Flame graphs

folded collapsed

A folded stack profile — one line per distinct stack with its sample count, the format FlameGraph's stackcollapse scripts write — opens as a flame graph.

• The three hottest functions are named at the top, and outlined in the flame.
• A timeline of the samples, in the order the file lists them, that you can drag across to look at one run of them. Esc puts the whole profile back.
• The flame, root at the bottom or at the top, with idle threads hidden by default so the work is not buried under the waiting.
• The full stack of whatever the pointer is on, each frame with two percentages: this call site, and the same function summed over every call site.

When the file's first line is a # comment holding JSON metadata, the profile is read in milliseconds instead of samples.

Next: keyboard shortcuts.