-import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils'
-import { PoolType, type IPool } from '../pool'
+import { cpus } from 'node:os'
+import {
+ DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+ DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+} from '../../utils'
+import type { IPool } from '../pool'
import type { IWorker } from '../worker'
import type {
IWorkerChoiceStrategy,
- RequiredStatistics,
+ StrategyPolicy,
+ TaskStatisticsRequirements,
WorkerChoiceStrategyOptions
} from './selection-strategies-types'
* Worker choice strategy abstract base class.
*
* @typeParam Worker - Type of worker which manages the strategy.
- * @typeParam Data - Type of data sent to the worker. This can only be serializable data.
- * @typeParam Response - Type of execution response. This can only be serializable data.
+ * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
+ * @typeParam Response - Type of execution response. This can only be structured-cloneable data.
*/
export abstract class AbstractWorkerChoiceStrategy<
Worker extends IWorker,
Data = unknown,
Response = unknown
> implements IWorkerChoiceStrategy {
+ // /**
+ // * Toggles finding the last free worker node key.
+ // */
+ // private toggleFindLastFreeWorkerNodeKey: boolean = false
+
+ /**
+ * Id of the next worker node.
+ */
+ protected nextWorkerNodeId: number = 0
+
/** @inheritDoc */
- protected readonly isDynamicPool: boolean
+ public readonly strategyPolicy: StrategyPolicy = {
+ useDynamicWorker: false
+ }
+
/** @inheritDoc */
- public readonly requiredStatistics: RequiredStatistics = {
- runTime: false,
- avgRunTime: false,
- medRunTime: false
+ public readonly taskStatisticsRequirements: TaskStatisticsRequirements = {
+ runTime: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+ waitTime: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+ elu: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS
}
/**
protected readonly pool: IPool<Worker, Data, Response>,
protected opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
) {
- this.isDynamicPool = this.pool.type === PoolType.DYNAMIC
this.choose = this.choose.bind(this)
}
- protected checkOptions (opts: WorkerChoiceStrategyOptions): void {
- if (this.requiredStatistics.avgRunTime && opts.medRunTime === true) {
- this.requiredStatistics.avgRunTime = false
- this.requiredStatistics.medRunTime = opts.medRunTime as boolean
+ protected setTaskStatisticsRequirements (
+ opts: WorkerChoiceStrategyOptions
+ ): void {
+ if (
+ this.taskStatisticsRequirements.runTime.average &&
+ opts.runTime?.median === true
+ ) {
+ this.taskStatisticsRequirements.runTime.average = false
+ this.taskStatisticsRequirements.runTime.median = opts.runTime
+ .median as boolean
+ }
+ if (
+ this.taskStatisticsRequirements.runTime.median &&
+ opts.runTime?.median === false
+ ) {
+ this.taskStatisticsRequirements.runTime.average = true
+ this.taskStatisticsRequirements.runTime.median = opts.runTime
+ .median as boolean
+ }
+ if (
+ this.taskStatisticsRequirements.waitTime.average &&
+ opts.waitTime?.median === true
+ ) {
+ this.taskStatisticsRequirements.waitTime.average = false
+ this.taskStatisticsRequirements.waitTime.median = opts.waitTime
+ .median as boolean
+ }
+ if (
+ this.taskStatisticsRequirements.waitTime.median &&
+ opts.waitTime?.median === false
+ ) {
+ this.taskStatisticsRequirements.waitTime.average = true
+ this.taskStatisticsRequirements.waitTime.median = opts.waitTime
+ .median as boolean
}
- if (this.requiredStatistics.medRunTime && opts.medRunTime === false) {
- this.requiredStatistics.avgRunTime = true
- this.requiredStatistics.medRunTime = opts.medRunTime as boolean
+ if (
+ this.taskStatisticsRequirements.elu.average &&
+ opts.elu?.median === true
+ ) {
+ this.taskStatisticsRequirements.elu.average = false
+ this.taskStatisticsRequirements.elu.median = opts.elu.median as boolean
+ }
+ if (
+ this.taskStatisticsRequirements.elu.median &&
+ opts.elu?.median === false
+ ) {
+ this.taskStatisticsRequirements.elu.average = true
+ this.taskStatisticsRequirements.elu.median = opts.elu.median as boolean
}
}
/** @inheritDoc */
public abstract reset (): boolean
+ /** @inheritDoc */
+ public abstract update (workerNodeKey: number): boolean
+
/** @inheritDoc */
public abstract choose (): number
/** @inheritDoc */
public setOptions (opts: WorkerChoiceStrategyOptions): void {
- opts = opts ?? DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
- this.checkOptions(opts)
- this.opts = opts
+ this.opts = opts ?? DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+ this.setTaskStatisticsRequirements(this.opts)
+ }
+
+ protected workerNodeReady (workerNodeKey: number): boolean {
+ return this.pool.workerNodes[workerNodeKey].info.ready
}
+
+ // /**
+ // * Finds a free worker node key.
+ // *
+ // * @returns The free worker node key or `-1` if there is no free worker node.
+ // */
+ // protected findFreeWorkerNodeKey (): number {
+ // if (this.toggleFindLastFreeWorkerNodeKey) {
+ // this.toggleFindLastFreeWorkerNodeKey = false
+ // return this.findLastFreeWorkerNodeKey()
+ // }
+ // this.toggleFindLastFreeWorkerNodeKey = true
+ // return this.findFirstFreeWorkerNodeKey()
+ // }
+
+ /**
+ * Gets the worker task runtime.
+ * If the task statistics require the average runtime, the average runtime is returned.
+ * If the task statistics require the median runtime , the median runtime is returned.
+ *
+ * @param workerNodeKey - The worker node key.
+ * @returns The worker task runtime.
+ */
+ protected getWorkerTaskRunTime (workerNodeKey: number): number {
+ return this.taskStatisticsRequirements.runTime.median
+ ? this.pool.workerNodes[workerNodeKey].usage.runTime?.median ?? 0
+ : this.pool.workerNodes[workerNodeKey].usage.runTime?.average ?? 0
+ }
+
+ /**
+ * Gets the worker task wait time.
+ * If the task statistics require the average wait time, the average wait time is returned.
+ * If the task statistics require the median wait time, the median wait time is returned.
+ *
+ * @param workerNodeKey - The worker node key.
+ * @returns The worker task wait time.
+ */
+ protected getWorkerTaskWaitTime (workerNodeKey: number): number {
+ return this.taskStatisticsRequirements.waitTime.median
+ ? this.pool.workerNodes[workerNodeKey].usage.waitTime?.median ?? 0
+ : this.pool.workerNodes[workerNodeKey].usage.waitTime?.average ?? 0
+ }
+
+ /**
+ * Gets the worker task ELU.
+ * If the task statistics require the average ELU, the average ELU is returned.
+ * If the task statistics require the median ELU, the median ELU is returned.
+ *
+ * @param workerNodeKey - The worker node key.
+ * @returns The worker task ELU.
+ */
+ protected getWorkerTaskElu (workerNodeKey: number): number {
+ return this.taskStatisticsRequirements.elu.median
+ ? this.pool.workerNodes[workerNodeKey].usage.elu.active?.median ?? 0
+ : this.pool.workerNodes[workerNodeKey].usage.elu.active?.average ?? 0
+ }
+
+ protected computeDefaultWorkerWeight (): number {
+ let cpusCycleTimeWeight = 0
+ for (const cpu of cpus()) {
+ // CPU estimated cycle time
+ const numberOfDigits = cpu.speed.toString().length - 1
+ const cpuCycleTime = 1 / (cpu.speed / Math.pow(10, numberOfDigits))
+ cpusCycleTimeWeight += cpuCycleTime * Math.pow(10, numberOfDigits)
+ }
+ return Math.round(cpusCycleTimeWeight / cpus().length)
+ }
+
+ // /**
+ // * Finds the first free worker node key based on the number of tasks the worker has applied.
+ // *
+ // * If a worker is found with `0` executing tasks, it is detected as free and its worker node key is returned.
+ // *
+ // * If no free worker is found, `-1` is returned.
+ // *
+ // * @returns A worker node key if there is one, `-1` otherwise.
+ // */
+ // private findFirstFreeWorkerNodeKey (): number {
+ // return this.pool.workerNodes.findIndex(workerNode => {
+ // return workerNode.usage.tasks.executing === 0
+ // })
+ // }
+
+ // /**
+ // * Finds the last free worker node key based on the number of tasks the worker has applied.
+ // *
+ // * If a worker is found with `0` executing tasks, it is detected as free and its worker node key is returned.
+ // *
+ // * If no free worker is found, `-1` is returned.
+ // *
+ // * @returns A worker node key if there is one, `-1` otherwise.
+ // */
+ // private findLastFreeWorkerNodeKey (): number {
+ // // It requires node >= 18.0.0:
+ // // return this.pool.workerNodes.findLastIndex(workerNode => {
+ // // return workerNode.usage.tasks.executing === 0
+ // // })
+ // for (
+ // let workerNodeKey = this.pool.workerNodes.length - 1;
+ // workerNodeKey >= 0;
+ // workerNodeKey--
+ // ) {
+ // if (this.pool.workerNodes[workerNodeKey].usage.tasks.executing === 0) {
+ // return workerNodeKey
+ // }
+ // }
+ // return -1
+ // }
}
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