raphlinus

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91.
by raphlinus 1y ago
You're probably right about this. In the short to medium term, I expect that the Rust and C++ sub-ecosystems will be making different sets of choices. I don't know of any major C++ game or game-adjacent project adopting, say, Dawn
92.
by raphlinus 1y ago
This is a longer and deeper conversation, but I think on topic for the original article, so I'll go into it a bit. The tl;dr is developer friction. By all means if you're doing a game (or another app with similar build requirement
93.
by raphlinus 1y ago
Yup, I think slang is the future. Anyone on this thread willing to fund a Rust implementation?
94.
by raphlinus 1y ago
We tried something like this with piet-gpu-hal. One problem is that spirv-cross is lossy, though gaps in target language support are getting better. For example, a device scoped barrier is just dropped on the floor before Metal 3.2. Atomics
95.
by raphlinus 1y ago
So I would say skill at GPU assembly is in-demand for the elite tier of GPU performance work. Not necessarily writing much of it (though see [1] for an example, this is the kernel of multisplit as used in Nvidia's Onesweep implementati
96.
by raphlinus 1y ago
The question of which assembly is best to learn is of course incredibly subjective, but I think the author gives short shrift to ARM32. It is historically important (especially for the Acorn computers, most popular in the UK), sensibly desi
97.
by raphlinus 1y ago
I read LLVM (or one of its many GPU-flavored variants) reasonably often, mostly to figure out where in the chain a shader miscompilation is happening. But I've never personally had to write it, and it's not easy for me to think of
98.
by raphlinus 1y ago
Thanks so much, Peter, for writing this up. I think it adds a lot to the record about what exactly happened with the Cell. And, as with Larrabee, I have to wonder, what would an alternative universe look like if Sony had executed well? Or i
99.
by raphlinus 2y ago
Thanks for posting this, I'll take a look. It wasn't on my radar, but the idea of doing a DSL specifically for SIMD is something I've been thinking about and also starting to explore myself.
100.
Towards fearless SIMD, 7 years later(linebender.org)
177 points by raphlinus 2y ago|175 comments
101.
by raphlinus 2y ago
There are a lot of odd exclusions on that list. Just spot-checking, I see blog.plover.com, the blog of Mark Jason Dominus, who by the way is looking for a job[1]. Also, dtrace.org is excluded, which hosts four individual blogs that surely s
102.
by raphlinus 2y ago
Yup. A little more detail on the overheating part in particular is here: https://github.com/AsahiLinux/speakersafetyd
103.
by raphlinus 2y ago
Getting reasonable speaker support in Asahi Linux was a big deal. Part of the problem is that limiting the power usage to prevent overheating requires sophisticated DSP. Without that, you get very limited volume output within safe limits. P
104.
by raphlinus 2y ago
Regarding the SIMD optimizations, the authors may want to look into faer. I haven't had a great experience with its underlying library pulp, as I'm trying to things that go beyond its linear algebra roots, but if the goal is prima
105.
by raphlinus 2y ago
Absolutely. And the fact that we need to evolve both is one of the reasons progress has been difficult.
106.
by raphlinus 2y ago
I consider Xeon Phi to be the shipping version of Larrabee. I've updated the post to mention it.
107.
by raphlinus 2y ago
> It is an instance of Larrabee in the same sense as AMD Zen 4 is an instance of Larrabee. This is an odd claim. Clearly Xeon Phi is the shipping version of Larrabee, while Zen 4 is a completely different chip design that happens to run
108.
by raphlinus 2y ago
The problems I'm having are very different than those for raytracing. Sure, it's dynamic, but at a fine granularity, so the problems you run into are divergence, and often also wanting function pointers, which don't work well
109.
by raphlinus 2y ago
Possibly compilation and linking. That's very slow for big programs like Chromium. There's really interesting work on GPU compilers (co-dfns and Voetter's work). Optimization problems like scheduling and circuit routing. Sear
110.
I want a good parallel computer(raphlinus.github.io)
233 points by raphlinus 2y ago|194 comments
111.
by raphlinus 2y ago
The argument I have in mind is subtle and nuanced, and I didn't write clearly in that comment (the bit about the smart solo programmer was mostly sarcasm but with a grain of truth). But to try to answer: The value of UB is to clearly
112.
by raphlinus 2y ago
Oh hey, I also have "in defense of undefined behavior" in the queue of blog posts I'd like to write some time, with that exact title. What a coincidence. That said, it's unlikely to get written as I have things that are
113.
by raphlinus 2y ago
Well, I have some qualifications in typography, a reasonable familiarity with ML techniques, and am fairly good at math (though I can't claim to have won the Putnam), and I can imagine how to apply ML for this task.
114.
by raphlinus 2y ago
Agree with sibling comments. There's something very slippery and tricky going on with "perceptual area," it's not simple geometry. This is actually an area where I think machine learning has something to offer.
115.
by raphlinus 2y ago
Yup, nothing wrong with clear exposition about simpler algorithms, there's definitely a place for that. I just thought HN readers should have some more context on whether we were looking at a programming exercise or state of the art al
116.
by raphlinus 2y ago
The second one is Thomas Smith's independent reimplementation of Onesweep. For the official version, see https://github.com/NVIDIA/cccl . The Onesweep implementation is in cub/cub/agent/agent_radix_
117.
by raphlinus 2y ago
This is not a fast way to sort on GPU. The fastest known sorting algorithm on CUDA is Onesweep, which uses a lot of sophisticated techniques to take advantage of GPU-style parallelism and work around its limitations. Linebender is working (
118.
by raphlinus 2y ago
You might enjoy this talk by Erik Lindholm (now retired), who talks about Riva 128 and many of the other early Nvidia cards: https://ubc.ca.panopto.com/Panopto/Pages/Viewer.aspx?id=880a...
119.
Closing the “green gap”: energy savings from the math of the landscape function(terrytao.wordpress.com)
111 points by raphlinus 2y ago|71 comments
120.
by raphlinus 2y ago
I just want to say I'm rooting for you, and hope you enjoy the book and learn a lot from it. I had a bad experience with complex analysis as a teen (took a grad class that was a bit over my head). Many years later, I got Tristan Needha

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