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Felix Geisendörfer

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Profiling Request Latency with Critical Path AnalysisGopherCon 20252025-08-26
Uses the Go execution tracer and a backward critical path analysis to turn raw scheduler events into per-request profiles that expose off‑CPU waits—mutex…
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How to Win Frames and Influence PointersGopherCon Europe 20242024-06-17
Datadog contributions plus collaboration with the Go runtime team replace slow unwind-table stack walking with frame pointer unwinding, cutting stack-trace…
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Go Profiling and Observability from ScratchGopherCon 20212021-12-05
Simple Go runtime model plus hands-on tools: CPU, memory, block, mutex, goroutine profilers and the runtime tracer, plus eBPF (bpftrace), Linux perf, Delve and…
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GopherCon 2021 - Day 1GopherCon 20212021-12-05
Go 1.18 brings generics: type parameters, type sets with the tilde token, and type inference so you can write a single binary-tree or mean function usable…
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GoDrone: Writing a Quadcopter firmware in GodotGo 20142014-10-10
Parrot AR Drone 2.0 runs a Go-written firmware that is cross-compiled to ARM and temporarily swapped over the stock process, driving sensors and motors at a…
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Faster than C? Parsing Node.js Streams!JSConf EU 20122012-10-06
A pure-JS MySQL parser reaches parity with libmysql C bindings and shows a 2x improvement in parts (benchmarks jump from ~350k to ~450k rows/sec). Development…
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How to Test Asynchronous CodeNodeConf 20112011-05-05
Argues that asynchronous code becomes testable by making logic no IO and injecting test doubles, with tools: node-fake for mocks and node-microtest to run each…
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Dirty NoSQLJSConf.eu 20102010-09-25
A tiny Node.js key value store called Dirty uses an embedded append-only newline-JSON file with no networking or indexes and batches writes from an in-memory…
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