Happy holidays from RBQ Conf. We’re grateful for all the early support, and excited to share our keynote speakers for March. CFP is open for two more weeks if you’d like to join them on stage. Rare tickets are still available. Details at rbqconf.com

RubyGems/Bundler 4.0.1 is out now: blog.rubygems.org/2025/12/09/4...

Would you like to help shape the RubyConf 2026 program? @rubycentral.org is looking for interested to register through this form. docs.google.com/forms/d/e/1F...

Letting Puma auto-set your worker count is the easiest way to go for 90% of usecases. Currently, you can only do that with WEB_CONCURRENCY=auto, but we'll also make this possible in the next puma version by using `workers :auto` in your puma.rb.

Our README Newsletter returns! Click through for exciting updates on RubyConf 2026 (including our Program Committee application!), upcoming Ruby events, and holiday closure dates for Ruby Central. mailchi.mp/eab24303db59...

If you are using Concurrent.physical_processor_count or Concurrent.processor_count to set your Puma/Unicorn worker counts, that is wrong. Use Concurrent.available_processor_count. It takes into account cpu quotas in envs like k8s/docker.

RBQ Conf is officially cookin’. Our CFP is open, and we’re looking for sponsors who want to support a warm, community-first Ruby gathering in Austin. If you’ve got a meaty idea to share—or want to help bring year one to life—we’d love to hear from you. rbqconf.com

Related to some recent news related to unwrap() usage, enjoy this short post about using `clippy.toml` to make your code safer #rust #rustlang www.schneems.com/2025/11/19/f...

“We adopted #rustlang for its security and are seeing a 1000x reduction in memory safety vulnerability density ... with Rust changes having a 4x lower rollback rate and spending 25% less time in code review, the safer path is now also the faster one.” security.googleblog.com/2025/11/rust...

where my rubyists (old people) at??

Ruby Central has opened board applications for next year: rubycentral.teamtailor.com/jobs/6723164... I’ll be rolling off the board to have another baby and stuff, so I’d really love if you’d apply and/or share this with anyone who’s interested in being involved.

Your #Ruby apps are now keep-alive ready! The years-long bug in Puma 6 has now been fixed, and we detail the architectural changes made to address it and how things should now speed up for you: https://sforce.co/47xdaMA

I wrote about what we changed in Puma 7 to get rid of those no-good line-cutting keep-alive thread-monopolizing connections. #ruby #rails www.heroku.com/blog/upgrade...

I wrote an explainer on TCP slow start and Keep-alive connections. Learn more about HTTP/1.1 and some concepts that power Puma and most modern web servers www.heroku.com/blog/learn-h... #ruby #rails

The most valuable part of docs is the example. The worst part of an example is if it is wrong. A doc test solves both these problems. I want a default gem that all libraries can use. A standard for shipping examples with docs that are guaranteed to work

‘s about time to hit the road. Until next time #Austin.

I am out in nature and on a farm. A bug just flew right at me and hit me in the face I just can’t get away from software it seems

I see a future in #jj-vcs: steveklabnik.com/writing/i-se...

I had three people from Brazil on a call recently because they wanted to start contributing to Puma but were unsure of where to start. This is something I've done for years and I've always loved it. We sometimes get really important new contributors from these convos.

Environment variable based configuration for CLI tools and frameworks is handy: E.g. “BUNDLE_PATH=lol bundle install” is equivalent to “bundle install —path lol” I’m looking for non-Ruby tools that have behavior like this. I’m curious how they support boolean values or special cases like infinity.

The next Rails World is Austin

ruby.social/@Schneems/11... #cli #ruby #bundler #ux

I took a journey into the heart of Ruby to learn the secrets of the /o regex modifier, and I emerged wiser, but also so deeply tired. jpcamara.com/2025/08/02/t...

Puma 7.0.0.pre1 was just released with a fix for the keepalive behavior that's been causing issues with Heroku Router 2.0 Please if you can try running this pre-release and report issues if you find them. #ruby rubygems.org/gems/puma/ve...

A lot of people in our CGRP Slack community are having issues with Router 2.0 on Heroku. I initially thought this was more Puma/keepalive problems but actually we're seeing it with Falcon, Anycable, and Puma with keepalives disabled too!

Scrap Chef is looking for a developer or data scientist in Austin to be a forward deployed engineer. Great opportunity to be hands on with AI for real use cases in an industry that needs it. As they say: "You’re essentially the CTO of a deployment"

Is #rustlang faster than C? steveklabnik.com/writing/is-r...

Fabulousness from @raprevec.bsky.social. ;)

Oh man I've heard the "it can't be done" line from platform and security engineers more times than I want to think about. Gonna steal this. "don't mcblock me" by @schneems.bsky.social www.schneems.com/2025/06/03/d... #software #engineering #devops

New blog post about how "absolutes" in tech conversations turn into blockers and what to do about it instead: "Don't McBlock Me" www.schneems.com/2025/06/03/d...

Heroku's CLI provides machine readable output on a lot of commands. This allows us to rev the text UI without needing to worry about breaking people scripting. I’m suggesting we add a similar pattern with Bundler starting with “bundle list —json”. #ruby github.com/rubygems/rub...

I published a post yesterday but I forgot to post about the post. Here's an article about speeding up object allocations in Ruby 3.5! railsatscale.com/2025-05-21-f...

Do you know any tools (or hacked scripts) for programmatically generating asciinema.org videos (or similar)? As in: I want to automate as if someone is typing in `git push heroku` and record the typing, and the resulting stream and give me the finished result.

Ruby 3.4.4 Released www.ruby-lang.org/en/news/2025... This release includes a fix for a YJIT bug related to local variables and addresses a build issue on Windows when using GCC 15. It was released ahead of schedule to make these fixes available as soon as possible.

Great article. > Further, I advocate for Rust developers to document and share their mistakes in the hope that we can all learn from them. Couldn’t agree more.

To better understand what makes a good #rust type, I'm exploring what makes a "bad type" with the first in my series "The Duplicate Duck." LMK what you think and if you have any other type anti-patterns I should watch out for. www.schneems.com/2025/05/07/b...

Baby’s first masters degree (Georgia Tech Masters in computer science)

Sweating the April 30 deadline to migrate your Ruby app off of Heroku-20? I wrote a few words that might help blog.heroku.com/migrating-ru...

This great piece -- based on the conversation that @ahl.bsky.social and I had with @sunshowers.io -- leaves me with many thoughts, but first among them: the Rust community is really extraordinary.

Learn how the Daft crate implements the ability to emit code and errors simultaneously and how they accumulate as many errors as possible for an improved Derive proc-macro experience. #rust www.schneems.com/2025/03/26/a...

Does unsafe undermine #rustlang 's guarantees? steveklabnik.com/writing/does...

Learn a bit about how native extensions work and how to fix "Error 1" when installing the sassc gem on your mac. I hope you enjoy reading it half as much as I enjoyed writing it. #ruby www.schneems.com/2025/03/17/i...

Howdy. It’s me. I added a link to this bsky account from my GitHub for verification github.com/schneems