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Fine-Grained Concurrency for Ruby

Ruby gem Tests MIT License


Polyphony | pəˈlɪf(ə)ni |

  1. Music the style of simultaneously combining a number of parts, each forming an individual melody and harmonizing with each other.
  2. Programming a Ruby gem for concurrent programming focusing on performance and developer happiness.

What is Polyphony

Polyphony is a library for building concurrent applications in Ruby. Polyphony harnesses the power of Ruby fibers to provide a cooperative, sequential coroutine-based concurrency model. Under the hood, Polyphony uses io_uring or libev to maximize I/O performance.


  • Co-operative scheduling of concurrent tasks using Ruby fibers.
  • High-performance event reactor for handling I/O events and timers.
  • Natural, sequential programming style that makes it easy to reason about concurrent code.
  • Abstractions and constructs for controlling the execution of concurrent code: supervisors, cancel scopes, throttling, resource pools etc.
  • Code can use native networking classes and libraries, growing support for third-party gems such as pg and redis.
  • Use stdlib classes such as TCPServer, TCPSocket and OpenSSL::SSL::SSLSocket.
  • Competitive performance and scalability characteristics, in terms of both throughput and memory consumption.


The complete documentation for Polyphony could be found on the Polyphony website.

Contributing to Polyphony

Issues and pull requests will be gladly accepted. Please use the Polyphony git repository as your primary point of departure for contributing.