X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Fpools%2Fselection-strategies%2Ffair-share-worker-choice-strategy.ts;h=a337278ba9ce75a074c1b32d751d8f928ec86496;hb=daa30e0e21087d1a3cf24b3dd38f703b1aba6d46;hp=e42d54d9fbabbe847731fd7b0387d9bb8a94f642;hpb=08f3f44cef6256fdbab1a2a56842b291fd6dcd42;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 e42d54d9..a337278b 100644
--- a/src/pools/selection-strategies/fair-share-worker-choice-strategy.ts
+++ b/src/pools/selection-strategies/fair-share-worker-choice-strategy.ts
@@ -1,28 +1,24 @@
-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 type { IWorker, StrategyData } 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'
 
-/**
- * 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,
@@ -32,72 +28,112 @@ 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
+    }
   }
 
-  /**
-   * Workers' virtual task execution timestamp.
-   */
-  private workersVirtualTaskTimestamp: WorkerVirtualTaskTimestamp[] = []
-
   /** @inheritDoc */
   public constructor (
     pool: IPool<Worker, Data, Response>,
     opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
   ) {
     super(pool, opts)
-    this.checkOptions(this.opts)
+    this.setTaskStatisticsRequirements(this.opts)
   }
 
   /** @inheritDoc */
   public reset (): boolean {
-    this.workersVirtualTaskTimestamp = []
+    for (const workerNode of this.pool.workerNodes) {
+      delete workerNode.strategyData?.virtualTaskEndTimestamp
+    }
     return true
   }
 
   /** @inheritDoc */
-  public choose (): number {
-    let minWorkerVirtualTaskEndTimestamp = Infinity
-    let chosenWorkerNodeKey!: number
-    for (const [workerNodeKey] of this.pool.workerNodes.entries()) {
-      this.computeWorkerVirtualTaskTimestamp(workerNodeKey)
-      const workerLastVirtualTaskEndTimestamp =
-        this.workersVirtualTaskTimestamp[workerNodeKey]?.end ?? 0
-      if (
-        workerLastVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp
-      ) {
-        minWorkerVirtualTaskEndTimestamp = workerLastVirtualTaskEndTimestamp
-        chosenWorkerNodeKey = workerNodeKey
-      }
+  public update (workerNodeKey: number): boolean {
+    this.pool.workerNodes[workerNodeKey].strategyData = {
+      virtualTaskEndTimestamp:
+        this.computeWorkerNodeVirtualTaskEndTimestamp(workerNodeKey)
     }
-    return chosenWorkerNodeKey
+    return true
   }
 
   /** @inheritDoc */
-  public remove (workerNodeKey: number): boolean {
-    this.workersVirtualTaskTimestamp.splice(workerNodeKey, 1)
+  public choose (): number | undefined {
+    this.setPreviousWorkerNodeKey(this.nextWorkerNodeKey)
+    this.nextWorkerNodeKey = this.fairShareNextWorkerNodeKey()
+    return this.nextWorkerNodeKey
+  }
+
+  /** @inheritDoc */
+  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 (workerNode.strategyData.virtualTaskEndTimestamp as number) <
+          ((workerNodes[minWorkerNodeKey].strategyData as StrategyData)
+            .virtualTaskEndTimestamp as number)
+          ? workerNodeKey
+          : minWorkerNodeKey
+      },
+      0
+    )
+  }
+
   /**
-   * Computes worker virtual task timestamp.
+   * 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 computeWorkerVirtualTaskTimestamp (workerNodeKey: number): void {
-    const workerVirtualTaskStartTimestamp = Math.max(
-      performance.now(),
-      this.workersVirtualTaskTimestamp[workerNodeKey]?.end ?? -Infinity
+  private computeWorkerNodeVirtualTaskEndTimestamp (
+    workerNodeKey: number
+  ): number {
+    return this.getWorkerNodeVirtualTaskEndTimestamp(
+      workerNodeKey,
+      this.getWorkerNodeVirtualTaskStartTimestamp(workerNodeKey)
     )
-    const workerVirtualTaskTRunTime = this.requiredStatistics.medRunTime
-      ? this.pool.workerNodes[workerNodeKey].tasksUsage.medRunTime
-      : this.pool.workerNodes[workerNodeKey].tasksUsage.avgRunTime
-    this.workersVirtualTaskTimestamp[workerNodeKey] = {
-      start: workerVirtualTaskStartTimestamp,
-      end: workerVirtualTaskStartTimestamp + (workerVirtualTaskTRunTime ?? 0)
-    }
+  }
+
+  private getWorkerNodeVirtualTaskEndTimestamp (
+    workerNodeKey: number,
+    workerNodeVirtualTaskStartTimestamp: number
+  ): number {
+    const workerNodeTaskRunTime =
+      this.opts.measurement === Measurements.elu
+        ? this.getWorkerNodeTaskElu(workerNodeKey)
+        : this.getWorkerNodeTaskRunTime(workerNodeKey)
+    return workerNodeVirtualTaskStartTimestamp + workerNodeTaskRunTime
+  }
+
+  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
   }
 }