Recommended concurrency limits for a Rails app using websockets

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Hi all.

My Rails uses ActionCable for websockets and each Fly machine has 3 Puma workers with 5 threads each. Websockets are used a lot and and realtime features are among the most important features of the app. Each

What would be the recommended request concurrency limits for this configuration? Thanks!

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Rails recommends standalone servers in production: Action Cable Overview — Ruby on Rails Guides

If you follow those recommendations, you can keep a low number of puma workers per rails server (note: Rails currently recommends three, not five, Why Did Rails' Puma Config Change?! gives an in-depth description of the reason for the change), and have a separate limit for websockets (I’ve run tests, and 500 doesn’t seem to be a problem).

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Thanks for your reply. In the meantime I switched to Hetzner with Kamal. It’s much cheaper and performance is much better.

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