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Dealing with Ruby Threads is tricky. And add to that understanding the GIL, and thread unsafeness and its pretty subtle!
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Need faster code? Try Multithreading – Hacker Noon
More nice information about multithreading and concurrency in Ruby
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How to Choose Your Ruby Interpreters and Runtimes | Toptal
What the different runtimes do different. It might be a little dated but its still good.