A 40-line fix eliminated a 400x performance gap

Re:A 40-line fix eliminated a 400x performance gap by jerrinot on Tuesday January 13, 2026 @08:47PM (#46611289)

Courtesy of Brendan Gregg and his flamegraph.pl scripts: https://github.com/brendangregg/FlameGraph

Normally, I use the generator included in async-profiler. It produces interactive HTML. But for this post, I used Brendan’s tool specifically to have a single, interactive SVG.

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Re:A 40-line fix eliminated a 400x performance gap by IshKebab on Wednesday January 14, 2026 @05:28PM (#46624689)

Note that pprof produces much fancier interactive flame graphs. I'm not sure they're a single SVG though.

Also `samply` and the Firefox profiler are pretty fancy too.

There's really no reason to use the original flamegraph scripts.

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