-import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils'
+import {
+ DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+ DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+} from '../../utils'
import type { IPool } from '../pool'
import type { IWorker } from '../worker'
import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy'
-import type {
- IWorkerChoiceStrategy,
- RequiredStatistics,
- WorkerChoiceStrategyOptions
+import {
+ type IWorkerChoiceStrategy,
+ Measurements,
+ type TaskStatisticsRequirements,
+ type WorkerChoiceStrategyOptions
} from './selection-strategies-types'
/**
* Loosely modeled after the fair queueing algorithm: https://en.wikipedia.org/wiki/Fair_queuing.
*
* @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 class FairShareWorkerChoiceStrategy<
Worker extends IWorker,
extends AbstractWorkerChoiceStrategy<Worker, Data, Response>
implements IWorkerChoiceStrategy {
/** @inheritDoc */
- public readonly requiredStatistics: RequiredStatistics = {
- runTime: true,
- avgRunTime: true,
- medRunTime: false
+ public readonly taskStatisticsRequirements: TaskStatisticsRequirements = {
+ runTime: {
+ aggregate: true,
+ average: true,
+ median: false
+ },
+ waitTime: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+ elu: {
+ aggregate: true,
+ average: true,
+ median: false
+ }
}
/**
opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
) {
super(pool, opts)
- this.setRequiredStatistics(this.opts)
+ this.setTaskStatisticsRequirements(this.opts)
}
/** @inheritDoc */
}
/** @inheritDoc */
- public choose (): number {
+ public choose (): number | undefined {
+ this.nextWorkerNodeKey = this.fairShareNextWorkerNodeKey()
+ return this.nextWorkerNodeKey
+ }
+
+ /** @inheritDoc */
+ public remove (workerNodeKey: number): boolean {
+ this.workersVirtualTaskEndTimestamp.splice(workerNodeKey, 1)
+ return true
+ }
+
+ private fairShareNextWorkerNodeKey (): number | undefined {
let minWorkerVirtualTaskEndTimestamp = Infinity
- let chosenWorkerNodeKey!: number
+ let chosenWorkerNodeKey: number | undefined
for (const [workerNodeKey] of this.pool.workerNodes.entries()) {
+ if (!this.isWorkerNodeEligible(workerNodeKey)) {
+ continue
+ }
if (this.workersVirtualTaskEndTimestamp[workerNodeKey] == null) {
this.computeWorkerVirtualTaskEndTimestamp(workerNodeKey)
}
return chosenWorkerNodeKey
}
- /** @inheritDoc */
- public remove (workerNodeKey: number): boolean {
- this.workersVirtualTaskEndTimestamp.splice(workerNodeKey, 1)
- return true
- }
-
/**
* Computes the worker node key virtual task end timestamp.
*
workerNodeKey: number,
workerVirtualTaskStartTimestamp: number
): number {
- const workerVirtualTaskRunTime = this.requiredStatistics.medRunTime
- ? this.pool.workerNodes[workerNodeKey].tasksUsage.medRunTime
- : this.pool.workerNodes[workerNodeKey].tasksUsage.avgRunTime
- return workerVirtualTaskStartTimestamp + workerVirtualTaskRunTime
+ const workerTaskRunTime =
+ this.opts.measurement === Measurements.elu
+ ? this.getWorkerTaskElu(workerNodeKey)
+ : this.getWorkerTaskRunTime(workerNodeKey)
+ return workerVirtualTaskStartTimestamp + workerTaskRunTime
}
private getWorkerVirtualTaskStartTimestamp (workerNodeKey: number): number {