Jonan Scheffler

Developer Advocate at Heroku Heroku Alumni

Jonan is a developer at Heroku and an aspiring astronaut. He believes in you and your potential and wants to help you build beautiful things. He loves robots, games, LEGOs and Magic: The Gathering. If you like any of those things or are willing to pretend you should go and introduce yourself. Other good conversation starters: anything you’re passionate about, your life story, what you want to be when you grow up and how you became so fabulous.

Optimizing Database Performance in Rails

engineering Last Updated: April 15, 2019 Jonan Scheffler, Developer Advocate

Setting up a database is a relatively straightforward process (Heroku has an add-on for that), but getting it to run well in production is sometimes another matter. As your application grows and your data grows along with it, you will likely find a number of performance bottlenecks specifically related to your database, and this post aims to help you diagnose and address those issues when they arise.

As with all components of your infrastructure it’s important to have early visibility into the performance characteristics of your database. Watching this data as your application grows will give you a much better chance of spotting performance issues and regressions as they’re introduced.

I...

Ruby 2.6 Released: Just-In-Time Compilation Is Here

engineering Last Updated: March 29, 2024 Jonan Scheffler, Developer Advocate

ruby-2

The Ruby committers have again continued their annual holiday tradition of gifting us a new Ruby version: Ruby 2.6 was released today, including the long awaited Just-In-Time (JIT) compiler that the Ruby team has been working on for more than a year.

Just-In-Time compilation requires Ruby to spin up a compiler process on startup, and we're proud to say that this feature is supported today on Heroku thanks to the diligent efforts of our very own Richard Schneeman. We'd also like to thank fellow Herokai Nobuyoshi Nakada for his effort making sure the new JIT works well with all of the officially supported compilers: GCC, Clang and Microsoft Visual C++.

Using Ruby 2.6 on Heroku

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MJIT: A Method Based Just-in-time Compiler for Ruby

engineering Last Updated: March 29, 2024 Jonan Scheffler, Developer Advocate

I sat down with some Ruby friends in Hiroshima last year to have a conversation about just-in-time compilation for Ruby, specifically the new MJIT method-based implementation. Those of you who are already familiar with JITs and how they work might want to skip directly to the interview, the rest of us are going to hang out for a minute and learn about how things presently work in Ruby, and what it is exactly that the MJIT would change.

How does a Ruby program run?

Computers don’t speak Ruby or any other high-level language, they only speak machine language. In a compiled language like C++ you use a compiler to convert all of your C++ code into machine language directly before you run...

Best of the Blogs: A Heroku Community Tour

news Last Updated: July 12, 2024 Jonan Scheffler, Developer Advocate

Heroku is very fortunate to have a strong community of developers that are excited and passionate about our product. Every day we hear from customers who tell us how much easier Heroku has made their lives, and they frequently share stories about interesting technical projects we've helped them bring to life.

Our customers love us, and we love them right back. Today we'll take a look at a few blog posts and applications from Heroku users that illustrate what makes our community so special. We hope you enjoy the tour. If you have Heroku stories of your own you'd like to share, we'd love to hear them!

Dynos Spinning Other Dynos with Heroku

This article comes to us from ...

The Future of Ember.js: An Interview With Tom Dale at EmberConf - Part Two

news Last Updated: September 17, 2020 Jonan Scheffler, Developer Advocate

This is the second of a two-part transcript from a recent interview with Tom Dale of Ember.js. In part one we discussed the history and direction of the Ember.js project. Continuing the discussion of the future for Ember.js, this post includes the rest of the interview, primarily focused on the Glimmer.js project. Some of the questions were omitted from these transcriptions for brevity, so we’re also releasing the nearly hour long audio file of the entire interview. Enjoy!

Jonan: Let’s talk about Glimmer 2. If I understand correctly it's released now and it entirely supplants Ember. So how are you planning to gracefully sunset the project?

Terence: I think locks (Ricardo Mendes)...

The History of Ember.js: An Interview With Tom Dale at EmberConf - Part One

news Last Updated: May 09, 2017 Jonan Scheffler, Developer Advocate

At EmberConf Terence Lee and I had a chance to sit down with Tom Dale and chat about the history of Ember.js and where it’s headed now, including some details on the newly extracted Glimmer.js rendering engine. This post details a lot of the history of Ember, including some of the motivation that led the framework to what it is today. Watch the blog for the second portion of this interview with all of the details on Glimmer.js. The next post will also include the full audio of the interview, with many questions we opted to omit from the transcription to save valuable bytes.

Jonan: So, we're at EmberConf speaking with Tom Dale, who gave a keynote today with some important...

Ruby 2.4 Released: Faster Hashes, Unified Integers and Better Rounding

news Last Updated: March 29, 2024 Jonan Scheffler, Developer Advocate

The Ruby maintainers continued their annual tradition by gifting us a new Ruby version to celebrate the holiday: Ruby 2.4 is now available and you can try it out on Heroku.

Ruby 2.4 brings some impressive new features and performance improvements to the table, here are a few of the big ones:

Ruby 3x3: Matz, Koichi, and Tenderlove on the future of Ruby Performance

news Last Updated: June 03, 2024 Jonan Scheffler, Developer Advocate

At RubyKaigi I caught up with Matz, Koichi, and Aaron Patterson aka Tenderlove to talk about Ruby 3x3 and our path so far to reach that goal. We discussed Koichi’s guild proposal, just-in-time compilation and the future of Ruby performance.

Jonan: Welcome everyone. Today we are doing an interview to talk about new features coming in Ruby 3. I am here with my coworkers from Heroku, Sasada Koichi and Yukihiro Matsumoto, along with Aaron Patterson from GitHub.

Jonan: So, last year at RubyKaigi you announced an initiative to speed up Ruby by three times by the release of version three. Tell us more about Ruby 3x3.

Matz: In the design of the Ruby language we have been primarily focused on...

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