Node.js Eventloop & Worker Pool

https://www.youtube.com/watch?v=PNa9OMajw9w

https://www.youtube.com/watch?v=P9csgxBgaZ8

https://www.youtube.com/watch?v=zphcsoSJMvM

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

https://medium.com/the-node-js-collection/what-you-should-know-to-really-understand-the-node-js-event-loop-and-its-metrics-c4907b19da4c

Worker Pool

Worker Pool: 4 threads by default.

These are the Node module APIs that make use of the Worker Pool:

1. I/O-intensive
   1. DNS: dns.lookup(), dns.lookupService().
   2. File System: All file system APIs except fs.FSWatcher() and those that are explicitly synchronous use libuv's threadpool.
2. CPU-intensive
   1. Crypto: crypto.pbkdf2(), crypto.scrypt(), crypto.randomBytes(), crypto.randomFill(), crypto.generateKeyPair().
   2. Zlib: All zlib APIs except those that are explicitly synchronous use libuv's threadpool.