| 1 | import { bench, group, run } from 'tatami-ng' |
| 2 | |
| 3 | /** |
| 4 | * |
| 5 | * @param numberOfWorkers |
| 6 | * @returns |
| 7 | */ |
| 8 | function generateWorkersArray (numberOfWorkers) { |
| 9 | return [...Array(numberOfWorkers).keys()] |
| 10 | } |
| 11 | |
| 12 | const workers = generateWorkersArray(60) |
| 13 | |
| 14 | let nextWorkerIndex |
| 15 | |
| 16 | /** |
| 17 | * @returns |
| 18 | */ |
| 19 | function roundRobinTernaryOffByOne () { |
| 20 | nextWorkerIndex = |
| 21 | workers.length - 1 === nextWorkerIndex ? 0 : nextWorkerIndex + 1 |
| 22 | return workers[nextWorkerIndex] |
| 23 | } |
| 24 | |
| 25 | /** |
| 26 | * @returns |
| 27 | */ |
| 28 | function roundRobinTernaryWithNegation () { |
| 29 | nextWorkerIndex = |
| 30 | !nextWorkerIndex || workers.length - 1 === nextWorkerIndex |
| 31 | ? 0 |
| 32 | : nextWorkerIndex + 1 |
| 33 | return workers[nextWorkerIndex] |
| 34 | } |
| 35 | |
| 36 | /** |
| 37 | * @returns |
| 38 | */ |
| 39 | function roundRobinTernaryWithPreChoosing () { |
| 40 | const chosenWorker = workers[nextWorkerIndex] |
| 41 | nextWorkerIndex = |
| 42 | workers.length - 1 === nextWorkerIndex ? 0 : nextWorkerIndex + 1 |
| 43 | return chosenWorker |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * @returns |
| 48 | */ |
| 49 | function roundRobinIncrementModulo () { |
| 50 | const chosenWorker = workers[nextWorkerIndex] |
| 51 | nextWorkerIndex++ |
| 52 | nextWorkerIndex %= workers.length |
| 53 | return chosenWorker |
| 54 | } |
| 55 | |
| 56 | group('Round robin tasks distribution', () => { |
| 57 | bench('Ternary off by one', () => { |
| 58 | nextWorkerIndex = 0 |
| 59 | roundRobinTernaryOffByOne() |
| 60 | }) |
| 61 | bench('Ternary with negation', () => { |
| 62 | nextWorkerIndex = 0 |
| 63 | roundRobinTernaryWithNegation() |
| 64 | }) |
| 65 | bench('Ternary with pre-choosing', () => { |
| 66 | nextWorkerIndex = 0 |
| 67 | roundRobinTernaryWithPreChoosing() |
| 68 | }) |
| 69 | bench('Increment+Modulo', () => { |
| 70 | nextWorkerIndex = 0 |
| 71 | roundRobinIncrementModulo() |
| 72 | }) |
| 73 | }) |
| 74 | |
| 75 | await run({ units: true }) |