lean4/doc/perf.md

Using perf

On Linux machines, we use perf + hotspot to profile lean.

Suppose, we are in the lean4 root directory, and have a release build at build/release. Then, we can collect profile data using the following command:

perf record --call-graph dwarf build/release/stage1/bin/lean src/Lean/Elab/Term.lean

Recall that, if you have elan installed in your system, lean is actually the elan binary that selects which lean to execute.

To visualize the data, we use hotspot:

hotspot