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<p align="center">
<img src="http://puma.io/images/logos/puma-logo-large.png">
</p>
# Puma: A Ruby Web Server Built For Concurrency
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## Description
Puma is a simple, fast, threaded, and highly concurrent HTTP 1.1 server for Ruby/Rack applications in development and production.
Puma is a **simple, fast, threaded, and highly concurrent HTTP 1.1 server for Ruby/Rack applications** in development and production.
## Built For Speed &amp; Concurrency
Puma is a simple, fast, and highly concurrent HTTP 1.1 server for Ruby web applications. It can be used with any application that supports Rack. It was designed to be the go-to server for [Rubinius](http://rubini.us), but also works well with JRuby and MRI.
Under the hood, Puma processes requests using a C-optimized Ragel extension (inherited from Mongrel) that provides fast, accurate HTTP 1.1 protocol parsing in a portable way. Puma then serves the request in a thread from an internal thread pool. Since each request is served in a separate thread, truly concurrent Ruby implementations (JRuby, Rubinius) will use all available CPU cores.
Puma was designed to be the go-to server for [Rubinius](http://rubini.us), but also works well with JRuby and MRI.
On MRI, there is a Global VM Lock (GVL) that ensures only one thread can run Ruby code at a time. But if you're doing a lot of blocking IO (such as HTTP calls to external APIs like Twitter), Puma still improves MRI's throughput by allowing blocking IO to be run concurrently.
## Quick Start