Weird results comparing ruby 3.1, 3.2 & 3.3 with jemalloc and YJIT

updown.io has been running on ruby 3.1 since... git log -p .ruby-version ... August 2022 so for slighly over 2 years now. More specifically ruby 3.1.2 with jemalloc for better performance . Note: I am not using YJIT in production yet, as my benchmark in 3.1.2 for updown.io daemon code showed a mere 5-10% CPU time performance increase, but with more than 30% memory increase. And after a few days of…