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

The Backend Engineering Show with Hussein Nasser

English - March 24, 2021 03:08 - 9 minutes - 6.25 MB - ★★★★★ - 5 ratings
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Node JS Is single-threaded asynchronous non-blocking javascript runtime, but it's 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 Loop single thread, that really just loops for callbacks 0:00
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)

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