yosh

Be kind to people, be ruthless to systems.

Concurrent Computing ←
Programming Language Design ←
WebAssembly and Rust at Microsoft ←

u(๑╹ᆺ╹)

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nprofile1qqswrayd9urhkr2396rxd0m6phwaa5hyg0vekryjem84w76w2zux2ccpz3mhxue69uhhyetvv9ujuerpd46hxtnfduqs6amnwvaz7tmwdaejumr0dspw2x52

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Last Notes

2026-04-29 11:33:59 UTC

In case people are wondering why GitHub has been having some issues as of late - the GitHub COO recently shared that they're handling up to an order of magnitude more traffic than they were a year ago.
It's not like GitHub is just serving up pictures and text - things like the core git backend and actions are quite complex to host at scale. Idk, I guess I'm not surprised there are some stability issues when they're going from handling 1 billion commits/year to 14 billion commits/year.
https://cdn.masto.host/tootyoshis/media_attachments/files/116/487/778/101/627/582/original/12f22c6eba6a04e6.png

2026-03-20 12:21:55 UTC

I just went in for my third dose against Tick-Based Encephalitis, and the lovely person administering the shot told me that they are expecting to be able to provide immunization against Lyme disease either in 2027 or 2028!
Apparently Pfizer has a vaccine currently being trialed in phase 3. And they expect it will go well, which means a vaccine might actually become available soon!

2026-03-03 00:42:49 UTC

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@nprofile…w9rm that's slime slander!

2025-11-30 02:05:36 UTC

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Slack, overhead, and spare capacity are not inefficiencies to be ground down, but integral to the stable functioning of systems. Because a system without buffers cannot absorb shocks.

2025-08-25 21:09:53 UTC

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@nprofile…50zr ahahaha, yeah that's understandable

2025-08-25 20:56:24 UTC

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@nprofile…50zr Ohhh, that sky cove looks really cozy!

2025-08-24 19:39:59 UTC

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Oh the other hand: having plugin management built directly into nvim is awfully convenient.
I want to see if I can restore the base key bindings, and then maybe also remove the popup screen. Can't say I love how barebones base neovim is either lol.

2025-08-24 19:27:30 UTC

On the topic of Vim: I'm back behind my computer again today after having touched grass for a week. And yeah no, I don't think I actually like Lazyvim that much?
I feel like it messes with too many of the default settings; in particular overriding the `g-n` bindings to mean something else.
Lazyvim very much feels like a neovim-based editor, rather than a "configured neovim” instance. Kickstart vim seems much better for what I want imo!
https://github.com/Simpaqt/kickstart-vim

2025-08-23 17:27:27 UTC

Listen, there is no such thing as a bad cooking method. Different method for different outcomes.
But I will say this: I think barbecuing is overrated.
The upper end of it can be incredible. But the median experience just like,, isn't? Like, give me an oven and a blowtorch and I can create food that is juicier and has a better char than the average barbecue.

2025-08-23 08:48:51 UTC

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Another good night sleep; this time around: 10.5hrs!
https://cdn.masto.host/tootyoshis/media_attachments/files/115/077/213/509/548/758/original/4f46724f3739dd0b.jpeg

2025-08-20 03:28:12 UTC

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Going to have such good refried beans tomorrow tho.

2025-08-20 03:27:41 UTC

Had trouble* falling asleep, decided to prep tomorrow's dinner today.
* fell asleep for 3hrs, woke up - couldn't fall asleep again. Not too bad overall tbh.

2025-08-18 10:22:04 UTC

Slept 9+ hrs! For what feels like the first time in a year!
https://cdn.masto.host/tootyoshis/media_attachments/files/115/049/268/431/712/374/original/061c102c5417ad2a.jpeg

2025-08-16 11:56:37 UTC

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Looking at the tags here, the current nightly is tagged v12.0: https://github.com/neovim/neovim/tags
I'm not familiar enough with neovim's release schedule to say anything particularly informed; but just looking at their historic release schedule it seems that neovim 12 might be somewhere between 2-6 weeks away?

2025-08-16 11:43:59 UTC

Oh wow, starting from version 11, Neovim will not only begin shipping with a native package manager (!), it will also begin shipping with native LSP support (!!!).
https://youtu.be/xGkL2N8w0H4

2025-08-15 10:34:22 UTC

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@nprofile…46gt how do you do that? I couldn't find a setting for it, and I saw a bunch of open issues asking for it.

2025-08-15 09:36:48 UTC

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@nprofile…46gt hah, not sure if this is a setup for a joke?
"Whose there?" I guess lol

2025-08-15 03:03:54 UTC

Nope, I give up. Helix just isn't there yet for me. It:
- doesn't have working reflow key bindings, which they inherited from Kakoune
- doesn't have support for tabs (a 400 LOC PR has been open for years)
- doesn't have a plugin system (and they're going to design a new language for it, it sounds like?)
- doesn't render diagnostics in a way that I enjoy reading
- doesn't have support for mini map/scroll bars
I think helix is a cool project. But I really can't see myself daily driving it as-is

2025-08-14 23:36:50 UTC

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Found out the other day that the IETF uses Zulip too. So does the Rust project. So does the Bytecode Alliance.
Do I have issues with Zulip? Yes, plenty. Does Zulip send me notifications to buy "orbs"? No, never. And I'm glad.

2025-08-14 23:34:15 UTC

Say what you will about Zulip; at least they're building a piece of software that works and seems to be gradually improving over time.
As a company they don't seem particularly interested in engaging in the hyper-growth-or-die cycle that so many other companies fall into. And like, for something I treat as infrastructure, I think that's great.

2025-08-13 13:39:33 UTC

New blog post: Placing Arguments
https://blog.yoshuawuyts.com/placing-functions/
Placing arguments sound like a promising idea, but it turns out they’re fundamentlly different from regular arguments in subtle ways. Enough so that I don’t believe we can introduce them in a way that would be practical. So then the question becomes: what can we do instead?

2025-08-12 11:09:51 UTC

Ok so, hear me out…
https://cdn.masto.host/tootyoshis/media_attachments/files/115/015/481/815/961/316/original/21b35d23cc4f5cb7.jpeg
https://cdn.masto.host/tootyoshis/media_attachments/files/115/015/482/162/063/666/original/c0ae1f17c87cca55.jpeg
https://cdn.masto.host/tootyoshis/media_attachments/files/115/015/482/465/758/033/original/75f41d9e5672c5a0.jpeg

2025-08-11 20:42:57 UTC

Zellij's support for stacked windows is so nice! I now have a setup where my main pane has my editor, but my right pane has a stack of three different programs I can rotate through:
- a regular terminal session
- a tui-based git client (lazygit)
- a tui-based file explorer (yuzi)
In the future I plan to configure this further by creating additional, project-specific panes too. For example: dedicated `cargo test`, `cargo check`, and `cargo run` panes.
https://cdn.masto.host/tootyoshis/media_attachments/files/115/012/073/027/370/819/original/d2ecac755347aae3.png
https://cdn.masto.host/tootyoshis/media_attachments/files/115/012/073/383/310/575/original/39e4c5288ba9081c.png
https://cdn.masto.host/tootyoshis/media_attachments/files/115/012/073/754/662/556/original/d841e67d9e69f4a8.png

2025-08-11 10:44:29 UTC

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@nprofile…nj2f @nprofile…e7zl
I didn't know slice-stable sort allocated under the hood 👀
Imo that might change things?

2025-08-11 09:19:01 UTC

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@nprofile…e7zl
Wish we would have gotten more of those unnecessary allocations tbh 🫠
https://blog.yoshuawuyts.com/the-waker-allocation-problem/

2025-08-10 15:16:09 UTC

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LoRa/LoRaWAN, at least on paper, should have a range of up to 1.5KM, with good battery life, and no subscriptions required. It's designed for lightweight trackers. I'm just really confused this hasn't yet been commercialized for pet trackers?

2025-08-10 15:14:08 UTC

I'm looking at the state of cat trackers, and I can't believe there aren't any commercially-available LoRa/LoRaWAN-based trackers available.
The first category of devices are airtag-like trackers (2.4gHz), which have good battery life, are light-weight, have no subscription required, but with only a range of around 15-30M.
The second category are GPS/Cellular-based trackers, which have an unlimited range, but are bulky, have bad battery life, and require (expensive!) subscriptions.

2025-08-09 17:52:42 UTC

I'm rapidly approaching the “re-flash my keyboard" stage of setting up my terminal.

2025-08-07 02:29:11 UTC

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Related: I'm also quite keen to try out jujutsu for real sometime soon. Enough computer folks I respect swear by it, and I think it's time I try it myself ^_^

2025-08-07 02:28:00 UTC

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The reason? Well, I could come up with some big talk about productivity or whatever, but to be fair I just really like messing around with computer tools. It's important to do things that spark joy y'know?
But there's also something really appealing to having a setup that's all-rust imo!

2025-08-07 02:22:48 UTC

I spent a bit of time after work messing around with zellij again. I'm still somewhat tempted to make the switch from VS Code back to the terminal. But this time instead of neovim + tmux, instead using helix + zellij.

2025-08-06 16:04:12 UTC

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For me the most interesting part of this project is the plugin system itself tbh. I think what we've done for Wassette should not be that hard to reproduce for other systems and protocols that want to have an extension system.

2025-08-06 15:55:09 UTC

Introducing Wassette - a Wasm runtime that exposes Wasm Components over the MCP protocol:
https://opensource.microsoft.com/blog/2025/08/06/introducing-wassette-webassembly-based-tools-for-ai-agents
The entire industry seems to be driving to create MCP-based tooling for their products. But what if, 1) those tools didn’t just have to be specific to MCP, and 2) we could actually employ good security practices like sandboxed execution of untrusted code, deny-by-default access to system resources, and so on. All stuff that imo you’d hope to see in a plugin system.

2025-07-27 22:25:19 UTC

I'm learning about the US-EU trade deal and oh my god. Asymmetric 15% tariffs in favor of the US. And why? So the EU can get Ford F-150 trucks killing children here too? So we can buy US arms? Make it make sense.
I hate neolibs so much oh my god.

2025-07-01 23:57:52 UTC

too eepy to wake
too wakey to eep

2025-06-28 14:52:39 UTC

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Cozymaxxing in ways most people can't even conceive of.
(Half joking, but also somewhat earnest. Ceiling-mounted acoustic insulation for residential applications is severely underrated imo.)

2025-06-28 14:50:11 UTC

One day I'll own a house and I'll be able to engage in acoustic design for it.
I strive to be the type of guy who will tell you about the acoustic properties of our living room.

2025-06-23 09:57:14 UTC

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@nprofile…6j29 yessssss!!!!!! Do you want my recipe for Ukrainian dill pickles?

2025-06-22 20:29:48 UTC

Started fermenting 3 liters of Đồ Chua today ^___^

2025-06-20 11:53:07 UTC

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I went on the computer for 30 mins today. And I biked to and from the grocery store for 20 mins total.
No crash so far! Not even anything remotely resembling exhaustion. Which means I'm in the clear to make my own lunch ^^

2025-06-20 07:55:37 UTC

Woke up, no symptoms anymore. Doesn't mean I'm in the clear yet - but it's a good sign!
Energy levels are still low. But not long-Covid low. I expect to be able to go back to work next week, at least in a part-time capacity. Which means: couple of hours a day of work, and minimal meetings.

2025-06-12 15:30:08 UTC

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Last time around I wasnt able to do more than shuttle between my bed and the couch for about six weeks. And it took me something like 6 months to start feeling like myself again.
Crossing my fingers things won't be anything like that this time around.

2025-06-12 15:27:18 UTC

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I've stopped getting worse. With some luck I might even start getting better soon.

2025-06-11 18:36:19 UTC

Have Covid again :(

2025-05-31 22:42:53 UTC

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For the record, I'm modifying an existing model. If I was anywhere good enough to make that base model I wouldn't be struggling the way I am lol.

2025-05-31 22:41:52 UTC

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I feel so clunky lol. Even basic stuff like: "remove this screwhole, replace it with something else." is like, so hard.
But I'm sure I'll figure it out eventually! And like, I'll build grit my teeth and build the keyboard case of my dreams.

2025-05-31 22:40:03 UTC

Nowhere near where I'd like it to be, but it's progress!
https://cdn.masto.host/tootyoshis/media_attachments/files/114/604/847/807/528/135/original/d72362ac6025e355.jpeg

2025-05-26 15:13:45 UTC

New blog post: Async Traits Can Be Directly Backed By Manual Future Impls
https://blog.yoshuawuyts.com/async-traits-can-be-directly-backed-by-manual-future-impls/
This is a pretty short one. It clarifies a common misconceptions people have about the performance of Async Functions in Traits (AFITs), showing how to back those using manually implemented future state machines. Which is important, because it means performance and convenience are not mutually exclusive.

2025-05-23 09:05:14 UTC

New post: The Waker Allocation Problem.
https://blog.yoshuawuyts.com/the-waker-allocation-problem/
This post describes the unfortunate tradeoff async concurrency primitives have to make by either allocating or having quadratic wakeup behavior.

2025-05-15 22:37:53 UTC

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@nprofile…4wg6 ohhhh, neatttt!

2025-05-15 22:03:33 UTC

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@nprofile…4wg6 I really want to try this out at some point. I've got a custom keyboard case to design, and this seems better than most other options ^^

2025-05-15 20:47:09 UTC

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otoh I did bike for 20km today. being tired is not surprising

2025-05-15 20:45:49 UTC

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borng 2 honk shoe
forced 2 write

2025-05-15 20:37:01 UTC

im too tired to thimk

2025-04-29 11:40:07 UTC

New blog post: Syntactic Musings on Match Expressions
https://blog.yoshuawuyts.com/syntactic-musings-on-match-expressions/
In this post I cover some of the oddities of Rust's match keyword, and discuss ways in which we might be able to make these both easier to learn and use.

2025-04-22 17:21:19 UTC

Successfully reduced 4L of chicken broth to around 500mL of stock. I was saying to my partner a few weeks ago how I didn't like how much space broth was taking up in the freezer. That should no longer be a problem!

2025-04-04 15:10:55 UTC

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@nprofile…q5gk This is so cool! - I’m really happy to see this!

2025-04-04 02:06:29 UTC

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(the longest unpublished blog post I have is approx. 20.000 words. that's the size of a short book. Or 40 of the blog posts I just wrote)

2025-04-04 02:03:53 UTC

pls clap. I (re-)wrote a blog post and it's only 500 words. Back down from the 1000+ half-done draft I had staring me down for over a month now.
Will publish tomorrow!

2025-04-03 21:07:52 UTC

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Like, I feel like some people are trying to take solace in the idea that there is a plan — even if it is a malignant one. That's much less scary than the reality, where the people steering the ship have no idea what they're doing.
Not trying to be glib or whatever and try and say that these people are actually harmless or not worth taking seriously. Quite the opposite: they're definitely exceptional. Just not in the way where they are playing five dimensional chess and we're not.

2025-04-03 20:56:10 UTC

I've seen some people on here post conspiratorial takes along the lines of: "the elites want to get us into a recession so they can buy everything for cheap."
That sounds scary and deliberate. But it completely ignores what we've seen from pretty much everyone in power: these are not smart people.
Most of the ruling class is not exceptionally bright or whatever. They have no idea what they're doing. Their sole defining characteristic is their extraordinary capacity for cruelty.

2025-04-03 19:05:25 UTC

WASI 0.2.5 has been released! No major changes. But noteworthy is that this was the first release which was almost entirely automated!
https://github.com/WebAssembly/WASI/releases/tag/v0.2.5

2025-04-03 13:19:07 UTC

Ohhhh, amazing work! - The next release of Wasmtime will have Wasm Component support for the `--profile` flag!
https://github.com/bytecodealliance/wasmtime/pull/10507
This will produce a `perf.json` file that can be read by the Firefox profiler. This is yet another step closer to having portable, language-agnostic instrumentation!

2025-04-02 19:24:16 UTC

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@nprofile…r88l
Smashing the boost button before even reading it because I know this is going to be good

2025-04-01 02:21:12 UTC

Decision tables map really well to match statements in Rust? The exhaustiveness checks performed by the compiler almost feel like they validate the model itself?
https://cdn.masto.host/tootyoshis/media_attachments/files/114/260/316/408/975/670/original/a9a9085b21662e15.jpeg

2025-03-31 18:50:49 UTC

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@nprofile…pej0
Disappointing, though unsurprising that after 25 years of right-wing governance in the Netherlands the state media might slant right

2025-03-31 13:36:33 UTC

I love how my "I'm going to the coffee shop to write a little"-setup is about the size of a couple of notebooks stacked on top.
I know iPads aren't the same as Cyberdecks, but if you add a split keyboard to it, it sure starts to feel close.
https://cdn.masto.host/tootyoshis/media_attachments/files/114/257/309/846/552/033/original/cfa4978f79b9467a.jpeg

2025-03-30 22:36:48 UTC

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@nprofile…508z congrats!

2025-03-30 22:30:24 UTC

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I’m thinking back to a previous gig where I was tasked evaluating the integration of a new database into our system.
I believe it required three separate containers to run the database. Of which at least one had what felt like, 200-300 different CLI options? Just pages upon pages of tunable parameters and configuration settings.
It felt that in order to effectively run the database you needed to understand the database internals. And we had nobody on our staff like that.

2025-03-30 22:01:58 UTC

lol, they're not wrong
(From "Feedback Control")
https://cdn.masto.host/tootyoshis/media_attachments/files/114/253/634/866/122/093/original/6c02a2de7cf46da7.png

2025-03-29 15:18:56 UTC

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Of course these results need to be reproduced to be fully generalized to countries outside of Greece. The concrete numbers may of course vary from place to place.
But intuitively this also makes a lot of sense. Waterborne and foodborne diseases are strictly controlled for. Surface-based transmission is by nature a lot less transmittable. It makes sense that airborne diseases, which have virtually no controls, are the main remaining vector.

2025-03-29 15:12:05 UTC

You know how memory safety issues are responsible for approx 70% of CVEs and that’s considered a huge deal and worth mitigating?
What if I told you diseases had a very similar stat. Where about 85% of all sick days can be attributed to airborne diseases:
https://mastodon.social/@augieray/114246182180851688

2025-03-28 20:30:23 UTC

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@nprofile…dg5x I don’t like any of this. Thank you for writing it

2025-03-28 13:16:15 UTC

Yeah yeah, white supremacists are morally repulsive etc. But do we talk enough about how boring they are?
None of the white supremacists actually seem to appreciate the things that make life worth living. Art, music, food, friends. They’re always around hating on things rather than enjoying new things. All the while putting themselves forward as supposed arbiters of good taste.
What taste? What imagination? I don’t think it’s an accident they’re all so boring and bland either.

2025-03-28 01:53:37 UTC

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@nprofile…sz89
Maybe this helps answer that? https://doc.rust-lang.org/stable/reference/lifetime-elision.html

2025-03-28 01:14:58 UTC

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For people wondering about the different meanings of ‘static:
- In references it means that the data pointed to by the reference lives for the remaining lifetime of the program.
- In trait bounds it means the type does not contain any non-‘static references.

2025-03-28 01:11:11 UTC

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Rust guides are generally pretty good about telling you about the three ways by which values can be passed (owned, shared ref, mutable ref). But it's far more rare to hear about the three kinds of lifetimes Rust has (covariant, contravariant, invariant).
And then there are lifetimes like ‘static that also have their own rules that can be tricky to get your head around. 'static also has different meanings depending on whether it's used in trait bounds or in references.
Lifetimes are not easy!

2025-03-28 01:01:19 UTC

Pointer Provenance and Lifetime Variance have a lot in common. Neither is directly encoded as part of a type; but the compiler very much cares about it, and needs you - as a programmer - to also care about it. Though it may not be forthright about wanting you to.

2025-03-27 01:05:32 UTC

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Survived release day. Very tired now. But also somewhat pleased about it.
It’s nice being able to actually show people what Wasm allows us to do. In this case: zap entire chunks of traditional compute stacks. It’s a lot of work; but we’re also just kind of proving that we can just do the work?

2025-03-26 14:41:44 UTC

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TLDR what this post is about
https://cdn.masto.host/tootyoshis/media_attachments/files/114/229/254/092/548/560/original/51021a96d6aa941c.jpeg
https://cdn.masto.host/tootyoshis/media_attachments/files/114/229/254/532/805/939/original/dd7a26f71e5ad0f8.jpeg

2025-03-26 14:24:19 UTC

New new new on the Microsoft OSS blog: We’ve released a Wasm Component guest for the Hyperlight hypervisor!
We talk a little about what this means and how it works on the blog. But tldr: we’ve made it possible to start new VM partitions, load a Wasm runtime, and start executing a Wasm Component binary in about ~1ms. No guest OS. No virtual devices. And I think that’s pretty cool!
https://opensource.microsoft.com/blog/2025/03/26/hyperlight-wasm-fast-secure-and-os-free/

2025-03-26 01:12:06 UTC

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It’s so fun. I’ve cast “recast special interest” and it just worked. Somehow!

2025-03-26 01:07:36 UTC

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Having entirely too much fun with this. Here’s another ^^
https://cdn.masto.host/tootyoshis/media_attachments/files/114/226/053/210/521/721/original/8e1e37168534af9a.jpeg

2025-03-25 20:05:59 UTC

sparks joy 😌
https://cdn.masto.host/tootyoshis/media_attachments/files/114/224/867/152/216/013/original/9cc95880e1ac6d3c.jpeg

2025-03-25 02:36:29 UTC

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@nprofile…hmrr
Both threads and tasks are unjoined by default. For either, if you drop the handle the work continues by the handle is now unreachable. Meaning the output is no longer directly observable. And in the case of async: the operation can no longer be cancelled.
See https://blog.yoshuawuyts.com/tasks-are-the-wrong-abstraction/ for more

2025-03-25 01:49:59 UTC

I’ve been reading more about control systems, and I’m now thinking: cancellation in async programming is a form of feedback control!
Structured concurrency is an attempt to create closed feedback loops where we can apply feedback control (add more work, cancel work) and always observe the output signal (return values, errors).
Unstructured concurrency (e.g. task::spawn) creates open-loop systems that can lose signal and cant always receive feedback. Which is inherently brittle and unstable.

2025-03-24 01:13:31 UTC

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(Somewhat keen to properly make my way through the control systems and concurrency books I’ve got in my library. Feel like I finally have the required context to re-read them more thoroughly.)

2025-03-24 01:05:59 UTC

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The only downside of this is that I meant to spend about half as much time on that today, and spend the rest of the day reading. Ah well.

2025-03-24 01:03:39 UTC

Spent about 7hrs in the kitchen today making food for the week. There’s something oddly soothing about just making things that is hard to replicate any other way.

2025-03-22 00:48:30 UTC

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Oooooops, confused author names. Different John than what I wrote in my original toot.

2025-03-21 23:38:42 UTC

In other news: I finished John de Goes’ book “a philosophy of software design” this week. Thought it was decent; I think he makes some solid points overall. Especially enjoyed the start where he tries to capture what complexity precisely is.
I suspect most practitioners with 10+ years in the field will know most of what the book says already, like intuitively. But not a bad read to have some of those things explicitly repeated back. Decent book overall imo!

2025-03-21 17:07:35 UTC

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@nprofile…w5ph @nprofile…lx87 hello and welcome! \o/

2025-03-21 01:14:43 UTC

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@nprofile…v3z4 I got the aranet one!

2025-03-21 00:13:36 UTC

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All we’re now missing are a radon and VOC meter.

2025-03-21 00:11:39 UTC

Air quality geekery intensifies: we now have a radiation meter in our living room!

2025-03-20 02:30:45 UTC

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@nprofile…v2wt love ittttt

2025-03-19 00:20:56 UTC

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@nprofile…tamy 🍋‍🟩 🍋‍🟩 🍋‍🟩 🍋‍🟩 🍋‍🟩

2025-03-17 01:10:52 UTC

Ohh fun, learned a new buzzword today: “continuous profiling”. It’s an observability thing where stack traces are captured and sent to the big logging database.
I can get behind this ^^

2025-03-16 17:49:15 UTC

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@nprofile…keqf not that I'm aware of, no

2025-03-16 13:26:26 UTC

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And the outcome of this system is not to replace diagnostic work — but to aid in initial assessment. Its initial data ingestion, that is prepared for review by a qualified physician.
Of course the quality of the implementation will matter. And there technology doesn’t exist in a social vacuum either. But architecturally this seems like it might actually work out quite nicely?