jj v0.34 is out, including Gerrit upload support! github.com/jj-vcs/jj/re...

Watching "stupid jj tricks" from JJ con 2025 live right now. Tune in: www.youtube.com/watch?v=WWNh...

I need to start a critical path analysis art gallery soon. The kind of stuff goroutines get up to behind the scenes can be truly fascinating.

I'm starting to get better at leveraging AI agents for the kind of low-level stuff I'm doing sometimes. Example: Asked opus to explain some runtime internals, and then turn the analysis into a nice human-readable markdown output that I can use to explain a code change I'm making to a colleague.

Hi folks, it’s survey time! We’d love to learn more about how you use Go and what could be improved. Share your feedback via our annual developer survey at google.qualtrics.com/jfe/form/SV_.... It should take 10 - 20 minutes to complete, and will be open through September 30. Thank you! #golang

Profile.

My usual workflow is firing off the same query in ChatGPT 5 and Gemini 2.5 Pro these days. Typically they align, but one answer is better than the other. But it turns out no amount of AI can solve the "too many chefs in the kitchen" problem 😂.

This is a fantastic week. A lot of stuff I've been hoping to accomplish, and wasn't sure if I could, seems to finally be coming together. And to top it off, Spotify just pulled an incredible "Discover Weekly" playlist out of the hat. Good times 🎶

Managed to write a reproducer for a non-trivial bug last night. Old me would have been excited and stayed up late trying to fix it. These days I know this is the best time to go to sleep. And indeed, the solution came to me while falling asleep. Wrote it up this morning - works 👍🏻

I'm excited to see that github.com/florianl/go-tc reached 500 stars on GitHub! It all began as a way for me to explore loading an eBPF program in pure Go via the traffic control API of the Linux kernel, and it's awesome to see so many people finding it useful. Thanks everyone!

“jj undo can now undo multiple operations progressively by calling it repeatedly, whereas previously, running jj undo twice was previously a no-op (it only undid the last change).” 😮 It seems Christmas came early this year. github.com/jj-vcs/jj/re...

Gotta say @felixge.de has very top notch diagrams in this presentation! #golang #gopherCon

I just took my jj game to the next level by adopting the megamerge workflow. What it allows me to do is split a lot of my work into independent PRs (CLs), but work on a local tree that reflects the state of the repo as if all of them had already been merged.

NULL BITMAP: Using Huffman Coding for Sampling Discrete Distributions: buttondown.com/jaffray/arch...

⏳ ONE. WEEK. TO. GO. 🎉 The countdown is officially ON—#GopherCon is just around the corner! Don’t wait until the last minute—lock in your pass now and get ready to join us in NYC for the biggest #golang celebration of the year! 👉 www.gophercon.com #GopherConOrBust #GophersUnite

Having fun using pikchr to generate diagrams for my critical path analysis talk at GopherCon US.

The Go 1.25 change I am most excited about is the new synctest package. How I think about it is as a way to deflake tests by simulating an infinitely fast processor (because time doesn’t move until all work is done), and then shorten them by compressing time (because time jumps once it moves).

🎊 Go 1.25.0 is released! 📝 Release notes: https://go.dev/doc/go1.25 ⬇️ Download: https://go.dev/dl/#go1.25.0 #golang

Excellent blog post about hooking up Go into Java for erasure coding: kohlschuetter.github.io/blog/posts/2...

Why is your code allocating memory? How does the Go compiler see the world? Join Go contributor @thepudds.bsky.social for a deep dive into escape analysis—the part of the compiler that decides whether your data stays on the stack or takes the more expensive trip to the heap. 🎟️ www.gophercon.com

🧭 CPU profiling isn’t telling you the whole story. Let’s fix that! Join @felixge.de as he introduces a novel approach to analyzing Go request latency using critical path analysis—one that goes beyond traditional CPU profiling, logs, or traces. 🎟️ www.gophercon.com #GopherConOrBust #golang

Wrote up a small proposal to make it easier to test code that is processing #golang execution traces using the x/exp/trace package.

Few things are more cursed than the way VS Code extensions determine which local development tools to use. This is especially true when using remote hosts via ssh.

Check out this new blog post outlining how profiling is becoming the fourth pillar of observability 🚀. www.datadoghq.com/blog/continu...

German word of the day: Verschlimmbessern = "Trying to make something better, but actually making it worse in the process" A lot of engineering work falls into this category. Sometimes the answer is that there is value in leaving a problem unsolved.

Is anybody here able to put me in touch with somebody at Apple who could help with fixing setitimer(2) on macOS or figure out another approach to CPU profiling for Go and other user space programs? github.com/golang/go/is...

Fantastic new blog post from my colleague Nayef. If you're into Go internals, check it out! www.datadoghq.com/blog/enginee...

new blogpost about protobuf perf (work related!) mcyoung.xyz/2025/07/16/h...

uploading this classic clip for posterity buttondown.com/jaffray/arch...

Thanks @commaok.xyz for hosting @michael.express and I to talk about a fun bug in Go’s new Green Tea GC and the tools we used to investigate. sigpod.dev/6

A few ways to build Go programs with a modified compiler/runtime/standard library: nsrip.com/posts/patchr... Overlays in particular are pretty cool IMO

I'm working on an interactive Go 1.25 tour, but there are so many changes in json/v2 that I decided to cover them in a separate blog post. Plenty of interactive examples ahead! antonz.org/go-json-v2

I’m at #gopherconEU this week. Let’s chat if you’re here as well! #golang

Dear @github.com I'd love to use Copilot to perform natural language search against large code bases. But it does not seem to work, no matter what model I pick.

Finally, register spill jujutsu edition 🥳 .

New blog post! 🤓 jub0bs.com/posts/2025-0... #golang #iterator

What's up with the abysmal keyboard shortcut support amongst all the LLM vendors? If it wasn't such a PITA, I'd be switching between models much more frequently. But given the state of things, I mostly default to the most powerful model(s), even when I know it's overkill ...

Ian Lance Taylor deserves an award for the most patient person in Open Source. He also has an amazing ability to translate the clarity of his thinking into the written word. He has had such impact on the way people create software. I really hope he continues to contribute to Go.

I recently started using jj (h/t @prattmic.com), which is git-compatible version control system. Initially I was skeptical if it's worth the hassle, and there was indeed a learning curve. But man, I had no idea how much unprocessed git PTSD I was suffering from. jj is git trauma therapy ❤️

One interesting outcome of building AI applications/products (those on top of LLMs): o11y (observability) becomes SO important! You need to monitor, monitor, monitor; alert, alert alert!! This is b/c LLMs are nondeterministic: so you can forget automated testing. Big change

There's another try at bare metal support for #golang from the TamaGo folks. GOOS=none! Sample reply on the issue from @filippo.abyssdomain.expert: "running Go applications sandboxed as Firecracker micro VMs and writing memory-safe UEFI bootloader firmware in Go is extremely exciting to me."

New experimental garbage collector for Go programs! github.com/golang/go/is...

Another fun magic trick! Differential Coverage for Debugging research.swtch.com/diffcover

This is a real good article www.seangoedecke.com/wicked-featu...

PSA: runtime/debug.SetCrashOutput + GOMEMLIMIT can lead to OOM kills. This was fun to debug :). github.com/golang/go/is...

Wow, that's an insanely cool website: animejs.com/

I’ve filed a proposal to make GOMAXPROCS aware of container CPU limits by default! Please take a look and provide feedback if this is something you care about! go.dev/issue/73193

At this rate we're only a couple weeks away from hoarding toilet paper again. Lots of type II fun ahead of us.

Closely inspecting the list of tariffs/countries posted by the White House, Trump did not put tariffs on Russia. Ukraine's tariff is 10%, the EU's is 20%, and every American ally is on the list. But not Russia.

We will be at #KubeCon London April 2-4th 🚀 You too? Visit us at our booth, meet the team, chat about everything CUE and check out our Central Registry. Let us know if you will be around and we make sure a CUE caps awaits you: forms.gle/JbQ7jvLWBVL6...