John Dengis

Software auteur, code luthier, musician and retro gaming enthusiast. I also make videos in my spare time. Building @useunderflow.

[John Dengis @jadengis]

This is officially an Elixir / Erlang stan account now.

[John Dengis @jadengis]

@thecyrusjanssen Bro 20 yuan is a lot of money for food in China. Most people are not earning US equivalent salaries. A favourable exchange rate does not mean it is cheap or affordable.

[John Dengis @jadengis]

@gamer_lafan It was the gaijins coming to the popular retro store that made them expensive. Outside of touristy areas, the prices are still reasonable. Super Potato is super overpriced though. Best to just skip it.

[José Valim @josevalim]

Elixir v1.20 released! Now officially a gradually typed language: Elixir type checks every single line of code, finding bugs and dead code, without developer overhead (no typing signatures) and extremely low false positives rate. Plus a faster compiler! Links and reports below.

[John Dengis @jadengis]

@FfMeryll Boktai to me stands out as a game specifically designed for handhelds. You need to be able to bring the console into the sun to play. What a creative idea? I can believe it actually got made.

[𝙼𝙴𝙼𝙴𝙽𝚃𝙾 𝙼𝙾𝚁𝙸 𝚇𝙾💀 @MementoMoriXO]

The Weeknd posts videos of himself playing NieR: Automata via his alt account, gene.hackerman IG

A thread 🧵 of photographs and videos

[John Dengis @jadengis]

Why is The Weeknd hitting up all the greatest game creators in Japan? What is he cooking up???

[The Weeknd @theweeknd]

grasshoppers & shrines with my good friend
SUDA51

[John Dengis @jadengis]

Isn't it insane that the US healthcare system's default security question is the patient's... date of birth?

[John Dengis @jadengis]

@abierkhatib Bro looks like Danny DeVito as The Penguin.

[Mitchell Hashimoto @mitchellh]

I've got an agent in a loop optimizing a renderer with the goal to minimize frame times (and tests to measure). It got times down from 88ms to 2ms and allocations down from ~150K to 500. Sounds good, right? Wrong. This is exactly why agent psychosis is a big fucking problem.

As an experiment, I rewrote the Ghostty core render state in Go, with access to identically laid out data structures as Ghostty and the exact same validation tests. I made a purposely naive renderer (simple, correct, but slow). 88ms per frame with 150,000 allocations (horrendous, lol)!

I then kickstarted a Ralph loop to bring the frame times down. I told it it can't modify input data structures or the public API or tests (they're correct), but it can do anything else it wants. It got to work.

It has worked for about 4 hours. I've spent around $350 on this experiment so far. The results?

88ms => 1.5ms
150K allocs => ~500 allocs

Incredible right? Nope.

My hand-written renderer I ported has frame times (same benchmark) of ~20us (0.020ms) and 0 allocations in the update path.

This is the problem with psychosis and lacking systems understanding. If you don't understand the system, you're going to accept that this is an incredible result. If you understand the system, you'll see better solutions immediately and can do roughly 75x better on throughput.

The people who blindly trust agent output are in the former camp. They're sheeple, overdrinking from a fountain of mediocrity.

Standard disclaimer: I use AI all the time. I like AI. The point I'm making is to not blindly accept results. Think. Analyze. Learn.

[John Dengis @jadengis]

@SchulMozart more correct romaji for Tokyo would be Toukyou, because both the to and kyo are long vowels. The to in Kyoto, is not long.

[John Dengis @jadengis]

This sounds exactly the same as the 4.7 announcement... Have models become iPhones?

[Claude @claudeai]

Introducing Claude Opus 4.8: it builds on Opus 4.7 with sharper judgment, more honesty about its own progress, and the ability to work independently for longer than its predecessors.

Available today at the same price.

[John Dengis @jadengis]

@tokifyi I bet a lot of those US views are Canadians in the US.

[John Dengis @jadengis]

@NotMeis95 @aisingioron This is literally the plot of a Chinese movie called tiny times 3.

[John Dengis @jadengis]

@MindTheGapMTG @LayoffAI Dehumanizing people is a great way to get them to work hard for you. 🙄

[古代祐三 Yuzo Koshiro @yuzokoshiro]

@AlertaNews24 @zonbonbun Felicidades

[John Dengis @jadengis]

@AdamRackis There is more money in it being illegal than legal.

[John Dengis @jadengis]

What are they cooking up?

[The Weeknd @theweeknd]

dinner with a couple friends
Yoko Taro
&
Hidetaka Miyazaki

[John Dengis @jadengis]

@AdamRackis Definitely. I love not having to solve esoteric config bullshit by myself any more.

[John Dengis @jadengis]

@SlumRNA_Dog Everybody makes low wages even on corporate jobs.

[William Shatner @WilliamShatner]

I know nothing about it. 🤷🏼 I do hope it’s a real @wizards_magic deck. 🤨Though they should redo the card as he looks like he didn’t have his @KelloggsUS #RaisinBran that morning and will have some trouble boldly “going”! 🚽😉🤣