RailsConf 2017: Your App Server Config is Wrong by Nate Berkopec

The question I needed more answers on was the processor to worker count, and you gave very little.
Thanks for the memory information though. It confirmed that I our application setup correctly. Chugging along serving about 150k users. Almost zero maintenance required.

This talk helped me a lot, by calc and change setting discussed here I've got lower memory usage with 30% response time improvements.