Jon Gjengset

Sadly, I can't make it to the inaugural TokioConf happening in Portland April 20th - 22nd; I'll be en route to the Blood on the Clocktower convention Final3Con in DC instead 😈

But, I do have a 15% discount code I've been told to hand out to people excited to go, so if you've been considering taking part, ping me and I'll see what I can do!

More about the conf and who it's for (tl;dr: lots of people!) here: https://tokio.rs/blog/2026-03-03-tokioconf-update

#rust

In January, Anish, Jose, and I returned to MIT CSAIL to teach Missing Semester, a class on topics we've found missing from most CS programs—tools and techniques that everyone should know, like Bash, Git, CI/CD, and AI tools. Today, just like in previous years, we’re releasing the course for free online!

https://missing.csail.mit.edu

@stchris@mas.to To be fair, it _did_ get a lot easier when I could just download the .jar from the releases page/from Maven with the right command, as I realized later on. But yeah, still not super easy to discover (although admittedly I'm _very_ rusty on my Java).

Recording of our "port avro-tools' Java-based idl-to-json tool to Rust using an LLM" adventure is now up on YouTube! We got to an initial working implementation in ~4hrs (though still with bugs to iron out in future iterations), which isn't too shabby! Code at https://github.com/jonhoo/avdl.

https://youtu.be/vmKvw73V394

@ryanvade@mas.to Why?

Friday 9a UTC (https://everytimezone.com/s/5903cd46) sounds like a good time for a stream! This time, we'll try to port Avro's IDL-to-JSON tool from Java to Rust (with LLM help), leveraging the fact that their grammar is written using ANTLR to make our job easier.

If you don't know Avro, it's Apache's equivalent to Google's Protocol Buffers. See https://avro.apache.org/docs/1.12.0/idl-language/.

Come join me 🎉
https://youtube.com/live/NqV_KhDsMIs?feature=share

The recording of the new year's Q&A stream is now up, with all the questions annotated for easy skipping! https://youtu.be/S_zp82fYrGw

RE: @jonhoo@fosstodon.org

Quick reminder that this is coming up. Lots of good questions have come in, so please take some time to go in and vote for the ones you care the most about!

We're nearing the new year, and that means it's time for another January 1st Q&A stream! Please go ask and vote for questions ahead of time at https://wewerewondering.com/event/01KDDAR568ZMCG9HT70BDHF150 — no question is too small or too big. As always, I'll try to get through as many as I can during the stream, and the recording will be uploaded after the fact. Stream will start 2026-01-01 at 2:30pm UTC over at https://youtube.com/live/g1ZgInFTfEo?feature=share. Hope to see a bunch of you there ❤️

Okay, this is pretty cool.

Video of the One Billion Row Challenge stream is now up at https://youtu.be/tCY7p6dVAGE! We got down to 1.2s without any external dependencies, and it was a fun journey down lots of performance rabbit holes (only some of which panned out 😅). It is over 10h, but hopefully the chapters in the video help!

I'm late to the party, but the One Billion Row Challenge (https://github.com/gunnarmorling/1brc) feels like an excellent way to dig into optimizing Rust code and learning somethings about assembly, SIMD, performance profiling, and just CPUs in general in the process, so let's take it on!

Come join me on Saturday at 11am UTC (https://everytimezone.com/s/70bf2c9d) over on https://youtube.com/live/g2EKNXKKGM4?feature=share, and we'll see what we can squeeze out of it 🏎️ This will likely be a long one 😅