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CRuby threads don't give you real parallelism, the GVL blocks it.

by Giménez Silva Germán Alberto —

https://rubystacknews.com/2026/05/14/ractors-real-parallelism-in-ruby-without-the-gvl/

Ractors (Ruby 3.0+) fix this by holding a GVL per ractor, not one global lock.

The catch: objects can’t be shared freely. That’s not a bug, it’s the guarantee that makes data races impossible between ractors.

Full breakdown → rubystacknews.com

Ruby #Concurrency #RubyOnRails

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