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0bbf65c3 | 1 | import { cpus } from 'node:os' |
bbeadd16 | 2 | import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils' |
08f3f44c | 3 | import type { IPool } from '../pool' |
f06e48d8 | 4 | import type { IWorker } from '../worker' |
10fcfaf4 JB |
5 | import type { |
6 | IWorkerChoiceStrategy, | |
6c6afb84 | 7 | StrategyPolicy, |
87de9ff5 | 8 | TaskStatisticsRequirements, |
da309861 | 9 | WorkerChoiceStrategyOptions |
10fcfaf4 | 10 | } from './selection-strategies-types' |
bdaf31cd JB |
11 | |
12 | /** | |
9cd39dd4 | 13 | * Worker choice strategy abstract base class. |
bdaf31cd | 14 | * |
38e795c1 JB |
15 | * @typeParam Worker - Type of worker which manages the strategy. |
16 | * @typeParam Data - Type of data sent to the worker. This can only be serializable data. | |
02706357 | 17 | * @typeParam Response - Type of execution response. This can only be serializable data. |
bdaf31cd JB |
18 | */ |
19 | export abstract class AbstractWorkerChoiceStrategy< | |
f06e48d8 | 20 | Worker extends IWorker, |
b2b1d84e JB |
21 | Data = unknown, |
22 | Response = unknown | |
17393ac8 | 23 | > implements IWorkerChoiceStrategy { |
cb70b19d JB |
24 | /** |
25 | * Toggles finding the last free worker node key. | |
26 | */ | |
27 | private toggleFindLastFreeWorkerNodeKey: boolean = false | |
6c6afb84 JB |
28 | |
29 | /** @inheritDoc */ | |
30 | public readonly strategyPolicy: StrategyPolicy = { | |
31 | useDynamicWorker: false | |
32 | } | |
33 | ||
afc003b2 | 34 | /** @inheritDoc */ |
87de9ff5 | 35 | public readonly taskStatisticsRequirements: TaskStatisticsRequirements = { |
932fc8be JB |
36 | runTime: { |
37 | aggregate: false, | |
38 | average: false, | |
39 | median: false | |
40 | }, | |
41 | waitTime: { | |
42 | aggregate: false, | |
43 | average: false, | |
44 | median: false | |
45 | }, | |
5df69fab JB |
46 | elu: { |
47 | aggregate: false, | |
48 | average: false, | |
49 | median: false | |
50 | } | |
10fcfaf4 | 51 | } |
bdaf31cd JB |
52 | |
53 | /** | |
6533c3e6 | 54 | * Constructs a worker choice strategy bound to the pool. |
bdaf31cd | 55 | * |
38e795c1 | 56 | * @param pool - The pool instance. |
da309861 | 57 | * @param opts - The worker choice strategy options. |
bdaf31cd JB |
58 | */ |
59 | public constructor ( | |
c4855468 | 60 | protected readonly pool: IPool<Worker, Data, Response>, |
a20f0ba5 | 61 | protected opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS |
b8f3418c | 62 | ) { |
7254e419 | 63 | this.choose = this.choose.bind(this) |
b8f3418c | 64 | } |
bdaf31cd | 65 | |
932fc8be JB |
66 | protected setTaskStatisticsRequirements ( |
67 | opts: WorkerChoiceStrategyOptions | |
68 | ): void { | |
87de9ff5 | 69 | if ( |
932fc8be JB |
70 | this.taskStatisticsRequirements.runTime.average && |
71 | opts.runTime?.median === true | |
87de9ff5 | 72 | ) { |
932fc8be JB |
73 | this.taskStatisticsRequirements.runTime.average = false |
74 | this.taskStatisticsRequirements.runTime.median = opts.runTime | |
75 | .median as boolean | |
da309861 | 76 | } |
87de9ff5 | 77 | if ( |
932fc8be JB |
78 | this.taskStatisticsRequirements.runTime.median && |
79 | opts.runTime?.median === false | |
87de9ff5 | 80 | ) { |
932fc8be JB |
81 | this.taskStatisticsRequirements.runTime.average = true |
82 | this.taskStatisticsRequirements.runTime.median = opts.runTime | |
83 | .median as boolean | |
a20f0ba5 | 84 | } |
87de9ff5 | 85 | if ( |
932fc8be JB |
86 | this.taskStatisticsRequirements.waitTime.average && |
87 | opts.waitTime?.median === true | |
87de9ff5 | 88 | ) { |
932fc8be JB |
89 | this.taskStatisticsRequirements.waitTime.average = false |
90 | this.taskStatisticsRequirements.waitTime.median = opts.waitTime | |
91 | .median as boolean | |
0567595a | 92 | } |
87de9ff5 | 93 | if ( |
932fc8be JB |
94 | this.taskStatisticsRequirements.waitTime.median && |
95 | opts.waitTime?.median === false | |
87de9ff5 | 96 | ) { |
932fc8be JB |
97 | this.taskStatisticsRequirements.waitTime.average = true |
98 | this.taskStatisticsRequirements.waitTime.median = opts.waitTime | |
99 | .median as boolean | |
0567595a | 100 | } |
5df69fab JB |
101 | if ( |
102 | this.taskStatisticsRequirements.elu.average && | |
103 | opts.elu?.median === true | |
104 | ) { | |
105 | this.taskStatisticsRequirements.elu.average = false | |
106 | this.taskStatisticsRequirements.elu.median = opts.elu.median as boolean | |
107 | } | |
108 | if ( | |
109 | this.taskStatisticsRequirements.elu.median && | |
110 | opts.elu?.median === false | |
111 | ) { | |
112 | this.taskStatisticsRequirements.elu.average = true | |
113 | this.taskStatisticsRequirements.elu.median = opts.elu.median as boolean | |
114 | } | |
da309861 JB |
115 | } |
116 | ||
afc003b2 | 117 | /** @inheritDoc */ |
a6f7f1b4 | 118 | public abstract reset (): boolean |
ea7a90d3 | 119 | |
138d29a8 | 120 | /** @inheritDoc */ |
a4958de2 | 121 | public abstract update (workerNodeKey: number): boolean |
138d29a8 | 122 | |
afc003b2 | 123 | /** @inheritDoc */ |
c923ce56 | 124 | public abstract choose (): number |
97a2abc3 | 125 | |
afc003b2 | 126 | /** @inheritDoc */ |
f06e48d8 | 127 | public abstract remove (workerNodeKey: number): boolean |
a20f0ba5 JB |
128 | |
129 | /** @inheritDoc */ | |
130 | public setOptions (opts: WorkerChoiceStrategyOptions): void { | |
d01e4d67 | 131 | opts = opts ?? DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS |
932fc8be | 132 | this.setTaskStatisticsRequirements(opts) |
a20f0ba5 JB |
133 | this.opts = opts |
134 | } | |
cb70b19d JB |
135 | |
136 | /** | |
137 | * Finds a free worker node key. | |
138 | * | |
139 | * @returns The free worker node key or `-1` if there is no free worker node. | |
140 | */ | |
141 | protected findFreeWorkerNodeKey (): number { | |
142 | if (this.toggleFindLastFreeWorkerNodeKey) { | |
143 | this.toggleFindLastFreeWorkerNodeKey = false | |
e0ae6100 | 144 | return this.findLastFreeWorkerNodeKey() |
cb70b19d JB |
145 | } |
146 | this.toggleFindLastFreeWorkerNodeKey = true | |
e0ae6100 JB |
147 | return this.findFirstFreeWorkerNodeKey() |
148 | } | |
149 | ||
f6b641d6 | 150 | /** |
e6606302 | 151 | * Gets the worker task runtime. |
932fc8be JB |
152 | * If the task statistics require the average runtime, the average runtime is returned. |
153 | * If the task statistics require the median runtime , the median runtime is returned. | |
f6b641d6 JB |
154 | * |
155 | * @param workerNodeKey - The worker node key. | |
e6606302 | 156 | * @returns The worker task runtime. |
f6b641d6 JB |
157 | */ |
158 | protected getWorkerTaskRunTime (workerNodeKey: number): number { | |
932fc8be | 159 | return this.taskStatisticsRequirements.runTime.median |
a4e07f72 JB |
160 | ? this.pool.workerNodes[workerNodeKey].workerUsage.runTime.median |
161 | : this.pool.workerNodes[workerNodeKey].workerUsage.runTime.average | |
f6b641d6 JB |
162 | } |
163 | ||
ef680bb8 JB |
164 | /** |
165 | * Gets the worker task wait time. | |
932fc8be JB |
166 | * If the task statistics require the average wait time, the average wait time is returned. |
167 | * If the task statistics require the median wait time, the median wait time is returned. | |
ef680bb8 JB |
168 | * |
169 | * @param workerNodeKey - The worker node key. | |
170 | * @returns The worker task wait time. | |
171 | */ | |
5df69fab | 172 | protected getWorkerTaskWaitTime (workerNodeKey: number): number { |
932fc8be | 173 | return this.taskStatisticsRequirements.waitTime.median |
a4e07f72 JB |
174 | ? this.pool.workerNodes[workerNodeKey].workerUsage.runTime.median |
175 | : this.pool.workerNodes[workerNodeKey].workerUsage.runTime.average | |
ef680bb8 JB |
176 | } |
177 | ||
5df69fab JB |
178 | /** |
179 | * Gets the worker task ELU. | |
9adcefab JB |
180 | * If the task statistics require the average ELU, the average ELU is returned. |
181 | * If the task statistics require the median ELU, the median ELU is returned. | |
5df69fab JB |
182 | * |
183 | * @param workerNodeKey - The worker node key. | |
184 | * @returns The worker task ELU. | |
185 | */ | |
186 | protected getWorkerTaskElu (workerNodeKey: number): number { | |
187 | return this.taskStatisticsRequirements.elu.median | |
188 | ? this.pool.workerNodes[workerNodeKey].workerUsage.elu.active.median | |
189 | : this.pool.workerNodes[workerNodeKey].workerUsage.elu.active.average | |
190 | } | |
191 | ||
0bbf65c3 JB |
192 | protected computeDefaultWorkerWeight (): number { |
193 | let cpusCycleTimeWeight = 0 | |
194 | for (const cpu of cpus()) { | |
195 | // CPU estimated cycle time | |
196 | const numberOfDigits = cpu.speed.toString().length - 1 | |
197 | const cpuCycleTime = 1 / (cpu.speed / Math.pow(10, numberOfDigits)) | |
198 | cpusCycleTimeWeight += cpuCycleTime * Math.pow(10, numberOfDigits) | |
199 | } | |
200 | return Math.round(cpusCycleTimeWeight / cpus().length) | |
201 | } | |
202 | ||
e0ae6100 JB |
203 | /** |
204 | * Finds the first free worker node key based on the number of tasks the worker has applied. | |
205 | * | |
1c6fe997 | 206 | * If a worker is found with `0` executing tasks, it is detected as free and its worker node key is returned. |
e0ae6100 JB |
207 | * |
208 | * If no free worker is found, `-1` is returned. | |
209 | * | |
210 | * @returns A worker node key if there is one, `-1` otherwise. | |
211 | */ | |
212 | private findFirstFreeWorkerNodeKey (): number { | |
213 | return this.pool.workerNodes.findIndex(workerNode => { | |
a4e07f72 | 214 | return workerNode.workerUsage.tasks.executing === 0 |
e0ae6100 JB |
215 | }) |
216 | } | |
217 | ||
218 | /** | |
219 | * Finds the last free worker node key based on the number of tasks the worker has applied. | |
220 | * | |
1c6fe997 | 221 | * If a worker is found with `0` executing tasks, it is detected as free and its worker node key is returned. |
e0ae6100 JB |
222 | * |
223 | * If no free worker is found, `-1` is returned. | |
224 | * | |
225 | * @returns A worker node key if there is one, `-1` otherwise. | |
226 | */ | |
227 | private findLastFreeWorkerNodeKey (): number { | |
0e7c56b0 | 228 | // It requires node >= 18.0.0: |
e0ae6100 | 229 | // return this.workerNodes.findLastIndex(workerNode => { |
a4e07f72 | 230 | // return workerNode.workerUsage.tasks.executing === 0 |
e0ae6100 | 231 | // }) |
0682ba15 JB |
232 | for ( |
233 | let workerNodeKey = this.pool.workerNodes.length - 1; | |
234 | workerNodeKey >= 0; | |
235 | workerNodeKey-- | |
236 | ) { | |
a4e07f72 JB |
237 | if ( |
238 | this.pool.workerNodes[workerNodeKey].workerUsage.tasks.executing === 0 | |
239 | ) { | |
0682ba15 | 240 | return workerNodeKey |
e0ae6100 JB |
241 | } |
242 | } | |
243 | return -1 | |
cb70b19d | 244 | } |
bdaf31cd | 245 | } |