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fc3e6586 | 1 | import { cpus } from 'node:os' |
b3432a63 | 2 | import type { IPoolInternal } from '../pool-internal' |
ea7a90d3 | 3 | import type { IPoolWorker } from '../pool-worker' |
b3432a63 | 4 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' |
10fcfaf4 | 5 | import type { RequiredStatistics } from './selection-strategies-types' |
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6 | |
7 | /** | |
23135a89 | 8 | * Virtual task runtime. |
b3432a63 | 9 | */ |
78cea37e | 10 | interface TaskRunTime { |
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11 | weight: number |
12 | runTime: number | |
13 | } | |
14 | ||
15 | /** | |
16 | * Selects the next worker with a weighted round robin scheduling algorithm. | |
17 | * Loosely modeled after the weighted round robin queueing algorithm: https://en.wikipedia.org/wiki/Weighted_round_robin. | |
18 | * | |
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19 | * @typeParam Worker - Type of worker which manages the strategy. |
20 | * @typeParam Data - Type of data sent to the worker. This can only be serializable data. | |
21 | * @typeParam Response - Type of response of execution. This can only be serializable data. | |
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22 | */ |
23 | export class WeightedRoundRobinWorkerChoiceStrategy< | |
ea7a90d3 | 24 | Worker extends IPoolWorker, |
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25 | Data, |
26 | Response | |
27 | > extends AbstractWorkerChoiceStrategy<Worker, Data, Response> { | |
38e795c1 | 28 | /** {@inheritDoc} */ |
ea7a90d3 | 29 | public readonly requiredStatistics: RequiredStatistics = { |
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30 | runTime: true |
31 | } | |
32 | ||
b3432a63 | 33 | /** |
ffcbbad8 | 34 | * Worker id where the current task will be submitted. |
b3432a63 | 35 | */ |
ffcbbad8 | 36 | private currentWorkerId: number = 0 |
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37 | /** |
38 | * Default worker weight. | |
39 | */ | |
777af0ac | 40 | private readonly defaultWorkerWeight: number |
b3432a63 | 41 | /** |
2377984d | 42 | * Per worker virtual task runtime map. |
b3432a63 | 43 | */ |
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44 | private readonly workersTaskRunTime: Map<number, TaskRunTime> = new Map< |
45 | number, | |
78cea37e | 46 | TaskRunTime |
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47 | >() |
48 | ||
49 | /** | |
23ff945a | 50 | * Constructs a worker choice strategy that selects with a weighted round robin scheduling algorithm. |
b3432a63 | 51 | * |
38e795c1 | 52 | * @param pool - The pool instance. |
b3432a63 JB |
53 | */ |
54 | public constructor (pool: IPoolInternal<Worker, Data, Response>) { | |
55 | super(pool) | |
56 | this.defaultWorkerWeight = this.computeWorkerWeight() | |
2377984d | 57 | this.initWorkersTaskRunTime() |
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58 | } |
59 | ||
38e795c1 | 60 | /** {@inheritDoc} */ |
a6f7f1b4 | 61 | public reset (): boolean { |
ffcbbad8 | 62 | this.currentWorkerId = 0 |
ea7a90d3 JB |
63 | this.workersTaskRunTime.clear() |
64 | this.initWorkersTaskRunTime() | |
65 | return true | |
66 | } | |
67 | ||
38e795c1 | 68 | /** {@inheritDoc} */ |
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69 | public choose (): number { |
70 | const chosenWorkerKey = this.currentWorkerId | |
71 | if (this.isDynamicPool && !this.workersTaskRunTime.has(chosenWorkerKey)) { | |
72 | this.initWorkerTaskRunTime(chosenWorkerKey) | |
b3432a63 | 73 | } |
d8a610ca | 74 | const workerTaskRunTime = |
c923ce56 | 75 | this.workersTaskRunTime.get(chosenWorkerKey)?.runTime ?? 0 |
b3432a63 | 76 | const workerTaskWeight = |
c923ce56 | 77 | this.workersTaskRunTime.get(chosenWorkerKey)?.weight ?? |
b3432a63 | 78 | this.defaultWorkerWeight |
553ad720 | 79 | if (workerTaskRunTime < workerTaskWeight) { |
2377984d | 80 | this.setWorkerTaskRunTime( |
c923ce56 | 81 | chosenWorkerKey, |
2377984d | 82 | workerTaskWeight, |
553ad720 | 83 | workerTaskRunTime + |
c923ce56 | 84 | (this.getWorkerVirtualTaskRunTime(chosenWorkerKey) ?? 0) |
2377984d | 85 | ) |
b3432a63 | 86 | } else { |
ffcbbad8 | 87 | this.currentWorkerId = |
e65c6cd9 | 88 | this.currentWorkerId === this.pool.workers.length - 1 |
b3432a63 | 89 | ? 0 |
ffcbbad8 | 90 | : this.currentWorkerId + 1 |
c923ce56 | 91 | this.setWorkerTaskRunTime(this.currentWorkerId, workerTaskWeight, 0) |
b3432a63 | 92 | } |
c923ce56 | 93 | return chosenWorkerKey |
b3432a63 JB |
94 | } |
95 | ||
2377984d | 96 | private initWorkersTaskRunTime (): void { |
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97 | for (const [index] of this.pool.workers.entries()) { |
98 | this.initWorkerTaskRunTime(index) | |
2377984d JB |
99 | } |
100 | } | |
101 | ||
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102 | private initWorkerTaskRunTime (workerKey: number): void { |
103 | this.setWorkerTaskRunTime(workerKey, this.defaultWorkerWeight, 0) | |
2377984d JB |
104 | } |
105 | ||
106 | private setWorkerTaskRunTime ( | |
c923ce56 | 107 | workerKey: number, |
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108 | weight: number, |
109 | runTime: number | |
110 | ): void { | |
c923ce56 | 111 | this.workersTaskRunTime.set(workerKey, { |
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112 | weight, |
113 | runTime | |
114 | }) | |
115 | } | |
116 | ||
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117 | private getWorkerVirtualTaskRunTime (workerKey: number): number { |
118 | return this.pool.workers[workerKey].tasksUsage.avgRunTime | |
2377984d JB |
119 | } |
120 | ||
121 | private computeWorkerWeight (): number { | |
b3432a63 | 122 | let cpusCycleTimeWeight = 0 |
a59e741b | 123 | for (const cpu of cpus()) { |
b3432a63 | 124 | // CPU estimated cycle time |
d8a610ca JB |
125 | const numberOfDigits = cpu.speed.toString().length - 1 |
126 | const cpuCycleTime = 1 / (cpu.speed / Math.pow(10, numberOfDigits)) | |
127 | cpusCycleTimeWeight += cpuCycleTime * Math.pow(10, numberOfDigits) | |
b3432a63 | 128 | } |
7b0d35b8 | 129 | return Math.round(cpusCycleTimeWeight / cpus().length) |
b3432a63 | 130 | } |
b3432a63 | 131 | } |