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Demystifying Ruby: It's all about threads (2024)

Is Ruby a true parallel language ?!

The MRI implements the G lobal I nterpreter L ock, a mechanism to ensure that one and only one thread runs at the same time effectively limiting true parallelism. As every other concept highlighted in this blog post, you should consider Fiber as a very low level interface and I would avoid building a lot of code based on them. Processes offer full memory isolation and can run in parallel across CPU cores, making them great for tasks that need complete separation but are resource-heavy.

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