| name | profiling |
| description | Profile Lean programs with demangled names using samply and Firefox Profiler. Use when the user asks to profile a Lean binary or investigate performance. |
| allowed-tools | Bash, Read, Glob, Grep |
Profiling Lean Programs
Full documentation: script/PROFILER_README.md.
Quick Start
script/lean_profile.sh ./build/release/stage1/bin/lean some_file.lean
Requires samply (cargo install samply) and python3.
Agent Notes
- The pipeline is interactive (serves to browser at the end). When running non-interactively, run the steps manually instead of using the wrapper script.
- The three steps are:
samply record --save-only, symbolicate_profile.py, then serve_profile.py.
lean_demangle.py works standalone as a stdin filter (like c++filt) for quick name lookups.- The
--raw flag on lean_demangle.py gives exact demangled names without postprocessing (keeps ._redArg, ._lam_0 suffixes as-is).
- Use
PROFILE_KEEP=1 to keep the temp directory for later inspection.
- The demangled profile is a standard Firefox Profiler JSON. Function names live in
threads[i].stringArray, indexed by threads[i].funcTable.name.
