Unlocking Ruby Ractor Performance: Eliminating Class Variable Contention

This post delves into a performance bottleneck in Ruby's Ractors when dealing with class instance variables. The global interpreter lock causes significant performance degradation when multiple Ractors concurrently access these variables. The author meticulously analyzes the underlying implementation of class instance variables and proposes a solution using object delegation to eliminate lock contention, resulting in a nearly threefold performance improvement in microbenchmarks. This solution also unexpectedly fixes a bug and performance regression introduced by the new Namespace feature.