MongoDB SSD incident postmortem

Ruby 3.1.2 vs 3.3.5+YJIT in production In the previous article I discussed about my upgrade process from Ruby 3.1 to ruby 3.3, discovered a potential regression in a specific scenario, and ended up with synthetic benchmark results looking pretty great: Basically much higher performance thanks to YJIT, with an even lower memory usage then before,...

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...

A lot of people are wondering about the technical stack used by updown.io and more generaly by one-man tech companies. A while back (2016) I filled up this information on StackShare. I haven't kept it up-to-date and I don't like to have to maintain yet another third party documentation so it's unlikely I'll update it again. Though it changes very...

This investigation was surprising to me so I thought it would be interesting to share my findings and I hope you'll like it. Some of my clients occasionally reported that the updown confirmation email (used to confirm a new email address, provided by Devise) had been classified as spam, we're talking about this one: Doesn't look too spammy so far...

I wanted to improve the responsiveness of the Delete account action, which could be slow for bigger/older accounts due to the many associated records to be destroyed (downtimes, metrics) being sparsely distributed in the database. This sounded like a wonderfully perfect use-case for the recent dependent: :destroy_async option added in Rails 6.1....