Rust Profiling

Covers the full performance profiling stack for Rust: cargo-flamegraph for CPU profiles, cargo-bloat for binary size breakdowns, cargo-llvm-lines to catch monomorphization explosions, and Criterion for proper microbenchmarking. The workflow guides you through build profiles with debug symbols, interpreting flamegraph output with Rust's inlined frames, and the thin-wrapper pattern to reduce code bloat from generics. It also connects to perf and heaptrack when you need lower-level tooling. Straightforward and pragmatic. Use this when your Rust program is slow or fat and you need to figure out why.

skills.sh installs: 673
GitHub stars: 279
last updated: Aug 21, 2026

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Install

$ npx -y skills add mohitmishra786/low-level-dev-skills --skill rust-profiling --agent claude-code

Installs into .claude/skills of the current project.

Files

Rust Profiling

Purpose

Guide agents through Rust performance profiling: flamegraphs via cargo-flamegraph, binary size analysis, monomorphization bloat measurement, Criterion microbenchmarks, and interpreting profiling results with inlined Rust frames.

Triggers

"How do I generate a flamegraph for a Rust program?"
"My Rust binary is huge — how do I find what's causing it?"
"How do I write Criterion benchmarks?"
"How do I measure monomorphization bloat?"
"Rust performance is worse than expected — how do I profile it?"
"How do I use perf with Rust?"

Workflow

1. Build for profiling

# Release with debug symbols (needed for readable profiles)
# Cargo.toml:
[profile.release-with-debug]
inherits = "release"
debug = true

cargo build --profile release-with-debug

# Or quick: release + debug info inline
CARGO_PROFILE_RELEASE_DEBUG=true cargo build --release

2. Flamegraphs with cargo-flamegraph

# Install
cargo install flamegraph

# Linux: uses perf (requires perf_event_paranoid ≤ 1)
sudo sh -c 'echo 1 > /proc/sys/kernel/perf_event_paranoid'
cargo flamegraph --bin myapp -- arg1 arg2

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