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f06e48d8 | 1 | import type { IWorker } from '../worker' |
23ff945a | 2 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' |
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3 | import type { |
4 | IWorkerChoiceStrategy, | |
5 | RequiredStatistics | |
6 | } from './selection-strategies-types' | |
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7 | |
8 | /** | |
9 | * Worker virtual task timestamp. | |
10 | */ | |
78cea37e | 11 | interface WorkerVirtualTaskTimestamp { |
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12 | start: number |
13 | end: number | |
14 | } | |
15 | ||
16 | /** | |
17 | * Selects the next worker with a fair share scheduling algorithm. | |
18 | * Loosely modeled after the fair queueing algorithm: https://en.wikipedia.org/wiki/Fair_queuing. | |
19 | * | |
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20 | * @typeParam Worker - Type of worker which manages the strategy. |
21 | * @typeParam Data - Type of data sent to the worker. This can only be serializable data. | |
22 | * @typeParam Response - Type of response of execution. This can only be serializable data. | |
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23 | */ |
24 | export class FairShareWorkerChoiceStrategy< | |
f06e48d8 | 25 | Worker extends IWorker, |
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26 | Data = unknown, |
27 | Response = unknown | |
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28 | > |
29 | extends AbstractWorkerChoiceStrategy<Worker, Data, Response> | |
17393ac8 | 30 | implements IWorkerChoiceStrategy { |
afc003b2 | 31 | /** @inheritDoc */ |
ea7a90d3 | 32 | public readonly requiredStatistics: RequiredStatistics = { |
c6bd2650 | 33 | runTime: true, |
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34 | avgRunTime: true, |
35 | medRunTime: false | |
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36 | } |
37 | ||
23ff945a | 38 | /** |
f06e48d8 | 39 | * Worker last virtual task execution timestamp. |
23ff945a | 40 | */ |
ea7a90d3 | 41 | private readonly workerLastVirtualTaskTimestamp: Map< |
c923ce56 | 42 | number, |
78cea37e | 43 | WorkerVirtualTaskTimestamp |
c923ce56 | 44 | > = new Map<number, WorkerVirtualTaskTimestamp>() |
23ff945a | 45 | |
afc003b2 | 46 | /** @inheritDoc */ |
a6f7f1b4 | 47 | public reset (): boolean { |
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48 | this.workerLastVirtualTaskTimestamp.clear() |
49 | return true | |
50 | } | |
51 | ||
afc003b2 | 52 | /** @inheritDoc */ |
c923ce56 | 53 | public choose (): number { |
23ff945a | 54 | let minWorkerVirtualTaskEndTimestamp = Infinity |
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55 | let chosenWorkerNodeKey!: number |
56 | for (const [index] of this.pool.workerNodes.entries()) { | |
c923ce56 | 57 | this.computeWorkerLastVirtualTaskTimestamp(index) |
23ff945a | 58 | const workerLastVirtualTaskEndTimestamp = |
c923ce56 | 59 | this.workerLastVirtualTaskTimestamp.get(index)?.end ?? 0 |
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60 | if ( |
61 | workerLastVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp | |
62 | ) { | |
63 | minWorkerVirtualTaskEndTimestamp = workerLastVirtualTaskEndTimestamp | |
f06e48d8 | 64 | chosenWorkerNodeKey = index |
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65 | } |
66 | } | |
f06e48d8 | 67 | return chosenWorkerNodeKey |
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68 | } |
69 | ||
afc003b2 | 70 | /** @inheritDoc */ |
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71 | public remove (workerNodeKey: number): boolean { |
72 | const deleted = this.workerLastVirtualTaskTimestamp.delete(workerNodeKey) | |
97a2abc3 | 73 | for (const [key, value] of this.workerLastVirtualTaskTimestamp.entries()) { |
f06e48d8 | 74 | if (key > workerNodeKey) { |
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75 | this.workerLastVirtualTaskTimestamp.set(key - 1, value) |
76 | } | |
77 | } | |
f06e48d8 | 78 | return deleted |
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79 | } |
80 | ||
23ff945a | 81 | /** |
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82 | * Computes worker last virtual task timestamp. |
83 | * | |
f06e48d8 | 84 | * @param workerNodeKey - The worker node key. |
23ff945a | 85 | */ |
f06e48d8 | 86 | private computeWorkerLastVirtualTaskTimestamp (workerNodeKey: number): void { |
11df3590 | 87 | const workerVirtualTaskStartTimestamp = Math.max( |
3fafb1b2 | 88 | performance.now(), |
f06e48d8 | 89 | this.workerLastVirtualTaskTimestamp.get(workerNodeKey)?.end ?? -Infinity |
11df3590 | 90 | ) |
f06e48d8 | 91 | this.workerLastVirtualTaskTimestamp.set(workerNodeKey, { |
11df3590 | 92 | start: workerVirtualTaskStartTimestamp, |
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93 | end: |
94 | workerVirtualTaskStartTimestamp + | |
f06e48d8 | 95 | (this.pool.workerNodes[workerNodeKey].tasksUsage.avgRunTime ?? 0) |
11df3590 | 96 | }) |
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97 | } |
98 | } |