FlashAttention-2 in Cute, from Scratch
A line-by-line dredge-through of Tri Dao
FlashAttention-2 in Cute, from Scratch launched on May 18, 2026 with 6 votes, #1,742 of 20,538 launches that month and more than 75% of that year's launches.
What it does
Two days. That’s how long it took me to write FlashAttention-2 in Triton. I had never touched a GPU kernel before and somehow replicated a revolutionary algorithm between sips of coffee. I was looking to learn something new and somehow finished before I really got started. I knew the original source was written in CUDA, made by my Bay Area buddy who turned rocks into trillion-ade. Riding on my hubris from my recent success, I decided to translate my pièce de résistance to the native dialect of the rock-whisperers themselves. Three hundred cups of not-Java later, I raised the blood-soaked script in triumph. I spent many moons deciphering the barren scriptures and getting led by astray…from blog.echen.io
Does a similar job
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Source: Show HN post ↗
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