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  * @param intervalMs
  19  */
  20 async function sleepTimeoutBusyWait (timeoutMs, intervalMs = interval) {
  21   const timeoutTimestampMs = Date.now() + timeoutMs
  22   do {
  23     await sleep(intervalMs)
  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 async 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       return Promise.resolve()
  55     }
  56   }, intervalMs)
  57 }
  58
  59 Benchmark.suite(
  60   'Busy wait',
  61   Benchmark.add('dummyTimeoutBusyWait', () => {
  62     dummyTimeoutBusyWait(timeout)
  63   }),
  64   Benchmark.add('sleepTimeoutBusyWait', async () => {
  65     await sleepTimeoutBusyWait(timeout)
  66   }),
  67   Benchmark.add('divideAndConquerTimeoutBusyWait', async () => {
  68     await divideAndConquerTimeoutBusyWait(timeout)
  69   }),
  70   Benchmark.add('setIntervalTimeoutBusyWait', async () => {
  71     await setIntervalTimeoutBusyWait(timeout)
  72   }),
  73   Benchmark.cycle(),
  74   Benchmark.complete(),
  75   Benchmark.save({ file: 'busy-wait', format: 'json', details: true }),
  76   Benchmark.save({ file: 'busy-wait', format: 'chart.html', details: true }),
  77   Benchmark.save({ file: 'busy-wait', format: 'table.html', details: true })
  78 )