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Ruby & Rails Ruby
Multi-Threading
https://www.speedshop.co/2020/05/11/the-ruby-gvl-and-scaling.html
https://docs.ruby-lang.org/en/master/Thread.html
https://docs.ruby-lang.org/en/master/ractor_md.html
https://www.youtube.com/watch?v=Y29SSOS4UOc
https://www.wjwh.eu/posts/2020-12-28-ruby-fiber-scheduler-c-extension.html
https://github.com/socketry/async/blob/main/lib/async/scheduler.rb
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