3 All notable changes to this project will be documented in this file.
5 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
6 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
10 ## [4.0.12] - 2024-05-25
14 - Optimize circular buffer implementation to store task execution measurements.
16 ## [4.0.11] - 2024-05-21
20 - Switch to optimized circular buffer implementation to store task execution measurements.
22 ## [4.0.10] - 2024-05-20
26 - Ensure tasks stealing dynamic worker node is not destroyed on inactivity.
28 ## [4.0.9] - 2024-05-19
32 - Add ELU `utilization` statistics to pool information.
34 ## [4.0.8] - 2024-05-15
38 - Fix default task function worker choice strategy and priority handling.
40 ## [4.0.7] - 2024-05-13
44 - Add ELU statistics to pool information.
46 ## [4.0.6] - 2024-05-10
50 - Fix pools' `addTaskFunction()` type definition.
52 ## [4.0.5] - 2024-05-09
56 - Avoid queued tasks redistribution on the errored worker node.
58 ## [4.0.4] - 2024-05-08
62 - Disable `tasksStealingOnBackPressure` by default until performance issues under heavy load are sorted out.
64 ## [4.0.3] - 2024-05-08
68 - Optimize task(s) stealing by dequeuing task(s) from the last prioritized bucket.
70 ## [4.0.2] - 2024-05-06
74 - Ensure poolifier worker task performance measurement requirements are synchronized with task function objects' worker choice strategies.
76 ## [4.0.1] - 2024-05-02
80 - Ensure dynamic worker node are initialized with sensible worker node usage default values to avoid worker choice strategies biased decisions.
81 - Account for tasks wait time in task execution time computation in worker choice strategies to avoid biased decisions under load with several prioritized task functions and tasks queue enabled.
83 ## [4.0.0] - 2024-04-30
87 - Support per task function(s) priority and worker choice strategy definition via a task function object: `{ taskFunction: (data?: Data) => Response | Promise<Response>, priority?: number, strategy?: WorkerChoiceStrategy }`.
88 - Add priority queue based tasks queueing. One priority queue is divided into prioritized buckets to avoid queued tasks starvation under load.
89 - BREAKING CHANGE: `listTaskFunctionNames()` to `listTaskFunctionsProperties()` in pool and worker API returning registered task functions properties.
90 - BREAKING CHANGE: `strategy` field in pool information renamed to `defaultStrategy`.
94 - Ensure worker choice strategy options changes at runtime are propagated to poolifier workers.
96 ## [3.1.30] - 2024-04-22
100 - Fix `transferList` argument type definition.
102 ## [3.1.29] - 2024-04-02
106 - Fix possible race condition at worker node recreation on worker `error` and `exit` events.
108 ## [3.1.28] - 2024-04-01
112 - Ensure the minimum number of workers on a started pool is guaranteed.
114 ## [3.1.27] - 2024-03-27
118 - Fix publishing on JSR, take 4.
120 ## [3.1.26] - 2024-03-27
124 - Fix publishing on JSR, take 3.
126 ## [3.1.25] - 2024-03-27
130 - Fix publishing on JSR, take 2.
132 ## [3.1.24] - 2024-03-27
136 - Fix publishing on JSR.
138 ## [3.1.23] - 2024-03-27
144 ## [3.1.22] - 2024-03-15
148 - Fix pool event emitter registered callbacks removal at `destroy()`.
150 ## [3.1.21] - 2024-02-22
154 - Fix null exception regression: [#1496](https://github.com/poolifier/poolifier/issues/1496).
156 ## [3.1.20] - 2024-02-11
160 - Ensure `worker_threads` workers are unreferenced at termination.
162 ## [3.1.19] - 2024-01-16
166 - Fix possible null exception at task finishing handling.
170 - Optimize Deque implementation to improve tasks queueing performance.
172 ## [3.1.18] - 2024-01-06
176 - Fix dynamic pool with minimum number of workers set to zero: [#1748](https://github.com/poolifier/poolifier/issues/1748).
178 ## [3.1.17] - 2024-01-05
182 - Improve performance by clean up unneeded condition checks on hot code paths.
184 ## [3.1.16] - 2024-01-03
188 - Add missing type to TS type definitions.
190 ## [3.1.15] - 2024-01-02
194 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
196 ## [3.1.15-0] - 2024-01-02
200 - Fix CommonJS support with TypeScript: [#1821](https://github.com/poolifier/poolifier/issues/1821).
202 ## [3.1.14] - 2024-01-01
206 - Properly handle dynamic pool with zero minimum size.
208 ## [3.1.13] - 2023-12-30
212 - Reduce branching in several hot code paths.
213 - Use faster object cloning implementation.
215 ## [3.1.12] - 2023-12-27
219 - Fix tasks redistribution triggers at pool destroying.
223 - Switch TypeScript module resolution to Node16.
225 ## [3.1.12-0] - 2023-12-27
229 - Fix tasks redistribution triggers at pool destroying.
231 ## [3.1.11] - 2023-12-24
235 - Avoid worker node cross tasks stealing.
236 - Ensure only half the pool worker nodes can steal tasks.
238 ## [3.1.10] - 2023-12-23
242 - Avoid useless branching on pool type.
244 ## [3.1.9] - 2023-12-22
248 - Readd ThreadPoolOptions and ClusterPoolOptions TS type aliases to PoolOptions.
250 ## [3.1.8] - 2023-12-21
254 - Fix default worker weight computation.
255 - Fix possible null exception at pool destroying.
257 ## [3.1.7] - 2023-12-20
261 - Ensure worker choice strategies implementation wait for worker node readiness: [#1748](https://github.com/poolifier/poolifier/issues/1748).
263 ## [3.1.6] - 2023-12-18
267 - Fix pool destroying with tasks queuing enabled.
269 ## [3.1.5] - 2023-12-18
273 - Add queued tasks end timeout support to worker node termination.
275 ## [3.1.4] - 2023-12-18
279 - Make more robust the fix for possible null exception at handling task execution response.
281 ## [3.1.3] - 2023-12-17
285 - Fix possible null exception at handling task execution response.
287 ## [3.1.2] - 2023-12-17
291 - Wait for queued tasks to end at worker node termination.
293 ## [3.1.1] - 2023-12-16
297 - Fix pool options TS type definition.
299 ## [3.1.0] - 2023-12-16
303 - TypeScript breaking change: merge ThreadPoolOptions and ClusterPoolOptions types into PoolOptions type.
305 ## [3.0.14] - 2023-12-13
309 - Fix possible null exception with worker_threads pools.
311 ## [3.0.13] - 2023-12-12
315 - Ensure worker choice strategy wait for worker nodes readiness.
319 - Remove infinite retries support in worker choice strategy to avoid configuration leading to possible infinite recursion or loop.
321 ## [3.0.12] - 2023-12-12
325 - Add infinite retries support in worker choice strategy.
327 ## [3.0.11] - 2023-12-11
331 - Ensure pool asynchronous resource properly track tasks execution.
333 ## [3.0.10] - 2023-12-08
337 - Add a fastpath when tasks stealing or redistribution is impossible.
339 ## [3.0.9] - 2023-11-26
343 - Remove all pool events listener at pool destroying.
344 - Remove all worker node events listener at worker node destroying.
345 - Fix worker node event emitter listeners handling memory leak at pool options runtime change.
347 ## [3.0.8] - 2023-11-25
351 - Ensure continuous tasks stealing on idle start at worker node idling.
353 ## [3.0.7] - 2023-11-24
357 - Make continuous tasks stealing start at worker node idling.
359 ## [3.0.6] - 2023-11-24
363 - Ensure pool statuses are checked at initialization, `start()` or `destroy()`.
364 - Ensure pool `ready` event can be emitted after several `start()/destroy()` cycles.
366 ## [3.0.5] - 2023-10-27
370 - Ensure pool `ready` event can be emitted only once.
372 ## [3.0.4] - 2023-10-20
376 - Switch to Bencher for benchmarking: [https://bencher.dev/perf/poolifier](https://bencher.dev/perf/poolifier).
377 - Use builtin retry mechanism in worker choice strategies instead of custom one.
379 ## [3.0.3] - 2023-10-19
383 - Avoid null exception at sending message to worker.
384 - Avoid null exception at checking worker node readiness.
386 ## [3.0.2] - 2023-10-17
390 - Fix race condition at dynamic worker node task assignment and scheduled removal. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468) and [#1496](https://github.com/poolifier/poolifier/issues/1496).
392 ## [3.0.1] - 2023-10-16
396 - Workaround possible race condition at work nodes array element removal and querying. See issue [#1468](https://github.com/poolifier/poolifier/issues/1468).
400 - Switch the worker node eventing code to `EventTarget` API.
402 ## [3.0.0] - 2023-10-08
406 - Remove Node.js 16.x.x (EOL) support.
408 ## [2.7.5] - 2023-10-03
412 - Use `EventEmitterAsyncResource` type from `@types/node` for pool event emitter. TypeScript users will need to update to latest `@types/node` version.
414 ## [2.7.4] - 2023-09-25
418 - Fix source maps (bundler issue).
420 ## [2.7.3] - 2023-09-24
424 - Convert pool event emitter to event emitter async resource.
426 ## [2.7.2] - 2023-09-23
430 - Add source maps to npm package to ease debugging.
434 - Continuous benchmarking versus other worker pools: [https://poolifier.github.io/benchmark](https://poolifier.github.io/benchmark).
436 ## [2.7.1] - 2023-09-20
440 - Ensure worker message listener used one time are removed after usage.
442 ## [2.7.0] - 2023-09-19
446 - Fix task stealing related tasks queue options handling at runtime.
450 - Rename `listTaskFunctions()` to `listTaskFunctionNames()` in pool and worker API.
454 - Add `hasTaskFunction()`, `addTaskFunction()`, `removeTaskFunction()`, `setDefaultTaskFunction()` methods to pool API: [PR #1148](https://github.com/poolifier/poolifier/pull/1148).
455 - Stricter worker constructor arguments validation.
457 ## [2.6.45] - 2023-09-17
461 - Disable publication on GitHub packages registry on release until authentication issue is fixed.
465 - Add `startWorkers` to pool options to whether start the minimum number of workers at pool initialization or not.
466 - Add `start()` method to pool API to start the minimum number of workers.
467 - Add `taskStealing` and `tasksStealingOnBackPressure` to tasks queue options to whether enable task stealing or not and whether enable tasks stealing under back pressure or not.
468 - Continuous internal benchmarking: [https://poolifier.github.io/benchmark-results/dev/bench](https://poolifier.github.io/benchmark-results/dev/bench).
470 ## [2.6.44] - 2023-09-08
474 - Use a dedicated PAT to publish on GitHub packages registry.
478 - Publish on GitHub packages registry on release.
482 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
484 ## [2.6.43] - 2023-09-08
488 - Publish on GitHub packages registry on release.
492 - Switch from rome to biome: [PR #1128](https://github.com/poolifier/poolifier/pull/1128).
494 ## [2.6.42] - 2023-09-06
498 - Optimize hot code paths implementation: avoid unnecessary branching, add and use optimized helpers (min, max), use reduce() array helper, ...
500 ## [2.6.41] - 2023-09-03
504 - Optimize worker choice strategies implementation.
506 ## [2.6.40] - 2023-09-01
510 - Do not pre-choose in WRR worker choice strategy to avoid bias.
511 - Avoid array out of bound in worker choice strategies after worker node removal.
513 ## [2.6.39] - 2023-08-30
517 - Fix race condition in worker choice strategies at worker node info querying while not yet initialized.
519 ## [2.6.38] - 2023-08-30
523 - Bundle typescript types declaration into one file.
527 - Improve interleaved weighted round robin worker choice strategy implementation.
529 ## [2.6.37] - 2023-08-28
533 - Ensure unused worker usage statistics are deleted at runtime.
537 - Rename worker choice strategy options `choiceRetries` to `retries`.
538 - Avoid unnecessary branching in worker choice strategies.
540 ## [2.6.36] - 2023-08-27
544 - Fix pool `execute()` arguments check.
548 - Make continuous tasks stealing algorithm less aggressive.
549 - Fine tune tasks stealing algorithm under back pressure.
551 ## [2.6.35] - 2023-08-25
555 - Don't account worker usage statistics for tasks that have failed.
556 - Fix pool information runtime and wait time median computation.
560 - Update simple moving average implementation to use a circular buffer.
561 - Update simple moving median implementation to use a circular buffer.
562 - Account for stolen tasks in worker usage statistics and pool information.
566 - Continuous tasks stealing algorithm.
568 ## [2.6.34] - 2023-08-24
572 - Avoid cascading tasks stealing under back pressure.
576 - Add fastpath to queued tasks rescheduling.
578 ## [2.6.33] - 2023-08-24
582 - Fix queued tasks rescheduling.
586 - Rename tasks queue options `queueMaxSize` to `size`.
590 - Task stealing scheduling algorithm if tasks queueing is enabled.
592 ## [2.6.32] - 2023-08-23
596 - Ensure no task can be executed when the pool is destroyed.
600 - Add `queueMaxSize` option to tasks queue options.
601 - Add O(1) deque implementation implemented with doubly linked list and use it for tasks queueing.
602 - Add tasks stealing algorithm when a worker node queue is back pressured if tasks queueing is enabled.
604 ## [2.6.31] - 2023-08-20
608 - Fix worker choice strategy retries mechanism in some edge cases.
612 - Make orthogonal worker choice strategies tasks distribution and created dynamic worker usage.
613 - Remove the experimental status of the `LEAST_ELU` worker choice strategy.
615 ## [2.6.30] - 2023-08-19
619 - Ensure pool event `backPressure` is emitted.
620 - Ensure pool event `full` is emitted only once.
621 - Ensure worker node cannot be instantiated without proper arguments.
623 ## [2.6.29] - 2023-08-18
627 - Fix race condition between readiness and task functions worker message handling at startup.
628 - Fix duplicate task function worker usage statistics computation per task function.
629 - Update task function worker usage statistics if and only if there's at least two different task functions.
630 - Fix race condition at task function worker usage executing task computation leading to negative value.
634 - Add back pressure detection on the worker node queue. Event `backPressure` is emitted when all worker node queues are full (worker node queue size >= poolMaxSize^2).
635 - Use back pressure detection in worker choice strategies.
636 - Add worker choice strategies retries mechanism if no worker is eligible.
638 ## [2.6.28] - 2023-08-16
642 - Ensure pool workers are properly initialized.
646 - HTTP server pool examples: express-cluster, express-hybrid.
650 - Remove now useless branching in worker hot code path.
652 ## [2.6.27] - 2023-08-15
656 - Add `KillHandler` type definition to exported types.
660 - Add `destroy` event to pool API.
662 ## [2.6.26] - 2023-08-15
666 - Add kill handler to worker options allowing to execute custom code when worker is killed.
667 - Add `listTaskFunctions()` method to pool API.
668 - SMTP client pool example: nodemailer.
670 ## [2.6.25] - 2023-08-13
674 - HTTP server pool examples: fastify-cluster, fastify-hybrid.
675 - WebSocket server pool examples: ws-cluster, ws-hybrid.
677 ## [2.6.24] - 2023-08-12
681 - Add array of transferable objects to the `execute()` method arguments.
682 - WebSocket server pool examples: ws-worker_threads.
684 ## [2.6.23] - 2023-08-11
688 - Fix pool busyness semantic when tasks queueing is enabled: the pool is busy when the number of executing tasks on each worker has reached the maximum tasks concurrency per worker.
692 - HTTP client pool examples: fetch, node-fetch and axios with multiple task functions.
693 - HTTP server pool examples: express-worker_threads, fastify-worker_threads.
695 ## [2.6.22] - 2023-08-10
699 - Add missing `types` field to package.json `exports`.
703 - Structure markdown documentation (PR #811).
705 ## [2.6.21] - 2023-08-03
709 - Improve code documentation.
710 - Code refactoring and cleanup for better maintainability and readability.
712 ## [2.6.20] - 2023-07-21
716 - Fix queued tasks redistribution on error task execution starvation.
717 - Ensure tasks queueing per worker condition is untangled from the pool busyness semantic.
721 - Drastically reduce lookups by worker in the worker nodes.
723 ## [2.6.19] - 2023-07-20
727 - Dedicated internal communication channel for worker_threads pools.
729 ## [2.6.18] - 2023-07-19
733 - Code refactoring and cleanup for better maintainability and readability. Bundle size is a bit smaller.
735 ## [2.6.17] - 2023-07-16
739 - Add `listTaskFunctions()` method to worker API.
741 ## [2.6.16] - 2023-07-12
745 - Fix pool startup detection.
746 - Fix worker task functions handling.
748 ## [2.6.15] - 2023-07-11
752 - Take into account worker node readiness in worker choice strategies.
754 ## [2.6.14] - 2023-07-10
758 - Fix task function statistics tracking.
760 ## [2.6.13] - 2023-07-10
764 - Add per task function statistics tracking.
765 - Add public methods to manipulate the worker task functions at runtime.
767 ## [2.6.12] - 2023-07-09
771 - Workaround import issue with `node:os` module in node 16.x.x.
773 ## [2.6.11] - 2023-07-09
777 - Fix pool readiness semantic.
779 ## [2.6.10] - 2023-07-08
783 - Ensure workers are not recreated on error at pool startup.
787 - Add `ready` and `strategy` fields to pool information.
788 - Add pool event `ready` to notify when the number of workers created in the pool has reached the maximum size expected and are ready.
789 - Add dynamic pool sizing checks.
791 ## [2.6.9] - 2023-07-07
795 - Recreate the right worker type on uncaught exception.
799 - Add minimum and maximum to internal measurement statistics.
800 - Add `runTime` and `waitTime` to pool information.
801 - Check worker inactive time only on dynamic worker.
803 ## [2.6.8] - 2023-07-03
807 - Brown paper bag release to fix version handling in pool information.
809 ## [2.6.7] - 2023-07-03
813 - Ensure worker queued tasks at error are reassigned to other pool workers.
817 - Add pool `utilization` ratio to pool information.
818 - Add `version` to pool information.
819 - Add worker information to worker nodes.
821 ## [2.6.6] - 2023-07-01
825 - Add safe helper `availableParallelism()` to help sizing the pool.
829 - Ensure message handler is only registered in worker.
831 ## [2.6.5] - 2023-06-27
835 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
839 - Artificial version bump to 2.6.5 to workaround publication issue.
840 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
841 - Ensure pool event is emitted before task error promise rejection.
842 - Fix queued tasks count computation.
846 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
848 ## [2.6.4] - 2023-06-27
852 - Cluster pools tasks execution are not working by using ESM files extension: https://github.com/poolifier/poolifier/issues/782
856 - Ensure cluster pool `destroy()` gracefully shutdowns worker's server.
857 - Ensure pool event is emitted before task error promise rejection.
858 - Fix queued tasks count computation.
862 - Remove unneeded worker_threads worker `MessageChannel` internal usage for IPC.
864 ## [2.6.3] - 2023-06-19
868 - Ensure no tasks are queued when trying to soft kill a dynamic worker.
869 - Update strategies internals after statistics computation.
873 - Optimize O(1) queue implementation.
875 ## [2.6.2] - 2023-06-12
879 - Fix new worker use after creation in dynamic pool given the current worker choice strategy.
881 ## [2.6.1] - 2023-06-10
885 - Add worker choice strategy documentation: [README.md](./docs/worker-choice-strategies.md).
889 - Fix average statistics computation: ensure failed tasks are not accounted.
891 ## [2.6.0] - 2023-06-09
895 - Add `LEAST_ELU` worker choice strategy (experimental).
896 - Add tasks ELU instead of runtime support to `FAIR_SHARE` worker choice strategy.
900 - Refactor pool worker node usage internals.
901 - Breaking change: refactor worker choice strategy statistics requirements: the syntax of the worker choice strategy options has changed.
902 - Breaking change: pool information `info` property object fields have been renamed.
906 - Fix wait time accounting.
907 - Ensure worker choice strategy `LEAST_BUSY` accounts also tasks wait time.
908 - Ensure worker choice strategy `LEAST_USED` accounts also queued tasks.
910 ## [2.5.4] - 2023-06-07
914 - Add Event Loop Utilization (ELU) statistics to worker tasks usage.
918 - Compute statistics at the worker level only if needed.
919 - Add `worker_threads` options to thread pool options.
923 - Make the `LEAST_BUSY` strategy only relies on task runtime.
925 ## [2.5.3] - 2023-06-04
929 - Refine pool information content.
930 - Limit pool internals public exposure.
932 ## [2.5.2] - 2023-06-02
936 - Add `taskError` pool event for task execution error.
937 - Add pool information `info` property to pool.
938 - Emit pool information on `busy` and `full` pool events.
940 ## [2.5.1] - 2023-06-01
944 - Add pool option `restartWorkerOnError` to restart worker on uncaught error. Default to `true`.
945 - Add `error` pool event for uncaught worker error.
947 ## [2.5.0] - 2023-05-31
951 - Switch pool event emitter to `EventEmitterAsyncResource`.
952 - Add tasks wait time accounting in per worker tasks usage.
953 - Add interleaved weighted round robin `INTERLEAVED_WEIGHTED_ROUND_ROBIN` worker choice strategy (experimental).
957 - Renamed worker choice strategy `LESS_BUSY` to `LEAST_BUSY` and `LESS_USED` to `LEAST_USED`.
959 ## [2.4.14] - 2023-05-09
963 - Ensure no undefined task runtime can land in the tasks history.
964 - Fix median computation implementation once again.
968 - Unit tests for median and queue implementations.
970 ## [2.4.13] - 2023-05-08
974 - Fix worker choice strategy options validation.
975 - Fix fair share worker choice strategy internals update: ensure virtual task end timestamp is computed at task submission.
977 ## [2.4.12] - 2023-05-06
981 - Support multiple task functions per worker.
982 - Add custom worker weights support to worker choice strategies options.
986 - Use O(1) queue implementation for tasks queueing.
990 - Fix median computation implementation.
991 - Fix fair share worker choice strategy internals update.
993 ## [2.4.11] - 2023-04-23
997 - Optimize free worker finding in worker choice strategies.
999 ## [2.4.10] - 2023-04-15
1003 - Fix typescript type definition for task function: ensure the input data is optional.
1004 - Fix typescript type definition for pool execute(): ensure the input data is optional.
1006 ## [2.4.9] - 2023-04-15
1010 - Add tasks queue enablement runtime setter to pool.
1011 - Add tasks queue options runtime setter to pool.
1012 - Add worker choice strategy options runtime setter to pool.
1016 - Remove the tasks queuing experimental status.
1020 - Fix task function type definition and validation.
1021 - Fix worker choice strategy options handling.
1023 ## [2.4.8] - 2023-04-12
1027 - Fix message between main worker and worker type definition for tasks.
1028 - Fix code documentation.
1030 ## [2.4.7] - 2023-04-11
1034 - Add worker tasks queue options to pool options.
1038 - Fix missing documentation.
1040 ## [2.4.6] - 2023-04-10
1044 - Ensure one task at a time is executed per worker with tasks queueing enabled.
1045 - Properly count worker executing tasks with tasks queueing enabled.
1047 ## [2.4.5] - 2023-04-09
1051 - Use monotonic high resolution timer for worker tasks runtime.
1052 - Add worker tasks median runtime to statistics.
1053 - Add worker tasks queue (experimental).
1055 ## [2.4.4] - 2023-04-07
1059 - Add `PoolEvents` enumeration and `PoolEvent` type.
1063 - Destroy worker only on alive check.
1065 ## [2.4.3] - 2023-04-07
1069 - Fix typedoc generation with inheritance.
1071 ## [2.4.2] - 2023-04-06
1075 - Add `full` event to dynamic pool.
1076 - Keep worker choice strategy in memory for conditional reuse.
1080 - Fix possible negative worker key at worker removal in worker choice strategies.
1082 ## [2.4.1] - 2023-04-05
1086 - Optimize worker choice strategy for dynamic pool.
1090 - Ensure dynamic pool does not alter worker choice strategy expected behavior.
1092 ## [2.4.0] - 2023-04-04
1096 - Add `LESS_BUSY` worker choice strategy.
1100 - Optimize worker storage in pool.
1101 - Optimize worker alive status check.
1102 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1103 - Optimize `LESS_USED` worker choice strategy.
1104 - Update benchmark versus external threads pools.
1105 - Optimize tasks usage statistics requirements for worker choice strategy.
1109 - Ensure trimmable characters are checked at pool initialization.
1110 - Fix message id integer overflow.
1111 - Fix pool worker removal in worker choice strategy internals.
1112 - Fix package publication with pnpm.
1114 ## [2.4.0-3] - 2023-04-04
1118 - Add `LESS_BUSY` worker choice strategy.
1122 - Optimize worker storage in pool.
1123 - Optimize worker alive status check.
1124 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1125 - Optimize `LESS_USED` worker choice strategy.
1126 - Update benchmark versus external threads pools.
1130 - Ensure trimmable characters are checked at pool initialization.
1131 - Fix message id integer overflow.
1132 - Fix pool worker removal in worker choice strategy internals.
1133 - Fix package publication with pnpm.
1135 ## [2.4.0-2] - 2023-04-03
1139 - Add `LESS_BUSY` worker choice strategy.
1143 - Optimize worker storage in pool.
1144 - Optimize worker alive status check.
1145 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1146 - Optimize `LESS_USED` worker choice strategy.
1150 - Ensure trimmable characters are checked at pool initialization.
1151 - Fix message id integer overflow.
1152 - Fix pool worker removal in worker choice strategy internals.
1153 - Fix package publication with pnpm.
1155 ## [2.4.0-1] - 2023-04-03
1159 - Add `LESS_BUSY` worker choice strategy.
1163 - Optimize worker storage in pool.
1164 - Optimize worker alive status check.
1165 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1166 - Optimize `LESS_USED` worker choice strategy.
1170 - Ensure trimmable characters are checked at pool initialization.
1171 - Fix message id integer overflow.
1172 - Fix pool worker removal in worker choice strategy internals.
1174 ## [2.4.0-0] - 2023-04-03
1178 - Add `LESS_BUSY` worker choice strategy.
1182 - Optimize worker storage in pool.
1183 - Optimize worker alive status check.
1184 - BREAKING CHANGE: Rename worker choice strategy `LESS_RECENTLY_USED` to `LESS_USED`.
1185 - Optimize `LESS_USED` worker choice strategy.
1189 - Ensure trimmable characters are checked at pool initialization.
1190 - Fix message id integer overflow.
1191 - Fix pool worker removal in worker choice strategy internals.
1193 ## [2.3.10] - 2023-03-18
1197 - Fix package.json `exports` syntax for ESM and CommonJS.
1201 - Permit SemVer pre-release publication.
1203 ## [2.3.10-2] - 2023-03-18
1207 - Fix package.json `exports` syntax for ESM and CommonJS.
1209 ## [2.3.10-1] - 2023-03-18
1213 - Permit SemVer pre-release publication.
1215 ## [2.3.10-0] - 2023-03-18
1219 - Fix package.json `exports` syntax for ESM and CommonJS.
1221 ## [2.3.9] - 2023-03-18
1225 - Introduce ESM module support along with CommonJS one.
1229 - Fix brown paper bag bug referencing the same object literal.
1231 ## [2.3.8] - 2023-03-18
1235 - Switch internal benchmarking code to benny.
1236 - Switch to TypeScript 5.x.x.
1237 - Switch rollup bundler plugins to core ones.
1238 - Switch to TSDoc syntax.
1239 - Enforce conventional commits.
1243 - Fix random integer generator.
1244 - Fix worker choice strategy pool type identification at initialization.
1246 ## [2.3.7] - 2022-10-23
1250 - Switch to open collective FOSS project funding platform.
1251 - Switch to ts-standard linter configuration on TypeScript code.
1255 - Fixed missing async on pool execute method.
1256 - Fixed typing in TypeScript example.
1257 - Fixed types in unit tests.
1259 ## [2.3.6] - 2022-10-22
1263 - Cleanup pool attributes and methods.
1264 - Refine error types thrown.
1268 - Fix continuous integration build on windows.
1269 - Fix code coverage reporting by using c8 instead of nyc.
1271 ## [2.3.5] - 2022-10-21
1275 - Improve benchmarks: add IO intensive task workload, add task size option, integrate code into linter.
1276 - Optimize tasks usage lookup implementation.
1280 - Fix missed pool event emitter type export.
1281 - Fix typedoc documentation generation.
1283 ## [2.3.4] - 2022-10-17
1287 - Fully automate release process with release-it.
1291 - Optimize fair share task scheduling algorithm implementation.
1292 - Update benchmark versus external pools results with latest version.
1294 ## [2.3.3] - 2022-10-15
1298 - Add support for [cluster settings](https://nodejs.org/api/cluster.html#cluster_cluster_settings) in cluster pool options.
1300 ## [2.3.2] - 2022-10-14
1304 - Optimize fair share worker selection strategy implementation.
1308 - Fix WRR worker selection strategy: ensure the condition triggering the round robin can be fulfilled.
1310 ## [2.3.1] - 2022-10-13
1314 - Pool worker choice strategies:
1315 - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` strategy based on weighted round robin scheduling algorithm using tasks execution time for now.
1316 - `WorkerChoiceStrategies.FAIR_SHARE` strategy based on fair share scheduling algorithm using tasks execution time for now.
1318 ## [2.2.2] - 2022-10-09
1322 - Fixed `README.md` file.
1324 ## [2.2.1] - 2022-10-08
1328 - Dynamic worker choice strategy change at runtime.
1330 ## [2.2.0] - 2022-01-05
1332 ### Breaking Changes
1334 - Support only Node.js version 16.x.x for cluster pool: upstream cluster API have changed on that version.
1336 ## [2.1.0] - 2021-08-29
1340 - Add an optional pool option `messageHandler` to `PoolOptions<Worker>` for registering a message handler callback on each worker.
1342 ### Breaking Changes
1344 - `AbstractWorker` class `maxInactiveTime`, `killBehavior` and `async` attributes have been removed in favour of the same ones in the worker options `opts` public attribute.
1345 - `AbstractWorker` class `lastTask` attribute have been renamed to `lastTaskTimestamp`.
1346 - `AbstractWorker` class `interval` attribute have been renamed to `aliveInterval`.
1347 - `AbstractWorker` class cannot be instantiated without specifying the `mainWorker` argument referencing the main worker.
1349 ## [2.0.2] - 2021-05-12
1353 - Fix `busy` event emission on fixed pool type
1355 ## [2.0.1] - 2021-03-16
1359 - Check if pool options are properly set.
1360 - `busy` event is emitted on all pool types.
1362 ## [2.0.0] - 2021-03-01
1366 - Now a thread/process by default is not deleted when the task submitted take more time than maxInactiveTime configured (issue #70).
1368 ### Breaking Changes
1370 - `FullPool` event is now renamed to `busy`.
1371 - `maxInactiveTime` on `ThreadWorker` default behavior is now changed, if you want to keep the old behavior set `killBehavior` to `KillBehaviors.HARD`.
1372 _Find more details on our JSDoc._
1374 - `maxTasks` option on `FixedThreadPool` and `DynamicThreadPool` is now removed since is no more needed.
1376 - We changed some internal structures, but you shouldn't be too affected by them as these are internal changes.
1378 ### Pool options types declaration merge
1380 `FixedThreadPoolOptions` and `DynamicThreadPoolOptions` type declarations have been merged to `PoolOptions<Worker>`.
1382 #### New `export` strategy
1386 const DynamicThreadPool = require('poolifier/lib/dynamic')
1388 const { DynamicThreadPool } = require('poolifier/lib/dynamic')
1391 But you should always prefer just using
1394 const { DynamicThreadPool } = require('poolifier')
1397 #### New type definitions for input data and response
1399 For cluster worker and worker-thread pools, you can now only send and receive structured-cloneable data.
1400 _This is not a limitation by poolifier but Node.js._
1402 #### Public property replacements
1404 `numWorkers` property is now `numberOfWorkers`
1406 #### Internal (protected) properties and methods renaming
1408 These properties are not intended for end users
1410 - `id` => `nextMessageId`
1412 These methods are not intended for end users
1414 - `_chooseWorker` => `chooseWorker`
1415 - `_newWorker` => `createWorker`
1416 - `_execute` => `internalExecute`
1417 - `_chooseWorker` => `chooseWorker`
1418 - `_checkAlive` => `checkAlive`
1420 - `_runAsync` => `runAsync`
1422 ## [1.1.0] - 2020-05-21
1426 - ThreadWorker support async functions as option
1427 - Various external library patches
1429 ## [1.0.0] - 2020-01-24
1433 - FixedThreadPool implementation
1434 - DynamicThreadPool implementation
1435 - WorkerThread implementation to improve developer experience