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Puma

Puma is a simple, fast, threaded, and highly concurrent HTTP server for Ruby/Rack applications.

Unicorn

A unicorn is a magical weaponized HTTP server for Ruby.



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Example

Puma will tend to optimize itself by spawning more threads and its performance should range from no worse than unicorn in the pure cpu case to being vastly better than unicorn in the case of an app that sleeps a lot

from question  

What do multi-processes VS multi-threaded servers most benefit from?

It uses less resources than unicorn but has more requirements to your code it better be thread-safe because puma is a threaded server

from question  

OS X: Development & Production Deployment for RoR with Apache and Passenger

For example it looks like unicorn is a better choice on heroku than puma

from question  

Memory quota exceeded in my heroku deployed rails app

Puma can spawn many workers and each worker can use many threads to process the request;unicorn does not have threads as far as i know it just has the worker model

from question  

What is the difference between Workers and Threads in Puma

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