Carl Lerche

tokio.rsAnnouncing Topcoat: a framework for building full-stack reactive web apps with Rust | Tokio - An asynchronous Rust runtimeTokio is a runtime for writing reliable asynchronous applications with Rust. It provides async I/O, networking, scheduling, timers, and more.

22 July

Three years ago, trying to use Rust for web apps was crazy talk. Today is very different than three years ago. Announcing Topcoat, a batteries-included Rust framework for building reactive web applications: tokio.rs/blog/2026-07...

Carl Lerche reposted

NaNdi

@nandi.uk

17 July

Replying to @carllerche.com

I REALLY like that I have server controlled reactivity without the need to build wasm. People will underestimate what an amazing thing that is.

Carl Lerche reposted

Steve Klabnik

@steveklabnik.com

17 July

👀👀👀 github.com/tokio-rs/top... #rust-lang

github.comGitHub - tokio-rs/topcoat: A batteries-included framework for building web appsA batteries-included framework for building web apps - tokio-rs/topcoat

Carl Lerche reposted

Noah Kennedy

@nomaxx117.bsky.social

1 June

About a month ago I gave a talk at Tokioconf on what shared-nothing and work-stealing are, and how migrating our stack from nginx+lua to rust and tokio massively improved our performance ...because of work-stealing! check it out the recording here: www.youtube.com/watch?v=6QN3...

youtube.comTokioConf 2026 - From NGINX to Tokio: Lessons from rewriting a 55 million RPS system by Noah KennedyYouTube video by TokioConf

Carl Lerche reposted

TokioConf

@handle.invalid

1 June

The TokioConf 2026 talks are now available on YouTube: youtube.com/playlist?lis.... Also, TokioConf 2027 will be April 26 & 27, 2027 in Portland, OR. Save the date!

youtube.comTokioConf 2026 - YouTubeOrganized by the Tokio team to facilitate networking and knowledge exchange among engineers tackling similar challenges in Rust. A dedicated conference for d...

Carl Lerche reposted

Sean Klein

@smklein.bsky.social

1 June

my futurelock talk from #tokioconf is up! check it out, enjoy the story of a nightmare bug we saw at @oxide.computer

youtube.comTokioConf 2026 - Futurelock And You by Sean KleinYouTube video by TokioConf

github.comRelease Toasty v0.7.0 · tokio-rs/toastyHighlights Relations are now plain fields, with eager loading by default. The HasMany, HasOne, and BelongsTo wrapper types are gone. A relation field is just its target type, and whether you wrap i...

29 May

A big Toasty release (async ORM for Rust)! The relation declaration API improved, added support for multi-step relations, update! macro with ops like increment / add / push, and support for Turso. github.com/tokio-rs/toa... .

16 May

This undercurrent within the #rustlang community (and others) has to stop. The attacks on people simply because they are using developer tools that make them productive is 100% out of line. I can respect the anti-LLM arguments, but let's agree to disagree, respect each other as humans, and move on.

Amos Wenger@fasterthanli.me

prepping for rustweek, bracing to cross paths with all the people who decided to call me a booster/traitor/fascist for using LLMs, the people who blocked me without saying anything, the people who maintain lists of who to shun. a lot has happened in a year that I'm not done grieving about.

16 May

This is also why I'm being so open with my use of LLMs in the public #rustlang spheres and I will keep doing so. I have the ability (built up my thick skin over the years) and reputation to disregard the attackers, but many others don't.

16 May

It's probably too late to get an "I use LLMs" t-shirt...

reddit.comcarllerche's comment on "Toasty v0.6 (ORM) released. What's is new?"Explore this conversation and more from the rust community

I posted a bit about how I use LLM tools to boost productivity with a "complex Rust library" here: reddit.com/r/rust/comme.... If I motivate myself to do os, I will write some blog posts about my work flow.

github.comGitHub - tokio-rs/toasty: An async ORM for RustAn async ORM for Rust. Contribute to tokio-rs/toasty development by creating an account on GitHub.

I wrote a bit more about the release here: tokio.rs/blog/2026-05...

github.comgithub.com

Carl Lerche@carllerche.com

Released Toasty v0.6 (ORM for Rust). Highlights include `#[deferred]` to avoid having to load all fields all the time, `.select(...)` specify exactly which fields you want, and support for `Vec` fields, which is the start towards full "document" modeling. github.com/tokio-rs/toa...

github.comIssue · oven-sh/bunIncredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one - Issue · oven-sh/bun

I think the crucial questions are a) is it *worse* than it was before, safety wise b) how will correctness trend over time starting from now.

rain 🌦️@sunshowers.io

#30719 is a bit terrifying — they didn't even vibecode a CI check for Miri? Really concerned this is going to seriously harm Rust's reputation github.com/oven-sh/bun/...

If Bun, post RiiR merge has worse stability than before, then yeah, it was merged too early.

I will say that I am glad Bun is not a project I have to maintain though, I wouldn't have had the guts to switch languages so quickly.

github.comIssue · oven-sh/bunIncredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one - Issue · oven-sh/bun

I think the crucial questions are a) is it *worse* than it was before, safety wise b) how will correctness trend over time starting from now.

rain 🌦️@sunshowers.io

#30719 is a bit terrifying — they didn't even vibecode a CI check for Miri? Really concerned this is going to seriously harm Rust's reputation github.com/oven-sh/bun/...

I do know that long lived forks are a recipe for failure and if I had to port a large project from one language to another, I would also try to make the port as mechanical as possible, then iterate from there.

Got my new hat in time for Rust Week. See you there.

news.ycombinator.comRewrite Bun in Rust has been merged | Hacker News

Ferris by Dzuk, licensed CC BY-NC-SA: weirder.earth/@dzuk/102711...

github.comGitHub - tokio-rs/toasty: An async ORM for RustAn async ORM for Rust. Contribute to tokio-rs/toasty development by creating an account on GitHub.

I don't have anything to add to the Bun/Rust rewrite, except I notice that the post hasn't been removed from /r/rust as "not 100% human written" yet. Interesting... (not at all holding a grudge 😅)

ncameron.orgNicholas CameronNicholas Cameron is an experienced Rust engineer and educator offering Rust training, consultancy, and software development services.

12 May

I can too, the answer is: YES! (kidding). Nicholas is great, so reach out to him if you need help with Rust.

nrc@ncameron.org

I can help you assess if Rust is a good fit for your team or company, guide your Rust adoption, and help develop a Rust strategy. I have availability pretty much immediately, get in touch for a free chat: nrc@ncameron.org, or www.ncameron.org for more info.

11 May

Always fun when you come across someone who insists the only way to write reliable software is with a set of capabilities that happens to match what the Erlang VM provides. I guess everyone else is wrong.

9 May

What is the easiest way to set up automated AI agents (ideally Claude Code) that can react to GitHub events and submit PRs? For example, I want to auto-generate doc PRs for new functionality. GitHub Actions isn't ideal because CI doesn't trigger for PRs submitted from an action.

xunroll.comXunroll - Free Twitter Thread Reader & PDF ConverterRead, unroll and convert Twitter/X.com threads to PDF online without an account. Free thread reader tool.

9 May

The most surprising thing to me is the Rust port compiles faster than the Zig repo. I thought Zig focused on compilation speed. Does someone know why this would be? xunroll.com/thread/20530...

9 May

Being old means I'm excited for Friday night because nobody else will be swimming laps at the pool, and it will be quiet.

netstack.fmNetstack.FM® — A Podcast About Networking and RustInterviews, monologues, and deep dives into Rust and modern networking systems.

8 May

Gotta book stuff for my upcoming trip to Europe. But first, I need to warm up my finger for the "accept all cookies" click marathon.

Carl Lerche reposted

Plabayo BV

@plabayo.bsky.social

7 May

✨AI helps teams build faster. But sooner or later, something in production will behave unexpectedly -and that’s where visibility matters. On Netstack.FM Ep.37 we talk with Jess Izen and Russell Cohen from AWS on Dial9, a tool for seeing inside Rust and #Tokio apps. 🎧 netstack.fm#episode-37 #RustLang

github.comImproved experience using Tokio for both CPU-bound work and I/O work on the same machine · Issue #8085 · tokio-rs/tokioIs your feature request related to a problem? Please describe. Thanks First of all, Tokio is awesome, and shout out to my peeps @carllerche and @Darksonn for their amazing work on this crate. We us...

7 May

Great talk, which led to this follow up issue and discussion. github.com/tokio-rs/tok...

Andrew Lamb@andrewlamb1111.bsky.social

Using Tokio for CPU-Bound Tasks (Works Really Well) youtu.be/FeqRdDG1Y7g (has nothing to do with AI, just scheduling and Database plans)

youtu.beUsing Tokio for CPU-Bound Tasks (Works Really Well) May 2026YouTube video by Andrew Lamb

@andrewlamb1111.bsky.social

6 May

So, it is cheaper to fly PDX -> AMS -> CPH -> AMS than to fly PDX -> AMS, even though the first option takes the exact same flight.

Carl Lerche reposted

Andrew Lamb

5 May

Using Tokio for CPU-Bound Tasks (Works Really Well) youtu.be/FeqRdDG1Y7g (has nothing to do with AI, just scheduling and Database plans)

youtu.beUsing Tokio for CPU-Bound Tasks (Works Really Well) May 2026YouTube video by Andrew Lamb

5 May

The function coloring meme is one of those things that sounds true and is catchy if you don't think too hard about it. The reality is, there aren't two colors; there is a full gradient. Structure your code to best solve your problem.

5 May

Nobody talks about "what color is your data structure". One could write the exact same article about maps...

What if maintainers for OSS projects said: "If you want security patches in a timely fashion, you **must** pay a subscription. Otherwise, we will just disclose the issue, then make the patch public in ~30 days". You would all lose your minds, but it also points out you *expect* work for free.

Carl Lerche@carllerche.com

I'm just going to say it, I really don't like the "how do we make OSS sustainable" framing. OSS is already sustainable. The only thing not sustainable is users expecting a free lunch (support, LTS, bug fixes, ...). As a user, you are responsible for your OSS usage. Fork/patch if you need to.

This might be something that happens w/ the EU cyber resilience act. Granted, I just skimmed the content, but I am excited to see what happens.

Every time an OSS maintainer adds a "funding" notice to their post-install, deletes their package, or doesn't merge a bug fix, and "the community" gets angry and calls it a bad action, that's the problem.

Carl Lerche@carllerche.com

If you want support, pay for it. And no, donating $20/mo, is not the answer. It costs more to take an OSS project and turn it into a product that businesses can depend on.

It's fine to highlight technical issues and crowdsource a knowledge base on the state of each dependency. But remember: OSS is published WITHOUT WARRANTY.

Carl Lerche@carllerche.com

The problem is that we, "the community," have an expectation from devs who make their code open. And no, it's not on them to put disclaimers in their README.

OSS authors are not businesses. Don't expect anything, and take ownership of the OSS you pull in and use.

Carl Lerche reposted

James Munns

@jamesmunns.com

2 May

I don't have a totally coherent view on this, but having spent time in this space, OSS funding is just *weird*. Users treat popular projects like products, and how software gets done somewhat reinforces that (packaging, "the ecosystem", etc.). A very tiny # of people do (or even could!) make money.

Carl Lerche@carllerche.com

This is not to say we shouldn't explore ways to crowd source bug fixing, support, etc... but that is all bonus and not a requirement to be "sustainable".

2 May

That said, based on my quick read of the information out there on the Cyber Resilience Act, I think it might end up being decent. It clearly places the onus on the companies building products with OSS.

29 Apr

I'll be at #RustWeek next month. Always happy to chat Tokio, Toasty, Rust ORMs, or web apps in Rust. Say hi if you're around.

29 Apr

These days, I could probably build a web app to book airline travel faster than I can book a flight through corporate travel portals.