A proposal of new concurrency model for Ruby 3 Koichi Sasada ko1@heroku.com People love “Concurrency” Concurrent RubyKaigi (at least, there are two parallel sessions) Why people love (to discuss) “Concurrency”? •Performance by “Parallel” execution to utilize multiple-cores About this presentation •Show “Why difficult multi-threads programs” •Propose new concurrent and parallel mechanism idea name