<div align="center">
-<img src="./images/logo.png" width="340px" height="266px"/>
+
<img src="./images/logo.png" width="340px" height="266px"/>
</div>
<h2 align="center">Node Thread Pool and Cluster Pool :arrow_double_up: :on:</h2>
<p align="center">
<a href="https://www.npmjs.com/package/poolifier">
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+ <a href="https://github.com/poolifier/poolifier/actions/workflows/ci.yml">
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<a href="https://sonarcloud.io/dashboard?id=pioardi_poolifier">
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- <a href="https://sonarcloud.io/component_measures/metric/coverage/list?id=pioardi_poolifier">
+ <a href="https://sonarcloud.io/dashboard?id=pioardi_poolifier">
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## Why Poolifier?
-Poolifier is used to perform CPU intensive and I/O intensive tasks on nodejs servers, it implements worker pools (yes, more worker pool implementations, so you can choose which one fit better for you) using [worker-threads](https://nodejs.org/api/worker_threads.html#worker_threads_worker_threads) and cluster pools using [Node.js cluster](https://nodejs.org/api/cluster.html) modules.
+Poolifier is used to perform CPU intensive and I/O intensive tasks on nodejs servers, it implements worker pools using [worker-threads](https://nodejs.org/api/worker_threads.html#worker_threads_worker_threads) and cluster pools using [Node.js cluster](https://nodejs.org/api/cluster.html) modules.
With poolifier you can improve your **performance** and resolve problems related to the event loop.
Moreover you can execute your tasks using an API designed to improve the **developer experience**.
-Please consult our <a href="#general-guidance">general guidelines</a>
+Please consult our [general guidelines](#general-guidance).
- Performance :racehorse: [benchmarks](./benchmarks/README.md)
- Security :bank: :cop: [](https://sonarcloud.io/dashboard?id=pioardi_poolifier) [](https://sonarcloud.io/dashboard?id=pioardi_poolifier)
- Easy to use :couple:
-- Easy switch from a pool to another, easy to tune :white_check_mark:
- Dynamic pool size :white_check_mark:
+- Easy switch from a pool to another :white_check_mark:
- No runtime dependencies :white_check_mark:
- Proper async integration with node async hooks :white_check_mark:
- Support for worker threads and cluster node modules :white_check_mark:
- Support sync and async tasks :white_check_mark:
+- Tasks distribution strategies :white_check_mark:
- General guidance on pools to use :white_check_mark:
- Widely tested :white_check_mark:
- Error handling out of the box :white_check_mark:
Node pool contains two [worker-threads](https://nodejs.org/api/worker_threads.html#worker_threads_worker_threads)/[cluster worker](https://nodejs.org/api/cluster.html#cluster_class_worker) pool implementations, you don't have to deal with worker-threads/cluster worker complexity.
The first implementation is a static worker pool, with a defined number of workers that are started at creation time and will be reused.
The second implementation is a dynamic worker pool with a number of worker started at creation time (these workers will be always active and reused) and other workers created when the load will increase (with an upper limit, these workers will be reused when active), the new created workers will be stopped after a configurable period of inactivity.
-You have to implement your worker extending the ThreadWorker or ClusterWorker class
+You have to implement your worker extending the ThreadWorker or ClusterWorker class.
## Installation
}
module.exports = new ThreadWorker(yourFunction, {
- maxInactiveTime: 60000,
- async: false
+ maxInactiveTime: 60000
})
```
-Instantiate your pool based on your needed :
+Instantiate your pool based on your needs :
```js
'use strict'
You can do the same with the classes ClusterWorker, FixedClusterPool and DynamicClusterPool.
-**See examples folder for more details (in particular if you want to use a pool for [multiple functions](./examples/multiFunctionExample.js)).**
-**Now TypeScript is also supported, find how to use it into the example folder**.
+**See examples folder for more details (in particular if you want to use a pool with [multiple worker functions](./examples/multiFunctionExample.js))**.
Remember that workers can only send and receive serializable data.
## Node versions
-Node versions >= 16.x are supported.
+Node versions >= 16.14.x are supported.
-## API
+## [API](https://poolifier.github.io/poolifier/)
-### [Documentation](https://poolifier.github.io/poolifier/)
+### Pool options
-### `pool = new FixedThreadPool/FixedClusterPool(numberOfThreads/numberOfWorkers, filePath, opts)`
-
-`numberOfThreads/numberOfWorkers` (mandatory) Number of workers for this pool
-`filePath` (mandatory) Path to a file with a worker implementation
-`opts` (optional) An object with these properties:
+An object with these properties:
- `messageHandler` (optional) - A function that will listen for message event on each worker
- `errorHandler` (optional) - A function that will listen for error event on each worker
- `exitHandler` (optional) - A function that will listen for exit event on each worker
- `workerChoiceStrategy` (optional) - The worker choice strategy to use in this pool:
- - `WorkerChoiceStrategies.ROUND_ROBIN`: Submit tasks to worker in a round robbin fashion
- - `WorkerChoiceStrategies.LESS_USED`: Submit tasks to the less used worker
- - `WorkerChoiceStrategies.LESS_BUSY`: Submit tasks to the less busy worker
- - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN`: Submit tasks to worker using a weighted round robin scheduling algorithm based on tasks execution time
- - `WorkerChoiceStrategies.FAIR_SHARE`: Submit tasks to worker using a fair share tasks scheduling algorithm based on tasks execution time
+ - `WorkerChoiceStrategies.ROUND_ROBIN`: Submit tasks to worker in a round robin fashion
+ - `WorkerChoiceStrategies.LEAST_USED`: Submit tasks to the worker with the minimum number of executed, executing and queued tasks
+ - `WorkerChoiceStrategies.LEAST_BUSY`: Submit tasks to the worker with the minimum tasks total execution and wait time
+ - `WorkerChoiceStrategies.LEAST_ELU`: Submit tasks to the worker with the minimum event loop utilization (ELU) (experimental)
+ - `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN`: Submit tasks to worker by using a weighted round robin scheduling algorithm based on tasks execution time
+ - `WorkerChoiceStrategies.INTERLEAVED_WEIGHTED_ROUND_ROBIN`: Submit tasks to worker by using an interleaved weighted round robin scheduling algorithm based on tasks execution time (experimental)
+ - `WorkerChoiceStrategies.FAIR_SHARE`: Submit tasks to worker by using a fair share tasks scheduling algorithm based on tasks execution time or ELU
- `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN` and `WorkerChoiceStrategies.FAIR_SHARE` strategies are targeted to heavy and long tasks
+ `WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN`, `WorkerChoiceStrategies.INTERLEAVED_WEIGHTED_ROUND_ROBIN` and `WorkerChoiceStrategies.FAIR_SHARE` strategies are targeted to heavy and long tasks.
Default: `WorkerChoiceStrategies.ROUND_ROBIN`
- `workerChoiceStrategyOptions` (optional) - The worker choice strategy options object to use in this pool.
Properties:
- - `medRunTime` (optional) - Use the tasks median run time instead of the tasks average run time in worker choice strategies.
+ - `measurement` (optional) - The measurement to use in worker choice strategies: `runTime`, `waitTime` or `elu`.
+ - `runTime` (optional) - Use the tasks median runtime instead of the tasks average runtime in worker choice strategies.
+ - `waitTime` (optional) - Use the tasks median wait time instead of the tasks average wait time in worker choice strategies.
+ - `elu` (optional) - Use the tasks median ELU instead of the tasks average ELU in worker choice strategies.
+ - `weights` (optional) - The worker weights to use in the weighted round robin worker choice strategy: `{ 0: 200, 1: 300, ..., n: 100 }`.
- Default: { medRunTime: false }
+ Default: `{ runTime: { median: false }, waitTime: { median: false }, elu: { median: false } }`
-- `enableEvents` (optional) - Events emission enablement in this pool. Default: true
-- `enableTasksQueue` (optional) - Tasks queue per worker enablement in this pool. Default: false
+- `restartWorkerOnError` (optional) - Restart worker on uncaught error in this pool.
+ Default: `true`
+- `enableEvents` (optional) - Events emission enablement in this pool.
+ Default: `true`
+- `enableTasksQueue` (optional) - Tasks queue per worker enablement in this pool.
+ Default: `false`
- `tasksQueueOptions` (optional) - The worker tasks queue options object to use in this pool.
Properties:
- `concurrency` (optional) - The maximum number of tasks that can be executed concurrently on a worker.
- Default: { concurrency: 1 }
+ Default: `{ concurrency: 1 }`
+
+#### Thread pool specific options
+
+- `workerOptions` (optional) - An object with the worker options. See [worker_threads](https://nodejs.org/api/worker_threads.html#worker_threads_new_worker_filename_options) for more details.
+
+#### Cluster pool specific options
+
+- `env` (optional) - An object with the environment variables to pass to the worker. See [cluster](https://nodejs.org/api/cluster.html#cluster_cluster_fork_env) for more details.
+
+- `settings` (optional) - An object with the cluster settings. See [cluster](https://nodejs.org/api/cluster.html#cluster_cluster_settings) for more details.
+
+### `pool = new FixedThreadPool/FixedClusterPool(numberOfThreads/numberOfWorkers, filePath, opts)`
+
+`numberOfThreads/numberOfWorkers` (mandatory) Number of workers for this pool
+`filePath` (mandatory) Path to a file with a worker implementation
+`opts` (optional) An object with the pool options properties described above
### `pool = new DynamicThreadPool/DynamicClusterPool(min, max, filePath, opts)`
`min` (mandatory) Same as FixedThreadPool/FixedClusterPool numberOfThreads/numberOfWorkers, this number of workers will be always active
`max` (mandatory) Max number of workers that this pool can contain, the new created workers will die after a threshold (default is 1 minute, you can override it in your worker implementation).
-`filePath` (mandatory) Same as FixedThreadPool/FixedClusterPool
-`opts` (optional) Same as FixedThreadPool/FixedClusterPool
+`filePath` (mandatory) Path to a file with a worker implementation
+`opts` (optional) An object with the pool options properties described above
-### `pool.execute(data)`
+### `pool.execute(data, name)`
-Execute method is available on both pool implementations (return type: Promise):
-`data` (mandatory) An object that you want to pass to your worker implementation
+`data` (optional) An object that you want to pass to your worker implementation
+`name` (optional) A string with the task function name that you want to execute on the worker. Default: `'default'`
+This method is available on both pool implementations and returns a promise.
### `pool.destroy()`
### `class YourWorker extends ThreadWorker/ClusterWorker`
-`fn` (mandatory) The function that you want to execute on the worker
+`taskFunctions` (mandatory) The task function or task functions object that you want to execute on the worker
`opts` (optional) An object with these properties:
-- `maxInactiveTime` - Max time to wait tasks to work on (in ms), after this period the new worker will die.
+- `maxInactiveTime` (optional) - Max time to wait tasks to work on in milliseconds, after this period the new worker will die.
The last active time of your worker unit will be updated when a task is submitted to a worker or when a worker terminate a task.
If `killBehavior` is set to `KillBehaviors.HARD` this value represents also the timeout for the tasks that you submit to the pool, when this timeout expires your tasks is interrupted and the worker is killed if is not part of the minimum size of the pool.
If `killBehavior` is set to `KillBehaviors.SOFT` your tasks have no timeout and your workers will not be terminated until your task is completed.
- Default: 60000 ms
+ Default: `60000`
-- `async` - true/false, true if your function contains async code pieces, else false
-- `killBehavior` - Dictates if your async unit (worker/process) will be deleted in case that a task is active on it.
- **KillBehaviors.SOFT**: If `currentTime - lastActiveTime` is greater than `maxInactiveTime` but a task is still running, then the worker **won't** be deleted.
- **KillBehaviors.HARD**: If `currentTime - lastActiveTime` is greater than `maxInactiveTime` but a task is still running, then the worker will be deleted.
+- `killBehavior` (optional) - Dictates if your async unit (worker/process) will be deleted in case that a task is active on it.
+ **KillBehaviors.SOFT**: If `currentTime - lastActiveTime` is greater than `maxInactiveTime` but a task is still executing, then the worker **won't** be deleted.
+ **KillBehaviors.HARD**: If `currentTime - lastActiveTime` is greater than `maxInactiveTime` but a task is still executing, then the worker will be deleted.
This option only apply to the newly created workers.
Default: `KillBehaviors.SOFT`
**If your task runs on libuv thread pool**, you can try to:
-- Tune the libuv thread pool size setting the [UV_THREADPOOL_SIZE](https://nodejs.org/api/cli.html#cli_uv_threadpool_size_size)
+- Tune the libuv thread pool size setting the [UV_THREADPOOL_SIZE](https://nodejs.org/api/cli.html#cli_uv_threadpool_size_size).
and/or
-- Use poolifier cluster pool that spawning child processes will also increase the number of libuv threads since that any new child process comes with a separated libuv thread pool. **More threads does not mean more fast, so please tune your application.**
+- Use poolifier cluster pool that spawning child processes will also increase the number of libuv threads since that any new child process comes with a separated libuv thread pool. **More threads does not mean more fast, so please tune your application**.
### Cluster vs Threads worker pools
Cluster pools are built on top of Node.js [cluster](https://nodejs.org/api/cluster.html) module.
If your task contains code that runs on libuv plus code that is CPU intensive or I/O intensive you either split it either combine more strategies (i.e. tune the number of libuv threads and use cluster/thread pools).
-But in general, **always profile your application**
+But in general, **always profile your application**.
### Fixed vs Dynamic pools
Increasing the memory footprint, your application will be ready to accept more tasks, but during idle time your application will consume more memory.
One good choose from my point of view is to profile your application using Fixed/Dynamic worker pool, and to see your application metrics when you increase/decrease the num of workers.
For example you could keep the memory footprint low choosing a DynamicThreadPool/DynamicClusterPool with 5 workers, and allow to create new workers until 50/100 when needed, this is the advantage to use the DynamicThreadPool/DynamicClusterPool.
-But in general, **always profile your application**
+But in general, **always profile your application**.
## Contribute
-See guidelines [CONTRIBUTING](CONTRIBUTING.md)
-Choose your task here [2.4.x](https://github.com/orgs/poolifier/projects/1), propose an idea, a fix, an improvement.
+Choose your task here [2.5.x](https://github.com/orgs/poolifier/projects/1), propose an idea, a fix, an improvement.
+
+See [CONTRIBUTING](CONTRIBUTING.md) guidelines.
## Team
repositories / poolifier.git / blobdiff