perf: optimize tasks stealing in corner case

Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org>

Author: jerome-benoit

CHANGELOG.md

@@ -8,6 +8,10 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Changed
+
+- Add a fastpath when tasks stealing or redistribution is impossible
+
 ## [0.0.13] - 2023-11-27
 
 ### Fixed

src/pools/abstract-pool.ts

@@ -1437,6 +1437,9 @@ export abstract class AbstractPool<
   }
 
   private redistributeQueuedTasks(workerNodeKey: number): void {
+    if (this.workerNodes.length <= 1) {
+      return
+    }
     while (this.tasksQueueSize(workerNodeKey) > 0) {
       const destinationWorkerNodeKey = this.workerNodes.reduce(
         (minWorkerNodeKey, workerNode, workerNodeKey, workerNodes) => {
@@ -1530,6 +1533,9 @@ export abstract class AbstractPool<
     event: CustomEvent<WorkerNodeEventDetail>,
     previousStolenTask?: Task<Data>,
   ): void => {
+    if (this.workerNodes.length <= 1) {
+      return
+    }
     const { workerNodeKey } = event.detail
     if (workerNodeKey == null) {
       throw new Error(
@@ -1627,6 +1633,9 @@ export abstract class AbstractPool<
   private readonly handleBackPressureEvent = (
     event: CustomEvent<WorkerNodeEventDetail>,
   ): void => {
+    if (this.workerNodes.length <= 1) {
+      return
+    }
     const { workerId } = event.detail
     const sizeOffset = 1
     if ((this.opts.tasksQueueOptions?.size as number) <= sizeOffset) {