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by the_unproven
2375 days ago
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Events can handle much more connections than a thread based approach. For example nginx is implemented with event-driven architecture: https://www.nginx.com/blog/inside-nginx-how-we-designed-for-... > NGINX scales very well to support hundreds of thousands of connections per worker process. Each new connection creates another file descriptor and consumes a small amount of additional memory in the worker process. There is very little additional overhead per connection. NGINX processes can remain pinned to CPUs. Context switches are relatively infrequent and occur when there is no work to be done. > In the blocking, connection‑per‑process approach, each connection requires a large amount of additional resources and overhead, and context switches (swapping from one process to another) are very frequent. This is their explanation on events vs threading approach. Still, a lot of web servers today use a thread-per-connection which is acceptable since a database(e.g. postgres) performance degrades slowly as more active connections are introduced.[1] [1] https://brandur.org/postgres-connections |
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