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rust100k-build-performance

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更新日2026年7月11日 01:50

Apply Matklad Rust100k build-time, inline, workspace, and generic-boundary guidance to eph. Use when changing Rust crate structure, public generic APIs,

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attunehq

attunehq/doteph

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Rust100k Build Performance

Keep Rust build time and hot-path performance visible together. This skill covers Matklad's Inline In Rust, Large Rust Workspaces, and Fast Rust Builds posts, with eph's small-project conflict decisions documented in .agents/skills/readme.md.

Workflow

Measure before tuning. For runtime changes use targeted command timings or smoke runs; for build changes use cargo timings, CI duration, or cargo metadata plus targeted cargo commands.
Treat #[inline] as cross-crate body exposure, not a magic speed switch. In applications, add it reactively after profiling or for tiny public wrappers.
Keep #[inline(always)] rare and evidence-backed. Prefer #[cold] or #[inline(never)] for error/cold paths only when profiling or layout concerns justify it.
For ergonomic generic public APIs, keep the generic wrapper thin and delegate immediately to a concrete implementation when compile-time bloat matters.
For eph's single-crate shape, prefer impl Trait or generics when they improve clarity or runtime performance. Split crates only when measurements or independent ownership boundaries justify it.
If eph becomes a workspace, use a flat crates/* layout, a virtual root manifest, folder names matching crate names, and a dedicated automation crate rather than scattered scripts.
Run cargo fmt --check, cargo test, and cargo clippy --all-targets -- -D warnings.

eph policy

Keep cargo fmt --check, cargo test, and cargo clippy --all-targets -- -D warnings as the ordinary gate.
Keep clippy lint groups in the crate roots explicit so the policy is visible outside the Git hook and Makefile.
Do not add compile-time-heavy abstractions for hypothetical reuse.
Prefer concrete data boundaries in shared internals, but allow impl Trait where it improves current clarity or runtime performance.
Treat release profile tuning as a measured change; document before/after latency and build-time impact.

Validation

cargo fmt --check
cargo clippy --all-targets -- -D warnings
cargo test -- --test-threads=1

Generic boundary and inline tradeoffs remain review rules. The crate-level lint attributes and CI commands are the executable policy.

Read references/article-notes.md for source notes and tool suggestions.

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Rust100k Build Performance

Workflow

Measure before tuning. For runtime changes use targeted command timings or smoke runs; for build changes use cargo timings, CI duration, or cargo metadata plus targeted cargo commands.

Treat #[inline] as cross-crate body exposure, not a magic speed switch. In applications, add it reactively after profiling or for tiny public wrappers.

Keep #[inline(always)] rare and evidence-backed. Prefer #[cold] or #[inline(never)] for error/cold paths only when profiling or layout concerns justify it.

For ergonomic generic public APIs, keep the generic wrapper thin and delegate immediately to a concrete implementation when compile-time bloat matters.

For eph's single-crate shape, prefer impl Trait or generics when they improve clarity or runtime performance. Split crates only when measurements or independent ownership boundaries justify it.

If eph becomes a workspace, use a flat crates/* layout, a virtual root manifest, folder names matching crate names, and a dedicated automation crate rather than scattered scripts.

Run cargo fmt --check, cargo test, and cargo clippy --all-targets -- -D warnings.

eph policy

Keep cargo fmt --check, cargo test, and cargo clippy --all-targets -- -D warnings as the ordinary gate.

Keep clippy lint groups in the crate roots explicit so the policy is visible outside the Git hook and Makefile.

Do not add compile-time-heavy abstractions for hypothetical reuse.

Prefer concrete data boundaries in shared internals, but allow impl Trait where it improves current clarity or runtime performance.

Treat release profile tuning as a measured change; document before/after latency and build-time impact.

Validation

cargo fmt --check cargo clippy --all-targets -- -D warnings cargo test -- --test-threads=1

Generic boundary and inline tradeoffs remain review rules. The crate-level lint attributes and CI commands are the executable policy.

Read references/article-notes.md for source notes and tool suggestions.

name	rust100k-build-performance
description	Apply Matklad Rust100k build-time, inline, workspace, and generic-boundary guidance to eph. Use when changing Rust crate structure, public generic APIs,