import type { IWorker } from '../worker'
import type { IPool } from '../pool'
-import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils'
+import {
+ DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+ DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+} from '../../utils'
import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy'
import type {
IWorkerChoiceStrategy,
+ TaskStatisticsRequirements,
WorkerChoiceStrategyOptions
} from './selection-strategies-types'
* Selects the next worker with an interleaved weighted round robin scheduling algorithm.
*
* @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 InterleavedWeightedRoundRobinWorkerChoiceStrategy<
Worker extends IWorker,
>
extends AbstractWorkerChoiceStrategy<Worker, Data, Response>
implements IWorkerChoiceStrategy {
+ /** @inheritDoc */
+ public readonly taskStatisticsRequirements: TaskStatisticsRequirements = {
+ runTime: {
+ aggregate: true,
+ average: true,
+ median: false
+ },
+ waitTime: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+ elu: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS
+ }
+
/**
- * Worker node id where the current task will be submitted.
+ * Round id.
*/
- private currentWorkerNodeId: number = 0
+ private roundId: number = 0
/**
- * Current round id.
- * This is used to determine the current round weight.
+ * Default worker weight.
*/
- private currentRoundId: number = 0
+ private readonly defaultWorkerWeight: number
/**
* Round weights.
*/
private roundWeights: number[]
/**
- * Default worker weight.
+ * Worker node id.
*/
- private readonly defaultWorkerWeight: number
+ private workerNodeId: number = 0
+ /**
+ * Worker node virtual task runtime.
+ */
+ private workerNodeVirtualTaskRunTime: number = 0
/** @inheritDoc */
public constructor (
opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
) {
super(pool, opts)
- this.setTaskStatistics(this.opts)
+ this.setTaskStatisticsRequirements(this.opts)
this.defaultWorkerWeight = this.computeDefaultWorkerWeight()
this.roundWeights = this.getRoundWeights()
}
/** @inheritDoc */
public reset (): boolean {
- this.currentWorkerNodeId = 0
- this.currentRoundId = 0
+ this.resetWorkerNodeKeyProperties()
+ this.roundId = 0
+ this.workerNodeId = 0
+ this.workerNodeVirtualTaskRunTime = 0
return true
}
}
/** @inheritDoc */
- public choose (): number {
- let roundId: number | undefined
- let workerNodeId: number | undefined
+ public choose (): number | undefined {
for (
- let roundIndex = this.currentRoundId;
+ let roundIndex = this.roundId;
roundIndex < this.roundWeights.length;
roundIndex++
) {
+ this.roundId = roundIndex
for (
- let workerNodeKey = this.currentWorkerNodeId;
+ let workerNodeKey = this.workerNodeId;
workerNodeKey < this.pool.workerNodes.length;
workerNodeKey++
) {
+ this.workerNodeId = workerNodeKey
+ if (
+ this.workerNodeId !== this.nextWorkerNodeKey &&
+ this.workerNodeVirtualTaskRunTime !== 0
+ ) {
+ this.workerNodeVirtualTaskRunTime = 0
+ }
const workerWeight =
this.opts.weights?.[workerNodeKey] ?? this.defaultWorkerWeight
- if (workerWeight >= this.roundWeights[roundIndex]) {
- roundId = roundIndex
- workerNodeId = workerNodeKey
- break
+ if (
+ workerWeight >= this.roundWeights[roundIndex] &&
+ this.workerNodeVirtualTaskRunTime < workerWeight
+ ) {
+ this.workerNodeVirtualTaskRunTime =
+ this.workerNodeVirtualTaskRunTime +
+ this.getWorkerNodeTaskRunTime(workerNodeKey)
+ this.setPreviousWorkerNodeKey(this.nextWorkerNodeKey)
+ this.nextWorkerNodeKey = workerNodeKey
+ return this.nextWorkerNodeKey
}
}
}
- this.currentRoundId = roundId ?? 0
- this.currentWorkerNodeId = workerNodeId ?? 0
- const chosenWorkerNodeKey = this.currentWorkerNodeId
- if (this.currentWorkerNodeId === this.pool.workerNodes.length - 1) {
- this.currentWorkerNodeId = 0
- this.currentRoundId =
- this.currentRoundId === this.roundWeights.length - 1
- ? 0
- : this.currentRoundId + 1
+ this.interleavedWeightedRoundRobinNextWorkerNodeId()
+ }
+
+ private interleavedWeightedRoundRobinNextWorkerNodeId (): void {
+ if (
+ this.roundId === this.roundWeights.length - 1 &&
+ this.workerNodeId === this.pool.workerNodes.length - 1
+ ) {
+ this.roundId = 0
+ this.workerNodeId = 0
+ } else if (this.workerNodeId === this.pool.workerNodes.length - 1) {
+ this.roundId = this.roundId + 1
+ this.workerNodeId = 0
} else {
- this.currentWorkerNodeId = this.currentWorkerNodeId + 1
+ this.workerNodeId = this.workerNodeId + 1
}
- return chosenWorkerNodeKey
}
/** @inheritDoc */
public remove (workerNodeKey: number): boolean {
- if (this.currentWorkerNodeId === workerNodeKey) {
- if (this.pool.workerNodes.length === 0) {
- this.currentWorkerNodeId = 0
- } else if (this.currentWorkerNodeId > this.pool.workerNodes.length - 1) {
- this.currentWorkerNodeId = this.pool.workerNodes.length - 1
- this.currentRoundId =
- this.currentRoundId === this.roundWeights.length - 1
- ? 0
- : this.currentRoundId + 1
- }
+ if (this.pool.workerNodes.length === 0) {
+ this.reset()
+ }
+ if (
+ this.workerNodeId === workerNodeKey &&
+ this.workerNodeId > this.pool.workerNodes.length - 1
+ ) {
+ this.workerNodeId = this.pool.workerNodes.length - 1
+ }
+ if (
+ this.previousWorkerNodeKey === workerNodeKey &&
+ this.previousWorkerNodeKey > this.pool.workerNodes.length - 1
+ ) {
+ this.previousWorkerNodeKey = this.pool.workerNodes.length - 1
}
return true
}