Felix Geisendörfer
@felixge
Software Engineer @datadoghq working on Go Profiling, Performance, OpenTelemetry and more. Before: @Apple, Co-founder @transloadit, @nodejs core dev
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🚀 Would you like to improve the latency of your Go apps? In the video below I'll walk you through 5 optimizations using @datadoghq's new profiling timeline feature. Finding and fixing those problems would have been really hard with other tools ✨. youtu.be/6MOtFkl2tq0
youtube.com
YouTube
Optimizing Go Request Latency with Datadog's Profiling Timeline
I love Zstd. It is my default goto for anything compression related: it has a sweet spot between availability (it’s now standardized!! RFC8478), complexity, performance and compression ratio. My favorite thing about it are the skippable frames. Just a killer feature. It’s not…
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 😂.
Having fun using pikchr to generate diagrams for my critical path analysis talk at GopherCon US.
🧭 CPU profiling isn’t telling you the whole story. Let’s fix that! Join @felixge 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. You’ll learn how to root out hidden…
The unsexy truth for the build in public hypeboys is that its not a lot of work or time to get a sexy demo, but it is a lot of work and time to translate that into meaningful value (a lot of that being non-technical). And I see too many people repeatedly celebrating the demo.…
Very 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 🚀. datadoghq.com/blog/continuou…
datadoghq.com
Why continuous profiling is the fourth pillar of observability | Datadog
Learn how modern continuous profilers have transformed profiling into a core observability practice.
Just released async-profiler 4.1 is compatible with JDK 25, adds OpenTelemetry Profiles Data format, improves Native Memory profiling and includes numerous other enhancements: github.com/async-profiler…
This is a great summary of the history of Go’s garbage collector, and a small glimpse into why Go became so prevalent in the distributed systems space so quickly
The story of Go's garbage collector is one of the most remarkable engineering transformations in modern computing that I have ever studied about. When Go launched in 2009, its garbage collector would freeze applications for literal seconds, making it unusable for any serious…
I’m at #gopherconEU this week. Let’s chat if you’re here as well! #golang
PSA: runtime/debug.SetCrashOutput + GOMEMLIMIT can lead to OOM kills. This was fun to debug :). github.com/golang/go/issu…
github.com
runtime/debug.SetCrashOutput + GOGC=off + GOMEMLIMIT can lead to OOM kills · Issue #73490 ·...
We recently noticed some OOM kills, and after a fun debugging adventure involving core dumps, we concluded that the issue was caused by our usage of the SetCrashOutput API which mirrors the example...
Periodic callout to Jackc's Pgx, which is *absurdly* solid software. Every time I think I've found a bug in it, it turns out to actually be my fault. It just happened again for like the 50th time. github.com/jackc/pgx
github.com
GitHub - jackc/pgx: PostgreSQL driver and toolkit for Go
PostgreSQL driver and toolkit for Go. Contribute to jackc/pgx development by creating an account on GitHub.
We think tariffs are about bringing back manufacturing. Talk to small businesses first
At this rate we're only a couple weeks away from hoarding toilet paper again. Lots of type II fun ahead of us.
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