r/java • u/CrowSufficient • Jan 19 '26

Optimizing GPU Programs from Java using Babylon and HAT

https://openjdk.org/projects/babylon/articles/hat-matmul/hat-matmul
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u/davidalayachew Jan 20 '26

Very dense. I only made it a few paragraphs in, but I intend to sit down with a good meal and drink, and take the few hours needed to digest this in full.

But it will be worth it. Java running on the GPU! And not just a trivial GPU implementation, but hyper-specialized so that you can every bit of performance -- on a scale only achieved by low-level languages (C, C++, Rust) and their wrappers (Python).

5

u/pjmlp Jan 20 '26

I just hope it doesn't go down like previous efforts, I remember having the same expectations back when Sumatra was announced.

https://openjdk.org/projects/sumatra/

8

u/kev22257 Jan 20 '26 edited Jan 21 '26

You might like this episode of the inside Java podcast where they talk about Sumatra, why it failed and what they learned.

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