-import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils'
+import { DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS } from '../../utils'
import type { IPool } from '../pool'
-import type { IWorker } from '../worker'
+import type { IWorker, StrategyData } from '../worker'
import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy'
import {
type IWorkerChoiceStrategy,
+ type InternalWorkerChoiceStrategyOptions,
Measurements,
- type TaskStatisticsRequirements,
- type WorkerChoiceStrategyOptions
+ type TaskStatisticsRequirements
} 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,
average: true,
median: false
},
- waitTime: {
- aggregate: false,
- average: false,
- median: false
- },
+ waitTime: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
elu: {
aggregate: true,
average: true,
}
}
- /**
- * Workers' virtual task end execution timestamp.
- */
- private workersVirtualTaskEndTimestamp: number[] = []
-
/** @inheritDoc */
public constructor (
pool: IPool<Worker, Data, Response>,
- opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+ opts: InternalWorkerChoiceStrategyOptions
) {
super(pool, opts)
this.setTaskStatisticsRequirements(this.opts)
/** @inheritDoc */
public reset (): boolean {
- this.workersVirtualTaskEndTimestamp = []
+ for (const workerNode of this.pool.workerNodes) {
+ delete workerNode.strategyData?.virtualTaskEndTimestamp
+ }
return true
}
/** @inheritDoc */
public update (workerNodeKey: number): boolean {
- this.computeWorkerVirtualTaskEndTimestamp(workerNodeKey)
+ this.pool.workerNodes[workerNodeKey].strategyData = {
+ virtualTaskEndTimestamp:
+ this.computeWorkerNodeVirtualTaskEndTimestamp(workerNodeKey)
+ }
return true
}
/** @inheritDoc */
- public choose (): number {
- let minWorkerVirtualTaskEndTimestamp = Infinity
- let chosenWorkerNodeKey!: number
- for (const [workerNodeKey] of this.pool.workerNodes.entries()) {
- if (this.workersVirtualTaskEndTimestamp[workerNodeKey] == null) {
- this.computeWorkerVirtualTaskEndTimestamp(workerNodeKey)
- }
- const workerVirtualTaskEndTimestamp =
- this.workersVirtualTaskEndTimestamp[workerNodeKey]
- if (workerVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp) {
- minWorkerVirtualTaskEndTimestamp = workerVirtualTaskEndTimestamp
- chosenWorkerNodeKey = workerNodeKey
- }
- }
- return chosenWorkerNodeKey
+ public choose (): number | undefined {
+ this.setPreviousWorkerNodeKey(this.nextWorkerNodeKey)
+ this.nextWorkerNodeKey = this.fairShareNextWorkerNodeKey()
+ return this.nextWorkerNodeKey
}
/** @inheritDoc */
- public remove (workerNodeKey: number): boolean {
- this.workersVirtualTaskEndTimestamp.splice(workerNodeKey, 1)
+ public remove (): boolean {
return true
}
+ private fairShareNextWorkerNodeKey (): number | undefined {
+ return this.pool.workerNodes.reduce(
+ (minWorkerNodeKey, workerNode, workerNodeKey, workerNodes) => {
+ if (workerNode.strategyData?.virtualTaskEndTimestamp == null) {
+ workerNode.strategyData = {
+ virtualTaskEndTimestamp:
+ this.computeWorkerNodeVirtualTaskEndTimestamp(workerNodeKey)
+ }
+ }
+ return this.isWorkerNodeReady(workerNodeKey) &&
+ (workerNode.strategyData.virtualTaskEndTimestamp as number) <
+ ((workerNodes[minWorkerNodeKey].strategyData as StrategyData)
+ .virtualTaskEndTimestamp as number)
+ ? workerNodeKey
+ : minWorkerNodeKey
+ },
+ 0
+ )
+ }
+
/**
* Computes the worker node key virtual task end timestamp.
*
* @param workerNodeKey - The worker node key.
+ * @returns The worker node key virtual task end timestamp.
*/
- private computeWorkerVirtualTaskEndTimestamp (workerNodeKey: number): void {
- this.workersVirtualTaskEndTimestamp[workerNodeKey] =
- this.getWorkerVirtualTaskEndTimestamp(
- workerNodeKey,
- this.getWorkerVirtualTaskStartTimestamp(workerNodeKey)
- )
+ private computeWorkerNodeVirtualTaskEndTimestamp (
+ workerNodeKey: number
+ ): number {
+ return this.getWorkerNodeVirtualTaskEndTimestamp(
+ workerNodeKey,
+ this.getWorkerNodeVirtualTaskStartTimestamp(workerNodeKey)
+ )
}
- private getWorkerVirtualTaskEndTimestamp (
+ private getWorkerNodeVirtualTaskEndTimestamp (
workerNodeKey: number,
- workerVirtualTaskStartTimestamp: number
+ workerNodeVirtualTaskStartTimestamp: number
): number {
- const workerTaskRunTime =
+ const workerNodeTaskRunTime =
this.opts.measurement === Measurements.elu
- ? this.getWorkerTaskElu(workerNodeKey)
- : this.getWorkerTaskRunTime(workerNodeKey)
- return workerVirtualTaskStartTimestamp + workerTaskRunTime
+ ? this.getWorkerNodeTaskElu(workerNodeKey)
+ : this.getWorkerNodeTaskRunTime(workerNodeKey)
+ return workerNodeVirtualTaskStartTimestamp + workerNodeTaskRunTime
}
- private getWorkerVirtualTaskStartTimestamp (workerNodeKey: number): number {
- return Math.max(
- performance.now(),
- this.workersVirtualTaskEndTimestamp[workerNodeKey] ?? -Infinity
- )
+ private getWorkerNodeVirtualTaskStartTimestamp (
+ workerNodeKey: number
+ ): number {
+ const virtualTaskEndTimestamp =
+ this.pool.workerNodes[workerNodeKey]?.strategyData
+ ?.virtualTaskEndTimestamp
+ const now = performance.now()
+ return now < (virtualTaskEndTimestamp ?? -Infinity)
+ ? (virtualTaskEndTimestamp as number)
+ : now
}
}