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flamegraphs

Use when turning perf, DTrace, pprof, or async-profiler stacks into an SVG flamegraph with the FlameGraph scripts, reading one, or diffing two profiles. Not for collecting data: use linux-perf.

.devin/skills/flamegraphs/SKILL.md

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Sep 28, 2026
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Apache-2.0

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# Flamegraphs

A flamegraph draws every sampled stack as a column of frames, merges identical prefixes, and sets each frame's width to its share of samples. The x axis is sample share, not time order; the y axis is stack depth; colors carry no meaning unless a palette or a diff assigns one. The pipeline is always the same three stages: a profiler emits stacks, a `stackcollapse-*` script folds them to one line per unique stack with a count, and `flamegraph.pl` renders the SVG. The scripts live in `https://github.com/brendangregg/FlameGraph` and run from the checkout without an install step.

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The user has profiler output and wants an SVG, wants to read an existing flamegraph, or wants a before-and-after comparison of two profiles. |
| Authority | Reversible local: writes only the FlameGraph checkout, folded stack files, and SVG files in the working directory; rollback is deleting them. No remote mutation. |
| Side effect | Files on disk. No process is profiled by this skill; collection belongs to `linux-perf` or the profiler in question. |
| Done | The SVG exists, the widest leaf frame is named as the hotspot with its percentage, and, for a diff, the frames with the largest positive and negative change are named. |

## Inputs