A practical guide to Ruby's concurrency primitives beyond fibers, covering Threads, Ractors, and how to achieve true parallel execution in Ruby applications.

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A practical guide to Ruby's concurrency primitives beyond Fibers, covering Threads, Ractors, and the Async gem. Explains the Global Virtual Machine Lock (GVL) and its impact on parallelism, when each primitive is appropriate, and how to combine them for mixed workloads. Includes a comparison table of Fibers, Threads, and Ractors by memory usage, parallelism, and use case, plus a decision guide for choosing the right approach.

Ruby Concurrency Beyond Fibers: Threads, Ractors, and True Parallelism