When is NodeJS Single Threaded and when ...

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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