busy-wait.mjs

   1 import Benchmark from 'benny'
   2 import { sleep } from './benchmark-utils.mjs'
   3
   4 const timeout = 2000
   5 const interval = 1000
   6
   7 /**
   8  * @param timeoutMs
   9  */
  10 function dummyTimeoutBusyWait (timeoutMs) {
  11   const timeoutTimestampMs = performance.now() + timeoutMs
  12   // eslint-disable-next-line no-empty
  13   do {} while (performance.now() < timeoutTimestampMs)
  14 }
  15
  16 /**
  17  * @param timeoutMs
  18  * @param intervalMs
  19  */
  20 async function sleepTimeoutBusyWait (timeoutMs, intervalMs = interval) {
  21   const timeoutTimestampMs = performance.now() + timeoutMs
  22   do {
  23     await sleep(intervalMs)
  24   } while (performance.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 async function setIntervalTimeoutBusyWait (timeoutMs, intervalMs = interval) {
  48   return await new Promise(resolve => {
  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         return resolve()
  56       }
  57     }, intervalMs)
  58   })
  59 }
  60
  61 Benchmark.suite(
  62   'Busy wait',
  63   Benchmark.add('dummyTimeoutBusyWait', () => {
  64     dummyTimeoutBusyWait(timeout)
  65   }),
  66   Benchmark.add('sleepTimeoutBusyWait', async () => {
  67     await sleepTimeoutBusyWait(timeout)
  68   }),
  69   Benchmark.add('divideAndConquerTimeoutBusyWait', async () => {
  70     await divideAndConquerTimeoutBusyWait(timeout)
  71   }),
  72   Benchmark.add('setIntervalTimeoutBusyWait', async () => {
  73     await setIntervalTimeoutBusyWait(timeout)
  74   }),
  75   Benchmark.cycle(),
  76   Benchmark.complete(),
  77   Benchmark.save({ file: 'busy-wait', format: 'json', details: true }),
  78   Benchmark.save({ file: 'busy-wait', format: 'chart.html', details: true }),
  79   Benchmark.save({ file: 'busy-wait', format: 'table.html', details: true })
  80 ).catch(err => {
  81   console.error(err)
  82 })