Critical-path math (cargo workspace 105 crates × 3 matrix targets):
- Current profile: opt-level=z + lto=true + codegen-units=1 = compile
cost ~10-20× over default; observed wall-time ~17min/release run
- After P1+P2 stack: predicted ~4-5min cold, ~1.5min warm
== P1 — _primitives/_rust/Cargo.toml profile.release ==
- lto: true → "thin" (full LTO is 3-5× slower; thin keeps most opts)
- codegen-units: 1 → 16 (parallel codegen restored, was serial)
- Binary size cost: ~10-15% larger (acceptable for non-embedded targets)
- VERIFIED: cargo check --workspace exits clean
[REAL: ran in this session; 0 errors, warnings only]
== P2 — mold linker for Linux targets ==
- New: _primitives/_rust/.cargo/config.toml (7 LOC)
* x86_64-unknown-linux-gnu + aarch64-unknown-linux-gnu use clang+mold
* macOS targets unaffected (use system ld + LLVM)
- New step in .github/workflows/release.yml::build-release:
Install mold linker (Linux only) — apt-get mold clang
Gate: `if: contains(matrix.target, 'linux')`
- Inserted AFTER rust-toolchain BEFORE rust-cache
- Predicted gain: link phase 60s → 6s on Linux entries
== P3 — explicitly NOT applied ==
- Path-filter on docs-only commits considered + rejected per task spec:
Release tags should always rebuild even if commit only touches docs.
Files:
- _primitives/_rust/Cargo.toml (+2/-2 LOC)
- _primitives/_rust/.cargo/config.toml (NEW, 7 LOC)
- .github/workflows/release.yml (+5/-0 LOC, mold install step)
[ESTIMATE-HTC: rustc + mold benchmarks claim 3-5× and 5-10× respectively
on full release builds — not re-benchmarked on this 105-crate workspace
yet; will measure on next v* tag push]
NOTE: this commit does NOT retag — keigit publish 401 issue is on the
keigit-server side (verified: token works locally, 401 from runner IP)
and requires user-side action (fail2ban/Caddy whitelist GitHub Actions
IP ranges on 45.77.41.204). After user fixes that, next tag will
verify both speed gain AND publish success.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
