Landed a set of LLDB & GDB plugins in V8 to help inspect JS states in a live process/coredump together with native states ✨ The initial implementation just supports JS stack trace annotations in bt; support for object inspection is coming up! chromium.googlesource.com/v8/v8.git/+/...

I put together a little set of recipes for generating Debian images for amd64, arm64, armhf, ppc64el, riscv64, s390x, ppc64be, and loong64 that are bootable in qemu-system - all done rootlessly, with the rootless debootstrap wrapper I shared a while ago muxup.com/2026q2/boota...

Travelling to Dublin for EuroLLVM today - looks like a great line-up of talks. Hopefully see some of you there!

The new util-linux release has a 'getino' utility to retrieve the inode number associated with a PID, and various other utils are updated to accept pid:inode format. This gives a pretty handy no-effort solution to PID wraparound www.kernel.org/pub/linux/ut...

This must've been one of the most challenging things I've worked on in a while. Thanks Bloomberg for sponsoring my work on this, and everyone who helped shipping a fix in time!

That's a wrap on WASM.io Barcelona! Saúl Cabrera presented "Beyond Performance: 5 Years of Improving JavaScript on WebAssembly" — half a decade of deep work making JS faster inside Wasm runtimes. Great to connect with the WebAssembly community. 2026.wasm.io/sessions/bey... #WebAssembly #WasmIo

Big news! Igalia (@igalia.com) is partnering with @eurosky.social to develop the next generation of the open social web. Let's stop waiting for others to fix our problems and start fixing them ourselves. We can just do things. More: www.eurosky.tech/s/Eurosky-Ig...

Tomorrow at Embedded World! Hall 4, Booth 4-443. Demoing Moonforge — live OTA updates on RPi5 via RAUC — plus a Zephyr BLE app built entirely on upstream code, and WPE WebKit on embedded hardware. Talks: Tue 14:45 Yocto best practices, Thu 15:00 web engines for embedded. #EmbeddedWorld #ew26

Some additional datapoints on per-query energy consumption of LLMs across a selection of newer models, thanks to figures from Lambda's model cards muxup.com/2026q1/minip...

Some additional datapoints on per-query energy consumption of LLMs across a selection of newer models, thanks to figures from Lambda's model cards muxup.com/2026q1/minip...

There are many tools for unprivileged sandboxing on Linux. You should probably go use one of them. But I wrote shandbox to scratch my itch muxup.com/shandbox /home/$user/sandbox shows up as /home/sandbox within the shared sandbox, which otherwise can only access explicitly mapped files/dirs.

There are many tools for unprivileged sandboxing on Linux. You should probably go use one of them. But I wrote shandbox to scratch my itch muxup.com/shandbox /home/$user/sandbox shows up as /home/sandbox within the shared sandbox, which otherwise can only access explicitly mapped files/dirs.

The EC is putting together an initiative to develop their strategy for open digital ecosystems. Given its potential to push forward the development and funding of open-source software in Europe and beyond, Igalia submitted a response with some suggestions. Read more: www.igalia.com/2026/02/03/I...

Wrote a blog post about the work I've been doing at @igalia.com to implement the Temporal proposal in JavaScriptCore: blogs.igalia.com/compilers/20...

One of the nice parts of #llvm is that often times you'll find yourself needing to do some sort of non-trivial analysis, but usually there's already a pass for it. Here's how you can reuse a block frequency analysis to make a chess engine 7% faster on #riscv: lukelau.me/2026/01/26/c...

New blog post on the journey of the new --build-sea flag and how SEA injection works joyeecheung.github.io/blog/2026/01...

Thanks for the helpful auto-complete, Gmail.

2% of Golang 2025 survey respondents are deploying their Go software to RISC-V. Take that, s390x! go.dev/blog/survey2...

If you're thinking of applying to PLISS, you've got three days left! pliss.org/2026/registr...

2% of Golang 2025 survey respondents are deploying their Go software to RISC-V. Take that, s390x! go.dev/blog/survey2...

This release contains a bunch of PRs I recently submitted to mark features I contributed to as stable/release candidate. Here is a thread about them 🧵:

A video and notebook on a short Introduction to SMT solvers colab.research.google.com/github/philz... www.youtube.com/watch?v=cI2s...

64% of WebKit non-Apple contributions, 20% of Chromium non-Google, 27% of Servo, 39% of test262, and it goes on. And doing all this as a worker-owned, employee-run cooperative. The world would be a very different place if companies like Igalia were the norm rather than the exception in tech.

Nikita Popov (who sadly isn't on Bluesky) has a great new post. LLVM: The bad parts www.npopov.com/2026/01/11/L...

The move to 'forkserver' as the default start method for ProcessPoolExecutor in Python 3.14 is quite a gotcha docs.python.org/3/whatsnew/3... My code was probably broken on MacOS and Windows anyway due to those platforms defaulting to the 'spawn' method.

If we try to use the benchmark results from InferenceMAX to calculate a Watt-hours per LLM query, what do we get? What potential issues are there with the benchmark for this purpose (or in general)? My new post explores this muxup.com/2026q1/per-q...

If we try to use the benchmark results from InferenceMAX to calculate a Watt-hours per LLM query, what do we get? What potential issues are there with the benchmark for this purpose (or in general)? My new post explores this muxup.com/2026q1/per-q...

LLVM Weekly - #627, January 5th 2026. Twelve years of LLVM Weekly, EuroLLVM CfP closing soon, GNU toolchain in 2025 summary, PCH to speed-up LLVM builds, LLVM ABI lowering library starting to land, and more llvmweekly.org/issue/627

Finished two retrospective blog posts on the journey of require(esm) before 2025 ends: joyeecheung.github.io/blog/2025/12... joyeecheung.github.io/blog/2025/12...

Wake up babe, new proposed RISC-V base ISA names just dropped. lists.riscv.org/g/tech-unpri... How long until we see an rv32lbefx_mafc_zicntr_zicsr_zifencei_zba_zbb_zbs_zca_zfa in the wild?

There has been outrage as the @acm.org rolls out AI generated summaries of papers. This is doing AI exactly wrong by replacing valuable, peer-reviewed content with a possibly inaccurate summary. It's still not too late to correct it though and use AI responsibly... anil.recoil.org/notes/acm-ai...

The #LLVM developer room is back at #FOSDEM , on January 31st! I'm excited about the variety in topics covered, from hardware generation using mlir/llvm to C/C++ repls. Come join us either in-person in Brussels, or online through the live-feed which will be available at fosdem.org/2026/schedul...

For my last few days of my Advent of Agentic Humps, I blended 50 different language ecosystem's HTTP clients to brew an OCaml Requests library. Agents figured out the random quirks needed for a client by getting advice from our friends in Java, Haskell, C, C#, Python anil.recoil.org/notes/aoah-2...

What a week! 😅 #LinuxPlumbers Conf 2025 is officially over, and what an edition it was. We went all out this year, covering everything from Linux System Observability and Kernel Testing to Gaming and sched_ext! Thanks to the organizers and everyone who joined our eight talks. See you next year! 👋🐧

Does LLVM produce slower RISC-V code than GCC? Currently, yes. Can we make LLVM produce faster code? Also, yes! lukelau.me/2025/12/10/c... #llvm #riscv

We''ve landed a few more talks since the last update! * Sorrachai Yingchareonthawornchai: The CSLib initiative * Simon Sorg: Machine learning for Lean * Jannis Limperg on Lean metaprogramming for AI * Will Turner on the new ProofBench effort Come join us for a day of #lean! leaning.in

I've started writing up the flow I use for capturing instruction execution frequency data from benchmarks using QEMU. First we focus on getting the necessary stats out of QEMU. Future posts will look at the scripting I use for analysis, and then examples of applying it. muxup.com/2025q4/qemu-...

I've started writing up the flow I use for capturing instruction execution frequency data from benchmarks using QEMU. First we focus on getting the necessary stats out of QEMU. Future posts will look at the scripting I use for analysis, and then examples of applying it. muxup.com/2025q4/qemu-...

I feel like I should implement footnotes on my blog, but I know I'll overuse them awfully (maybe that's preferable to my overuse of parenthetical comments though?) ^1 [1]: Or perhaps just equally annoying but in a different way

Some notes on the reported training costs (GWh for pre-training GPU compute) for the recently released @ai2.bsky.social Olmo 3 along with my attempt to contextualise that. muxup.com/2025q4/minip... 0.681 GWh for the GPUs in pre-training the 32B (not accounting for cooling etc).

We just extended the deadline for the #LLVM dev room at #FOSDEM submissions until 7th of December. There's still time to make your submission at pretalx.fosdem.org/fosdem-2026/... ! Full CFP at discourse.llvm.org/t/88746

A little benchmark of the Hetzner AX102 dedicated server vs the similarly sized Hetzner CCX53. Also includes my recipe for installing Arch on the VPS from the rescue environment muxup.com/2025q4/minip...

A little benchmark of the Hetzner AX102 dedicated server vs the similarly sized Hetzner CCX53. Also includes my recipe for installing Arch on the VPS from the rescue environment muxup.com/2025q4/minip...

The recent thread from @simonwillison.net made me dig out and write up notes on inference vs training GPU hours for DeepSeek V3/R1 based on their published data muxup.com/2025q4/minip... Tldr: something like ~70 days of inference traffic (from DeepSeek) to match the training GPU hours for V3 and R1.

Was looking at some older slides and found a claim that copying text around for a text editor is only practical for <256chars. It's Friday, let's see whether this is a "current" assessment, considering only the text, and none of the other things an editor does.

Yikes, OpenReview had a bug that exposed the anonymous reviewers, authors, and area chairs. openreview.net/forum/user%7... For those not familiar: it's a tool allowing running a double-blind review process (think HotCRP, EasyChair etc) except review comments and author responses are all public.

I'm doing a live Reddit AMA today at 2pm ET! Come ask me about PL, SE, the Master of Software Engineering program I run, Open Access at ACM, my music education startup Noteful, or my silly YouTube video outfits! www.reddit.com/r/IAmA/comme...

I've uploaded the slides of my recent talk "JS Engine Security in 2025": saelo.github.io/presentation.... I think there'll also be a recording available at some point (otherwise I can make one as not everything's in the slides). Fantastic conference as usual, big thanks to the PoC Crew!

Announcing Olmo 3, a leading fully open LM suite built for reasoning, chat, & tool use, and an open model flow—not just the final weights, but the entire training journey. Best fully open 32B reasoning model & best 32B base model. 🧵

Benchmarking Language Implementations: Am I doing it right? Get Early Feedback! stefan-marr.de/2025/11/expe... MoreVMs'26 is looking for submission of "experimental setups" to help language implementation researchers to avoid common benchmarking pitfalls. Submit something either Dec 17 or Jan 12.