Otherwise you can reach me atgh@felixge.de.

Last Update: 2022-09-19

• traceutils: Code for decoding and encoding runtime/trace files as well as useful functionality implemented on top.
• fgtrace: An experimental profiler/tracer that is capturing wallclock timelines for each goroutine. It's very similar to the Chrome profiler.
• cl: Quickly clone git repositories into a nested folders like GOPATH.
• pprofutils: Swiss army knife for pprof files. Implemented as a command line utility as well as free web service.
• gostackparse: A library that can parse Go stack traces at 300 MiB/s.
• sprof: A Go profiler based on static analysis. Note the release date.
• dd-trace-go/profiler: Working on this as part of my job for Datadog right now.
• go-profiler-notes: In-depth research and writing on the various Go profilers.
• sqlbench: A Go tool that measures and compares the execution time of one or more PostgreSQL queries
• fgprof: Experimental wall-clock profiler for Go.
• httpsnoop: Properly wraps thehttp.ResponseWriter interface in Go for monitoring.
• go-xxd: High performance Go implementation of the xxd utility. I got nerd sniped into this.
• godrone: Firmware for the Parrot AR Drone 2.0 written in Go, i.e. an experiment to physically visualize a garbage collector 😉
• tcpkeepalive: Exposes TCP keepalive knobs & dials. There are probably better alternatives now.

• flame-explain: Anonline PostgreSQL EXPLAIN visualizer written in React/TypeScript. I was very excited about this and scheduled to speak about it at various conferences. Then this pandemic thing happened and I burned out on the project : (.
• state-machines: A blog post showing how to implement state machines in PostgreSQL using user-defined aggregate functions.

Contributed100+ patches to the core involving promises, exception handling, fs, module system, UTF-8 (including apatch for v8). Mea culpa forprocess.on("uncaughtException") 🙈.

Additionally I wrote a lot ofNPM modules, most notably:

• mysql: Pure JS implementation of the binary MySQL protocol.
• formidable: A multipart/form-data parser that's pretty fast.
• node-ar-drone: Implementation of the networking protocols used by the Parrot AR Drone 2.0. This one got a bitout of control.
• node-style-guide: Not a module, but maybe it helped some people write better modules?

• tus: A protocol for resumable file uploads on the web that I wrote the initial version for. It's seen wide industry adoption since.

Contributed~150 patches to the core and made some good friends.

Here is a list of recent talks:

• Go Profiling and Observability from Scratch atGopherCon 2021 ・ Dec 8, 2021
• Continuous Go Profiling & Observability atP99 Conf ・Video ・Slides ・ Oct 6, 2021

You can find an incompletelist of previous talks on my website.

Going forward I'm actively looking for opportunities to present on Go profiling related topics.

I have an infrequently updatedblog where I givequestionable advise that ocassionallycompromises servers around the world.

My CV is available on request, but I'm not looking for a job right now.

• 2021-Now: Datadog, working on Continious Go Profiling.
• 2014-2020: Apple, working on secret manufacturing stuff using PostgreSQL and Go.
• 2013-2014: Thomson Reuters, contracted to work on Eikon Messanger XMPP server in Go.
• 2009-2013: Transloadit, co-founded the business and wrote lots of Node.js code until it was profitable.
• 2006-2008: Freelancer, working for international clients while finishing high school.

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1. fgproffgprofPublic

   🚀 fgprof is a sampling Go profiler that allows you to analyze On-CPU as well as Off-CPU (e.g. I/O) time together.

   Go 3k 98

2. mysqljs/mysqlmysqljs/mysqlPublic

   A pure node.js JavaScript Client implementing the MySQL protocol.

   JavaScript 18.4k 2.5k

3. node-style-guidenode-style-guidePublic

   A guide for styling your node.js / JavaScript code. Fork & adjust to your taste.

   JavaScript 5k 912

4. node-formidable/formidablenode-formidable/formidablePublic

   The most used, flexible, fast and streaming parser for multipart form data. Supports uploading to serverless environments, AWS S3, Azure, GCP or the filesystem. Used in production.

   JavaScript 7.1k 682

5. node-ar-dronenode-ar-dronePublic

   A node.js client for controlling Parrot AR Drone 2.0 quad-copters.

   JavaScript 1.8k 427

6. DataDog/go-profiler-notesDataDog/go-profiler-notesPublic

   felixge's notes on the various go profiling methods that are available.

   Jupyter Notebook 3.6k 214