Poolifier is used to perform CPU and/or I/O intensive tasks on Deno, Bun or
browser, it implements worker pools using
web worker API
module.
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 general guidelines.
- Easy to use ✔
- Fixed and dynamic pool size ✔
- Easy switch from a pool type to another ✔
- Performance benchmarks ✔
- Zero cost abstraction for multiple JS runtime support ✔
- No runtime dependencies ✔
- Support for ESM and TypeScript ✔
- Support for web worker API module ✔
- Tasks distribution strategies ✔
- Lockless tasks queueing ✔
- Queued tasks rescheduling:
- Task stealing on idle ✔
- Tasks stealing under back pressure ✔
- Tasks redistribution on worker error ✔
- Support for sync and async task function ✔
- Support for multiple task functions with per task function queuing priority and tasks distribution strategy ✔
- Support for task functions CRUD operations at runtime ✔
- General guidelines on pool choice ✔
- Error handling out of the box ✔
- Widely tested ✔
- Active community ✔
- Code quality
- Code security
- Overview
- Usage
- Deno and Bun versions
- API
- General guidelines
- Worker choice strategies
- Contribute
- Team
- License
Poolifier contains
web worker
pool implementation, you don't have to deal with
web worker API
complexity.
The first implementation is a fixed 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 newly created workers will be stopped
after a configurable period of inactivity.
You have to implement your worker by extending the ThreadWorker class.
deno add @poolifier/poolifier-web-worker
See Deno examples for more details:
bun add poolifier-web-worker
bunx jsr add @poolifier/poolifier-web-worker
See Bun examples for more details:
<script type="module">import { ThreadWorker } from 'https://cdn.jsdelivr.net/npm/poolifier-web-worker@0.4.26/browser/mod.js'</script>
<script type="module">
import {
availableParallelism,
DynamicThreadPool,
FixedThreadPool,
PoolEvents,
} from 'https://cdn.jsdelivr.net/npm/poolifier-web-worker@0.4.26/browser/mod.js'
</script>
You can implement a poolifier web worker in a simple way by extending the class ThreadWorker:
// adapt import to the targeted JS runtime
import { ThreadWorker } from '@poolifier/poolifier-web-worker'
function yourFunction(data) {
// this will be executed in the worker thread,
// the data will be received by using the execute method
return { ok: 1 }
}
export default new ThreadWorker(yourFunction, {
maxInactiveTime: 60000,
})
Instantiate your pool based on your needs :
// adapt import to the targeted JS runtime
import {
availableParallelism,
DynamicThreadPool,
FixedThreadPool,
PoolEvents,
} from '@poolifier/poolifier-web-worker'
// a fixed web worker pool
const pool = new FixedThreadPool(
availableParallelism(),
new URL('./yourWorker.js', import.meta.url),
{
errorEventHandler: (e) => {
console.error(e)
},
},
)
pool.eventTarget?.addEventListener(
PoolEvents.ready,
() => console.info('Pool is ready'),
)
pool.eventTarget?.addEventListener(
PoolEvents.busy,
() => console.info('Pool is busy'),
)
// or a dynamic web worker pool
const pool = new DynamicThreadPool(
Math.floor(availableParallelism() / 2),
availableParallelism(),
new URL('./yourWorker.js', import.meta.url),
{
errorEventHandler: (e) => {
console.error(e)
},
},
)
pool.eventTarget?.addEventListener(
PoolEvents.full,
() => console.info('Pool is full'),
)
pool.eventTarget?.addEventListener(
PoolEvents.ready,
() => console.info('Pool is ready'),
)
pool.eventTarget?.addEventListener(
PoolEvents.busy,
() => console.info('Pool is busy'),
)
// the execute method signature is the same for both implementations,
// so you can easily switch from one to another
try {
const res = await pool.execute()
console.info(res)
} catch (err) {
console.error(err)
}
Remember that workers can only send and receive structured-cloneable data.
- Deno versions >= 1.40.x are supported.
- Bun versions >= 1.x are supported.
Choose your task here, propose an idea, a fix, an improvement.
See CONTRIBUTING guidelines.
Creator/Owner:
Maintainers:
Contributors: