busy-wait.js

   1 const Benchmark = require('benny')
   2 const { sleep } = require('./benchmark-utils')
   3
   4 const timeout = 2000
   5 const interval = 1000
   6
   7 /**
   8  * @param timeoutMs
   9  */
  10 function dummyTimeoutBusyWait (timeoutMs) {
  11   const timeoutTimestampMs = Date.now() + timeoutMs
  12   // eslint-disable-next-line no-empty
  13   do {} while (Date.now() < timeoutTimestampMs)
  14 }
  15
  16 /**
  17  * @param timeoutMs
  18  */
  19 async function sleepTimeoutBusyWait (timeoutMs) {
  20   const timeoutTimestampMs = Date.now() + timeoutMs
  21   do {
  22     await sleep(interval)
  23   } while (Date.now() < timeoutTimestampMs)
  24 }
  25
  26 /**
  27  * @param timeoutMs
  28  * @param intervalMs
  29  */
  30 async function divideAndConquerTimeoutBusyWait (
  31   timeoutMs,
  32   intervalMs = interval
  33 ) {
  34   const tries = Math.round(timeoutMs / intervalMs)
  35   let count = 0
  36   do {
  37     count++
  38     await sleep(intervalMs)
  39   } while (count <= tries)
  40 }
  41
  42 /**
  43  * @param timeoutMs
  44  * @param intervalMs
  45  */
  46 function setIntervalTimeoutBusyWait (timeoutMs, intervalMs = interval) {
  47   const tries = Math.round(timeoutMs / intervalMs)
  48   let count = 0
  49   const triesSetInterval = setInterval(() => {
  50     count++
  51     if (count === tries) {
  52       clearInterval(triesSetInterval)
  53     }
  54   }, intervalMs)
  55 }
  56
  57 Benchmark.suite(
  58   'Busy wait',
  59   Benchmark.add('dummyTimeoutBusyWait', () => {
  60     dummyTimeoutBusyWait(timeout)
  61   }),
  62   Benchmark.add('sleepTimeoutBusyWait', async () => {
  63     await sleepTimeoutBusyWait(timeout)
  64   }),
  65   Benchmark.add('divideAndConquerTimeoutBusyWait', async () => {
  66     await divideAndConquerTimeoutBusyWait(timeout)
  67   }),
  68   Benchmark.add('setIntervalTimeoutBusyWait', () => {
  69     setIntervalTimeoutBusyWait(timeout)
  70   }),
  71   Benchmark.cycle(),
  72   Benchmark.complete(),
  73   Benchmark.save({ file: 'busy-wait', format: 'json', details: true }),
  74   Benchmark.save({ file: 'busy-wait', format: 'chart.html', details: true }),
  75   Benchmark.save({ file: 'busy-wait', format: 'table.html', details: true })
  76 )