| 1 | import { cpus } from 'node:os' |
| 2 | |
| 3 | import type { IPool } from '../pool.js' |
| 4 | import type { IWorker } from '../worker.js' |
| 5 | import { FairShareWorkerChoiceStrategy } from './fair-share-worker-choice-strategy.js' |
| 6 | import { InterleavedWeightedRoundRobinWorkerChoiceStrategy } from './interleaved-weighted-round-robin-worker-choice-strategy.js' |
| 7 | import { LeastBusyWorkerChoiceStrategy } from './least-busy-worker-choice-strategy.js' |
| 8 | import { LeastEluWorkerChoiceStrategy } from './least-elu-worker-choice-strategy.js' |
| 9 | import { LeastUsedWorkerChoiceStrategy } from './least-used-worker-choice-strategy.js' |
| 10 | import { RoundRobinWorkerChoiceStrategy } from './round-robin-worker-choice-strategy.js' |
| 11 | import { |
| 12 | type IWorkerChoiceStrategy, |
| 13 | WorkerChoiceStrategies, |
| 14 | type WorkerChoiceStrategy, |
| 15 | type WorkerChoiceStrategyOptions |
| 16 | } from './selection-strategies-types.js' |
| 17 | import { WeightedRoundRobinWorkerChoiceStrategy } from './weighted-round-robin-worker-choice-strategy.js' |
| 18 | import type { WorkerChoiceStrategiesContext } from './worker-choice-strategies-context.js' |
| 19 | |
| 20 | const estimatedCpuSpeed = (): number => { |
| 21 | const runs = 150000000 |
| 22 | const begin = performance.now() |
| 23 | // eslint-disable-next-line no-empty |
| 24 | for (let i = runs; i > 0; i--) {} |
| 25 | const end = performance.now() |
| 26 | const duration = end - begin |
| 27 | return Math.trunc(runs / duration / 1000) // in MHz |
| 28 | } |
| 29 | |
| 30 | const getDefaultWorkerWeight = (): number => { |
| 31 | const currentCpus = cpus() |
| 32 | let estCpuSpeed: number | undefined |
| 33 | // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition |
| 34 | if (currentCpus.every(cpu => cpu.speed == null || cpu.speed === 0)) { |
| 35 | estCpuSpeed = estimatedCpuSpeed() |
| 36 | } |
| 37 | let cpusCycleTimeWeight = 0 |
| 38 | for (const cpu of currentCpus) { |
| 39 | // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition |
| 40 | if (cpu.speed == null || cpu.speed === 0) { |
| 41 | cpu.speed = |
| 42 | // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition |
| 43 | currentCpus.find(cpu => cpu.speed != null && cpu.speed !== 0)?.speed ?? |
| 44 | estCpuSpeed ?? |
| 45 | 2000 |
| 46 | } |
| 47 | // CPU estimated cycle time |
| 48 | const numberOfDigits = cpu.speed.toString().length - 1 |
| 49 | const cpuCycleTime = 1 / (cpu.speed / Math.pow(10, numberOfDigits)) |
| 50 | cpusCycleTimeWeight += cpuCycleTime * Math.pow(10, numberOfDigits) |
| 51 | } |
| 52 | return Math.round(cpusCycleTimeWeight / currentCpus.length) |
| 53 | } |
| 54 | |
| 55 | const getDefaultWeights = ( |
| 56 | poolMaxSize: number, |
| 57 | defaultWorkerWeight?: number |
| 58 | ): Record<number, number> => { |
| 59 | defaultWorkerWeight = defaultWorkerWeight ?? getDefaultWorkerWeight() |
| 60 | const weights: Record<number, number> = {} |
| 61 | for (let workerNodeKey = 0; workerNodeKey < poolMaxSize; workerNodeKey++) { |
| 62 | weights[workerNodeKey] = defaultWorkerWeight |
| 63 | } |
| 64 | return weights |
| 65 | } |
| 66 | |
| 67 | export const getWorkerChoiceStrategiesRetries = < |
| 68 | Worker extends IWorker, |
| 69 | Data, |
| 70 | Response |
| 71 | >( |
| 72 | pool: IPool<Worker, Data, Response>, |
| 73 | opts?: WorkerChoiceStrategyOptions |
| 74 | ): number => { |
| 75 | return ( |
| 76 | pool.info.maxSize + |
| 77 | Object.keys(opts?.weights ?? getDefaultWeights(pool.info.maxSize)).length |
| 78 | ) |
| 79 | } |
| 80 | |
| 81 | export const buildWorkerChoiceStrategyOptions = < |
| 82 | Worker extends IWorker, |
| 83 | Data, |
| 84 | Response |
| 85 | >( |
| 86 | pool: IPool<Worker, Data, Response>, |
| 87 | opts?: WorkerChoiceStrategyOptions |
| 88 | ): WorkerChoiceStrategyOptions => { |
| 89 | opts = structuredClone(opts ?? {}) |
| 90 | opts.weights = opts.weights ?? getDefaultWeights(pool.info.maxSize) |
| 91 | return { |
| 92 | ...{ |
| 93 | runTime: { median: false }, |
| 94 | waitTime: { median: false }, |
| 95 | elu: { median: false } |
| 96 | }, |
| 97 | ...opts |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | export const getWorkerChoiceStrategy = <Worker extends IWorker, Data, Response>( |
| 102 | workerChoiceStrategy: WorkerChoiceStrategy, |
| 103 | pool: IPool<Worker, Data, Response>, |
| 104 | context: ThisType<WorkerChoiceStrategiesContext<Worker, Data, Response>>, |
| 105 | opts?: WorkerChoiceStrategyOptions |
| 106 | ): IWorkerChoiceStrategy => { |
| 107 | switch (workerChoiceStrategy) { |
| 108 | case WorkerChoiceStrategies.ROUND_ROBIN: |
| 109 | return new (RoundRobinWorkerChoiceStrategy.bind(context))(pool, opts) |
| 110 | case WorkerChoiceStrategies.LEAST_USED: |
| 111 | return new (LeastUsedWorkerChoiceStrategy.bind(context))(pool, opts) |
| 112 | case WorkerChoiceStrategies.LEAST_BUSY: |
| 113 | return new (LeastBusyWorkerChoiceStrategy.bind(context))(pool, opts) |
| 114 | case WorkerChoiceStrategies.LEAST_ELU: |
| 115 | return new (LeastEluWorkerChoiceStrategy.bind(context))(pool, opts) |
| 116 | case WorkerChoiceStrategies.FAIR_SHARE: |
| 117 | return new (FairShareWorkerChoiceStrategy.bind(context))(pool, opts) |
| 118 | case WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN: |
| 119 | return new (WeightedRoundRobinWorkerChoiceStrategy.bind(context))( |
| 120 | pool, |
| 121 | opts |
| 122 | ) |
| 123 | case WorkerChoiceStrategies.INTERLEAVED_WEIGHTED_ROUND_ROBIN: |
| 124 | return new (InterleavedWeightedRoundRobinWorkerChoiceStrategy.bind( |
| 125 | context |
| 126 | ))(pool, opts) |
| 127 | default: |
| 128 | throw new Error( |
| 129 | // eslint-disable-next-line @typescript-eslint/restrict-template-expressions |
| 130 | `Worker choice strategy '${workerChoiceStrategy}' is not valid` |
| 131 | ) |
| 132 | } |
| 133 | } |