X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Fpools%2Fselection-strategies%2Ffair-share-worker-choice-strategy.ts;h=fc4bd1fd4de4f281c8dbae20fcf3014ca0a5565f;hb=9fe8fd698590c2494dc6793cfd8c08026fe88a31;hp=3f4e95249497897d0f718c4192880fecdc695129;hpb=027063571693f211b35c8851566a063201adb9af;p=poolifier.git

diff --git a/src/pools/selection-strategies/fair-share-worker-choice-strategy.ts b/src/pools/selection-strategies/fair-share-worker-choice-strategy.ts
index 3f4e9524..fc4bd1fd 100644
--- a/src/pools/selection-strategies/fair-share-worker-choice-strategy.ts
+++ b/src/pools/selection-strategies/fair-share-worker-choice-strategy.ts
@@ -1,25 +1,24 @@
+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
+import {
+  type IWorkerChoiceStrategy,
+  Measurements,
+  type TaskStatisticsRequirements,
+  type WorkerChoiceStrategyOptions
 } from './selection-strategies-types'
 
-/**
- * Worker virtual task timestamp.
- */
-interface WorkerVirtualTaskTimestamp {
-  start: number
-  end: number
-}
-
 /**
  * Selects the next worker with a fair share scheduling algorithm.
  * 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,
@@ -29,71 +28,106 @@ export class FairShareWorkerChoiceStrategy<
   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
+    }
   }
 
   /**
-   * Worker last virtual task execution timestamp.
+   * Workers' virtual task end execution timestamp.
    */
-  private readonly workerLastVirtualTaskTimestamp: Map<
-  number,
-  WorkerVirtualTaskTimestamp
-  > = new Map<number, WorkerVirtualTaskTimestamp>()
+  private workersVirtualTaskEndTimestamp: number[] = []
+
+  /** @inheritDoc */
+  public constructor (
+    pool: IPool<Worker, Data, Response>,
+    opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+  ) {
+    super(pool, opts)
+    this.setTaskStatisticsRequirements(this.opts)
+  }
 
   /** @inheritDoc */
   public reset (): boolean {
-    this.workerLastVirtualTaskTimestamp.clear()
+    this.workersVirtualTaskEndTimestamp = []
     return true
   }
 
   /** @inheritDoc */
-  public choose (): number {
-    let minWorkerVirtualTaskEndTimestamp = Infinity
-    let chosenWorkerNodeKey!: number
-    for (const [index] of this.pool.workerNodes.entries()) {
-      this.computeWorkerLastVirtualTaskTimestamp(index)
-      const workerLastVirtualTaskEndTimestamp =
-        this.workerLastVirtualTaskTimestamp.get(index)?.end ?? 0
-      if (
-        workerLastVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp
-      ) {
-        minWorkerVirtualTaskEndTimestamp = workerLastVirtualTaskEndTimestamp
-        chosenWorkerNodeKey = index
-      }
-    }
-    return chosenWorkerNodeKey
+  public update (workerNodeKey: number): boolean {
+    this.computeWorkerVirtualTaskEndTimestamp(workerNodeKey)
+    return true
+  }
+
+  /** @inheritDoc */
+  public choose (): number | undefined {
+    this.nextWorkerNodeKey = this.fairShareNextWorkerNodeKey()
+    return this.nextWorkerNodeKey
   }
 
   /** @inheritDoc */
   public remove (workerNodeKey: number): boolean {
-    const deleted = this.workerLastVirtualTaskTimestamp.delete(workerNodeKey)
-    for (const [key, value] of this.workerLastVirtualTaskTimestamp.entries()) {
-      if (key > workerNodeKey) {
-        this.workerLastVirtualTaskTimestamp.set(key - 1, value)
+    this.workersVirtualTaskEndTimestamp.splice(workerNodeKey, 1)
+    return true
+  }
+
+  private fairShareNextWorkerNodeKey (): number | undefined {
+    let minWorkerVirtualTaskEndTimestamp = Infinity
+    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)
+      }
+      const workerVirtualTaskEndTimestamp =
+        this.workersVirtualTaskEndTimestamp[workerNodeKey]
+      if (workerVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp) {
+        minWorkerVirtualTaskEndTimestamp = workerVirtualTaskEndTimestamp
+        chosenWorkerNodeKey = workerNodeKey
       }
     }
-    return deleted
+    return chosenWorkerNodeKey
   }
 
   /**
-   * Computes worker last virtual task timestamp.
+   * Computes the worker node key virtual task end timestamp.
    *
    * @param workerNodeKey - The worker node key.
    */
-  private computeWorkerLastVirtualTaskTimestamp (workerNodeKey: number): void {
-    const workerVirtualTaskStartTimestamp = Math.max(
+  private computeWorkerVirtualTaskEndTimestamp (workerNodeKey: number): void {
+    this.workersVirtualTaskEndTimestamp[workerNodeKey] =
+      this.getWorkerVirtualTaskEndTimestamp(
+        workerNodeKey,
+        this.getWorkerVirtualTaskStartTimestamp(workerNodeKey)
+      )
+  }
+
+  private getWorkerVirtualTaskEndTimestamp (
+    workerNodeKey: number,
+    workerVirtualTaskStartTimestamp: number
+  ): number {
+    const workerTaskRunTime =
+      this.opts.measurement === Measurements.elu
+        ? this.getWorkerTaskElu(workerNodeKey)
+        : this.getWorkerTaskRunTime(workerNodeKey)
+    return workerVirtualTaskStartTimestamp + workerTaskRunTime
+  }
+
+  private getWorkerVirtualTaskStartTimestamp (workerNodeKey: number): number {
+    return Math.max(
       performance.now(),
-      this.workerLastVirtualTaskTimestamp.get(workerNodeKey)?.end ?? -Infinity
+      this.workersVirtualTaskEndTimestamp[workerNodeKey] ?? -Infinity
     )
-    const workerVirtualTaskTRunTime = this.requiredStatistics.medRunTime
-      ? this.pool.workerNodes[workerNodeKey].tasksUsage.medRunTime
-      : this.pool.workerNodes[workerNodeKey].tasksUsage.avgRunTime
-    this.workerLastVirtualTaskTimestamp.set(workerNodeKey, {
-      start: workerVirtualTaskStartTimestamp,
-      end: workerVirtualTaskStartTimestamp + (workerVirtualTaskTRunTime ?? 0)
-    })
   }
 }