35 ) {
  36   const tries = Math.round(timeoutMs / intervalMs)
  37   let count = 0
  38   do {
  39     count++
  40     await sleep(intervalMs)
  41   } while (count <= tries)
  42 }
  43
  44 /**
  45  * @param timeoutMs
  46  * @param intervalMs
  47  */
  48 function setIntervalTimeoutBusyWait (timeoutMs, intervalMs = interval) {
  49   const tries = Math.round(timeoutMs / intervalMs)
  50   let count = 0
  51   const triesSetInterval = setInterval(() => {
  52     count++
  53     if (count === tries) {
  54       clearInterval(triesSetInterval)
  55     }
  56   }, intervalMs)
  57 }
  58
  59 suite
  60   .add('dummyTimeoutBusyWait', () => {
  61     dummyTimeoutBusyWait(timeout)
  62   })
  63   .add('sleepTimeoutBusyWait', async () => {
  64     await sleepTimeoutBusyWait(timeout)
  65   })
  66   .add('divideAndConquerTimeoutBusyWait', async () => {
  67     await divideAndConquerTimeoutBusyWait(timeout)
  68   })
  69   .add('setIntervalTimeoutBusyWait', () => {
  70     setIntervalTimeoutBusyWait(timeout)
  71   })
  72   .on('cycle', event => {
  73     console.log(event.target.toString())
  74   })
  75   .on('complete', function () {
  76     console.log(
  77       'Fastest is ' + LIST_FORMATTER.format(this.filter('fastest').map('name'))
  78     )
  79     // eslint-disable-next-line n/no-process-exit
  80     process.exit()
  81   })
  82   .run()