mirror of
https://github.com/pchuan98/codex.git
synced 2026-07-01 00:31:56 +08:00
Adam Perry @ OpenAI
f97d5c3275
## Why Fat LTO makes release builds substantially slower without providing enough measured runtime benefit to justify the release CI long pole. The build-profile investigation found that keeping Cargo's default release `opt-level=3` and switching from fat LTO to ThinLTO (`3/thin/1`) reduced a clean `codex-cli` release build from 2073.893 seconds to 1243.172 seconds, a 40.06% improvement. The resulting binary increased from 196.7 MiB to 211.8 MiB (+7.63%). Measured runtime changes were small: the worst image workload median was +0.86% and app-server startup was +0.31% relative to fat LTO. ThinLTO retains cross-crate optimization while avoiding most of the fat-LTO build cost. This deliberately avoids global size optimization: final-executable testing showed a substantial regression on the image request path, which is expected to become more important as image usage grows. ## What changed - Set the workspace release profile to `lto = "thin"`, retaining Cargo's default release `opt-level=3`. - Remove release and CI workflow-specific LTO overrides so release-profile builds consistently use the workspace setting. - Remove the now-unused Windows release workflow input and related diagnostic output. ## Validation - Confirmed the release profile parses with `cargo metadata --no-deps --format-version 1`. - CI validates release builds across the supported target matrix.
f97d5c3275
ยท
2026-06-04 20:07:53 +00:00
History
