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