Ruby Ractors and YJIT: A Concurrency Performance Deep Dive
2025-03-26
This post explores the true concurrency capabilities of Ruby Ractors in version 3.4.2 and unexpectedly discovers the impressive performance gains offered by YJIT. Benchmarks using Fibonacci and Tarai functions reveal that Ractors effectively utilize multiple cores on native macOS, but underperform in Docker. However, enabling YJIT significantly improves performance in both environments, exceeding expectations. The author concludes that Ractors are not yet production-ready, but YJIT is production-ready and provides substantial performance improvements.
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