Ivo Anjo

I've written a new #Ruby blog post investigating why running a mix of network requests (or any kind of IO) and CPU work can result in awful performance. Ruby's thread scheduling can be quite unfair in these cases: ivoanjo.me/blog/2023/02/1…

At @datadoghq we've just published a blog with insights on #ruby performance based on surveying profiler data from thousands of real-world services: datadoghq.com/blog/ruby-perf…

@nateberkopec If you happen to still have that profile around, I'd love to take a peek at it :)

@nateberkopec 👀 interesting. The start timestamp for "Waiting for GVL" should be exact, it gets recorded immediately when we get the event. I'd be curious to see what came before in the thread; perhaps a small amount of cpu work prior to waiting made the previous sample be assigned as cpu.

@KnuX just a heads up I'm seeing datadog profiler output that says a thread is "waiting on gvl" where it's clearly waiting on io at least part of the time

@LambrosPetrou Hah you know me and weird tech :D

@KnuX NICE! I still learn the weirdest things from you :)

I'll be at #brightonruby today, come say hi and chat about #ruby and performance and profiling and #datadog! (And phones with physical keyboards?)

@MarmiteJunction Neither! Check out clicks.tech and I'm totally not paid by them 🤣 I don't even have an officially supported phone

@KnuX Built in, or Bluetooth?

@LambrosPetrou I'm using a clicks.tech that I adapted to a Samsung Galaxy Flip 6 ;) It's a really cool combo haha

@KnuX Still on those phones, huh 😅 Are they even still sold?

I'll be speaking at EuRuKo in September! Really cool to see big Ruby conferences again in Portugal!

Finally got to visit the #datadog Tokyo office today! Sakura themed, as expected!

We're thrilled to be back at @rubykaigi as a Ruby Sponsor & host of the Ruby Committers event last night! 🇯🇵 🎉 The Ruby & Rails Infrastructure team at @Shopify have lots to share, including a new JIT compiler, new Ruby LSP APIs for handling DSL, and performance optimizations. Until then, check out what we're working on at railsatscale.com and shopify.engineering. #rubykaigi

As @hachiblog pointed out during the lighting talk, some gems are not (yet) compatible with the fiber scheduler, but this relatively small PR will fix the issue: github.com/grpc/grpc/pull…

道後公園展望台にふらっと行ったら @KnuX がいたので、スピーチよかったです、datadog 便利に使ってるよありがとうと伝えて写真を撮ってもらった！ It's good to see you. Thank you!! @KnuX #rubykaigi

Slides for my #rubykaigi #rubykaigi2025 talk "Performance Bugs and Low-level Ruby Observability APIs" are up on dtdg.co/rubykaigi2025 :)

＼ 💎 #rubykaigi 2025 Day2 ／ スタメンブース、引き続きオープンしています！ 当たりはAnkerの充電器、参加賞にはチョコレートをお渡ししています！🍫 引き続きブースでお待ちしています！ #TUNAG #RubyKaigi2025

@nateberkopec Very interesting! I wouldn't expect the difference here -- I took a look and left a comment on the issue as well :)

@KnuX just FYI. i'm more inclined to think this is a problem with gvl_timing than your profiles, which look accurate to me github.com/jhawthorn/gvl_…

Have you ever struggled with debugging memory leaks or OOM kills in Java or Go? My team at @datadoghq has recently shipped a guided memory leak workflow that can quickly guide you through the right steps to find and fix the problematic code.

Because @fxn doesn't stop at simple explanations, I went to dig into why this benchmark give the opposite results of what one would expect 🧵

The fix for this has landed and will be in go1.24 as well as the next minor release for go1.23 🎉. Thanks to the Go team for the fast review as usual 🙇🏻‍♂️

Good news everyone! 🎉 After two years of R&D, we've finally merged the Bytecode DSL into master! Truffle now generates bytecode interpreters from AST-like specifications for you. ASTs are dead, long live bytecodes! Check it out: github.com/oracle/graal/b…

🌟 Save the Date! 🌟 EuRuKo 2025: The HeART of Code 📅 September 18-19, 2025 📍 Viana do Castelo, Portugal Join us for the European Ruby Conference in a beautiful coastal city, where innovation meets culture. 👉 Learn more: 2025.euruko.org #EuRuKo2025 #VianaDoCastelo