When is NodeJS Single-Threaded and when is it Multi-Threaded?

Node JS Is single threaded asynchronous non-blocking javascript runtime, but its not always single threaded there are occasions where nodejs uses multi-threading, so the questions we will try to answer in this video, when is nodejs single threaded and when does it use multi-threading and how will that affect my app?

* Event main Loop 0:00 single thread, that really just loops for callbacks
* Threading in Node jS (libuv) 4:00
* used for
* IO/intensive
* DNS queries
* file system reads
* CPU intensive
* crypto
* compression
* process.env.UV_THREADPOOL_SIZE=1

Examples 8:00
Cluster Nodejs 16:00
Example 1
Http server return 1
Http server while 1
Http server with file system read async
Http server with file system read sync
Http server with fetch call to server (dns)

Resources

https://nodejs.org/en/docs/guides/dont-block-the-event-loop/

http://docs.libuv.org/en/v1.x/index.html

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Видео When is NodeJS Single-Threaded and when is it Multi-Threaded? канала Hussein Nasser