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