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1 | import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils' |
2 | import type { IPool } from '../pool' | |
f06e48d8 | 3 | import type { IWorker } from '../worker' |
23ff945a | 4 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' |
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5 | import type { |
6 | IWorkerChoiceStrategy, | |
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7 | RequiredStatistics, |
8 | WorkerChoiceStrategyOptions | |
bf90656c | 9 | } from './selection-strategies-types' |
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10 | |
11 | /** | |
12 | * Worker virtual task timestamp. | |
13 | */ | |
78cea37e | 14 | interface WorkerVirtualTaskTimestamp { |
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15 | start: number |
16 | end: number | |
17 | } | |
18 | ||
19 | /** | |
20 | * Selects the next worker with a fair share scheduling algorithm. | |
21 | * Loosely modeled after the fair queueing algorithm: https://en.wikipedia.org/wiki/Fair_queuing. | |
22 | * | |
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23 | * @typeParam Worker - Type of worker which manages the strategy. |
24 | * @typeParam Data - Type of data sent to the worker. This can only be serializable data. | |
02706357 | 25 | * @typeParam Response - Type of execution response. This can only be serializable data. |
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26 | */ |
27 | export class FairShareWorkerChoiceStrategy< | |
f06e48d8 | 28 | Worker extends IWorker, |
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29 | Data = unknown, |
30 | Response = unknown | |
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31 | > |
32 | extends AbstractWorkerChoiceStrategy<Worker, Data, Response> | |
17393ac8 | 33 | implements IWorkerChoiceStrategy { |
afc003b2 | 34 | /** @inheritDoc */ |
ea7a90d3 | 35 | public readonly requiredStatistics: RequiredStatistics = { |
c6bd2650 | 36 | runTime: true, |
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37 | avgRunTime: true, |
38 | medRunTime: false | |
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39 | } |
40 | ||
23ff945a | 41 | /** |
08f3f44c | 42 | * Workers' virtual task execution timestamp. |
23ff945a | 43 | */ |
08f3f44c | 44 | private workersVirtualTaskTimestamp: WorkerVirtualTaskTimestamp[] = [] |
23ff945a | 45 | |
2fc5cae3 JB |
46 | /** @inheritDoc */ |
47 | public constructor ( | |
48 | pool: IPool<Worker, Data, Response>, | |
49 | opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS | |
50 | ) { | |
51 | super(pool, opts) | |
a20f0ba5 | 52 | this.checkOptions(this.opts) |
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53 | } |
54 | ||
afc003b2 | 55 | /** @inheritDoc */ |
a6f7f1b4 | 56 | public reset (): boolean { |
08f3f44c | 57 | this.workersVirtualTaskTimestamp = [] |
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58 | return true |
59 | } | |
60 | ||
afc003b2 | 61 | /** @inheritDoc */ |
c923ce56 | 62 | public choose (): number { |
23ff945a | 63 | let minWorkerVirtualTaskEndTimestamp = Infinity |
f06e48d8 | 64 | let chosenWorkerNodeKey!: number |
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65 | for (const [workerNodeKey] of this.pool.workerNodes.entries()) { |
66 | this.computeWorkerVirtualTaskTimestamp(workerNodeKey) | |
23ff945a | 67 | const workerLastVirtualTaskEndTimestamp = |
08f3f44c | 68 | this.workersVirtualTaskTimestamp[workerNodeKey]?.end ?? 0 |
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69 | if ( |
70 | workerLastVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp | |
71 | ) { | |
72 | minWorkerVirtualTaskEndTimestamp = workerLastVirtualTaskEndTimestamp | |
08f3f44c | 73 | chosenWorkerNodeKey = workerNodeKey |
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74 | } |
75 | } | |
f06e48d8 | 76 | return chosenWorkerNodeKey |
23ff945a JB |
77 | } |
78 | ||
afc003b2 | 79 | /** @inheritDoc */ |
f06e48d8 | 80 | public remove (workerNodeKey: number): boolean { |
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81 | this.workersVirtualTaskTimestamp.splice(workerNodeKey, 1) |
82 | return true | |
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83 | } |
84 | ||
23ff945a | 85 | /** |
08f3f44c | 86 | * Computes worker virtual task timestamp. |
11df3590 | 87 | * |
f06e48d8 | 88 | * @param workerNodeKey - The worker node key. |
23ff945a | 89 | */ |
08f3f44c | 90 | private computeWorkerVirtualTaskTimestamp (workerNodeKey: number): void { |
11df3590 | 91 | const workerVirtualTaskStartTimestamp = Math.max( |
3fafb1b2 | 92 | performance.now(), |
08f3f44c | 93 | this.workersVirtualTaskTimestamp[workerNodeKey]?.end ?? -Infinity |
11df3590 | 94 | ) |
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95 | const workerVirtualTaskTRunTime = this.requiredStatistics.medRunTime |
96 | ? this.pool.workerNodes[workerNodeKey].tasksUsage.medRunTime | |
97 | : this.pool.workerNodes[workerNodeKey].tasksUsage.avgRunTime | |
08f3f44c | 98 | this.workersVirtualTaskTimestamp[workerNodeKey] = { |
11df3590 | 99 | start: workerVirtualTaskStartTimestamp, |
da309861 | 100 | end: workerVirtualTaskStartTimestamp + (workerVirtualTaskTRunTime ?? 0) |
08f3f44c | 101 | } |
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102 | } |
103 | } |