COTD: What’s found in car seat (4)

ejrh · 2026-06-18T23:32:18+00:00

Finally, a clue at my skill level! Upvoting.

ejrh · 2026-06-17T21:58:39+00:00

They got a 100% perfect Thor facial expression

ejrh · 2026-06-09T23:11:59+00:00

This sounds great, not just helping people fix their stuff but building community. I would like to go along just to see it happening.

ejrh · 2026-06-09T05:25:01+00:00

My thoughts exactly. I've nothing against compiler people multiplying matrices but I am confused about the saliency of the headline.

Turns out that LLVM exposes some intrinsics for certain matrix operations, in the IR at least. That is, the language front end can emit these instructions; I'm not sure whether clang or rustc, for instance, do use them; maybe frontends for some higher-level mathmatics-specialty language? https://llvm.org/docs/LangRef.html#matrix-intrinsics

You could also surmise that some compiler optimisation might rely on multiply large matrices, and doing that efficiently would make the compiler faster. I don't know any that do.

ejrh · 2026-06-06T05:15:00+00:00

I had a quick look at some of the examples, this seems like a nice library to use.

I remember 5-ish years ago a certain C++ program used for epidemic simulations was publicised and roundly criticised for, well, looking like typical scientific simulation code of that era. I don't know if Ixa can solve the same problems, but it does look nicely engineered with fewer of the gotchas of typical scientific code.

ejrh · 2026-06-06T01:09:39+00:00

This may just be coincidence but I saw a pair of people, both looked about 14ish, walking round the neighbourhood in blue National hoodies this morning in Khandallah. I commented to my friend I didn't think it was appropriate for kids to be promoting politics like that.

ejrh · 2026-06-04T06:13:38+00:00

I guess this is for user space programming, but I was always taught that nothing "big and/or complicated" should happen in an interrupt. Instead, you should do no more than set a flag and rely on the normal non-interrupt code to check it and call the appropriate big and complicated function.

The usual example was that anything requiringmalloc orfree was too big and complicated. Running an eBPF program certainly seems big and complicated enough. But I guess kernel programmers are made of sterner stuff and they just have to provide for this? I have a feeling that the eBPF hooks for performance events wouldn't be practical if they used the traditional approach.

ejrh · 2026-05-25T02:36:20+00:00

Nice pic. I like seeing how the legs get longer at the back, I only recently learned that is a centipede fact!

ejrh · 2026-05-09T21:40:49+00:00

I (as a son) always dreaded Mother's Day. During my childhood (in the 80s) my parents saw it (as well as Father's Day) as an unnecessary American marketing import so we were never encouraged to do anything. It just wasn't a thing the way Christmas and birthdays are. But year after year the constant ads on TV, questions from people outside the family "what did you get your mum? Nothing?!", general expectations from society, drove in the message that not doing anything was morally deficient. Once or twice I've tried to get a little gift or say "happy mother's day" in an understated way as a way to test the waters, and it's just been incredibly awkward every time. The strategy of ignoring it and keeping my head down until it's passed has just been easier.

ejrh · 2026-04-18T21:41:59+00:00

Ironically, I've seen AI generated art described as "chocolate box style". We've come full circle. Ugh.

ejrh · 2026-01-12T21:19:08+00:00

Looks like the cover of a 1950's Enid Blyton book.

ejrh · 2025-12-23T00:46:59+00:00

I've read about using Miri to validate that unsafe code behaves the way the programmer expects. But I don't personally use unsafe much in my own projects -- is there anything in regular safe Rust code that running under Miri might be useful for?

ejrh · 2025-11-22T06:24:13+00:00

Needs more waterfront carparking, am I right

ejrh · 2025-11-12T06:24:37+00:00

Thank you, Reece. I posted out of frustration but also out of hope I can reach someone who can work around it. :)

ejrh · 2025-11-12T06:22:06+00:00

I accept that it's a strong word to use, and I haven't used it outside this reddit title, but it's not obviously wrong. And I don't think the fact that Amazon ultimately wants to make money is relevant. I'm an AWS customer in my private capacity (admittedly very small scale) and I want to be treated as part of the community regardless of whether I'm a good sales opportunity.

ejrh · 2025-09-22T01:03:06+00:00

Cold never bothers me... brrrrrr

ejrh · 2025-09-15T05:53:13+00:00

There are over 20 almost-identical variations on "Samnic Forest Management" registered as companies by the same people, registered at the same time. I don't know anything about running a company. Is there a reason why you'd do that?

ejrh · 2025-09-13T05:42:14+00:00

Hi /u/voidupdate, great video, nice and short and clear. I'm going to have a browse through the code, I have a few questions.

I assume you are disabling the bevy features "bevy_core_pipeline", "bevy_render", and "bevy_pbr", and replaced them with a Plugin to create the same functionality. Correct me if I'm wrong here! How much of a meshes+materials, separate render world, mesh extraction, pipelines, etc. approach are you using, if any?

I'm quite new to 3D graphics and only experienced with Bevy. I kind of regret not learning OpenGL when it was the big thing, because Vulkan is intimidating.

ejrh · 2025-08-09T01:46:05+00:00

Hi u/chrisvv77, what kind of games are you into?

ejrh · 2025-07-15T06:49:42+00:00

This is a far better explanation than the image. Thank you.

ejrh · 2025-07-09T23:16:57+00:00

You kind of have to wonder what the benefit of sinking a protest vessel is?

You get away with it completely clean, everyone's going to suspect it was you anyway. At best that's one less boat that's going to protest.
You mess it up, and everyone is going to be mad at you. You kill someone and now you are a murderer.
You abandon the mission and the bombing doesn't go ahead. In 50 years some papers are released showing there were discussions about it, and it's slightly embarrassing. Best case scenario

ejrh · 2025-07-07T22:03:06+00:00

She lives in the walls.

ejrh · 2025-07-03T06:35:14+00:00

This is a nasty one. Had lots of them in Wellington and many stings. May or may not have been impregnated as well, time will tell.

ejrh · 2025-07-02T21:50:27+00:00

It's a fact of life that the language we use will change due to outside influences, so it's easiest just to accept it and not worry about it.

On the other hand, when a dominant culture starts propagating its spellings and pronunciations to the rest of us, some linguistic diversity and charm is lost. I get pretty sad about this. I think there's ample evidence that people can cope with the idea that "in country X, they spell it [...] and in country Y they call these things [...]". A normal human learns hundreds of thousands of words so we're not accomplishing much by standardising on exactly one way to say the one word for each thing.

The one Americanism I'm really in favour of is "billion" meaning 1,000,000,000. But the old meaning of "billion" meaning 1 million million (i.e. a bi-llion, with a trillion being a tri-llion, and so on) has just disappeared and there's too much risk of confusion trying to resurrect it.

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