rust-profiling
Profile Rust code using samply to identify CPU bottlenecks. Use when performance is slow, before optimizing, or when the user asks to profile.
Resources
3Install
npx skillscat add blacktop/dotfiles/rust-profiling Install via the SkillsCat registry.
SKILL.md
Rust Profiling with Samply
Profile Rust binaries to find CPU bottlenecks using samply.
Quick Start
# 1. Ensure profiling profile exists in Cargo.toml (see reference.md)
# 2. Build with debug symbols
cargo build --profile profiling
# 3. Profile (opens Firefox Profiler UI)
samply record ./target/profiling/<binary> [args...]
# 4. Or save for CLI analysis
samply record --save-only -o profile.json ./target/profiling/<binary>
python3 ~/.claude/skills/rust-profiling/scripts/analyze_profile.py profile.jsonSkill Files
| File | Purpose |
|---|---|
reference.md |
Cargo.toml setup, samply options, troubleshooting |
examples.md |
Common profiling scenarios and analysis patterns |
scripts/analyze_profile.py |
CLI tool to analyze saved profile.json files |
When to Use
- Performance is slower than expected
- Before optimizing (measure first!)
- After optimization (verify improvement)
- Investigating CPU-bound operations
What to Look For
| Pattern | Meaning | Action |
|---|---|---|
| High self-time | Function itself is slow | Direct optimization target |
| High total-time | Called often or slow callees | Check call frequency |
malloc/alloc in hot path |
Allocation overhead | Pool, arena, or stack allocate |
pthread_mutex/parking_lot |
Lock contention | Reduce lock scope or use lock-free |
Categories
Install
npx skillscat add blacktop/dotfiles/rust-profiling Install via the SkillsCat registry.