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Jeremy Rose
b389b950e1
## Summary Turn diff updates repeatedly rendered and serialized the entire accumulated diff after every `apply_patch`. The event path also rendered once before updating the tracker solely to test whether a diff existed. In production feedback CODEX-20PW, 2,589 patches across 72 paths produced 401 notifications totaling 441 MB, with the hottest paths patched 518 and 495 times. This change: - replaces the pre-update render with a cheap cached-state check - caches each rendered file diff by path and content revision, so an update only invokes Myers for affected paths - caches the deterministic aggregate diff so event emission and turn completion reuse it without recomputation - preserves invalidation and net-zero clear notifications - applies a 100 ms per-file `similar` timeout; ordinary files complete far below this threshold, while pathological rewrites fall back to a coarse unified hunk that still represents the exact final contents The 100 ms deadline bounds synchronous tool-completion latency while leaving substantial headroom for normal diffs. The regression test applies the fallback diff through the repository's patch parser and verifies byte-for-byte final contents. ## Validation - `cargo test -p codex-core turn_diff_tracker::tests` (14 passed) - `cargo test -p codex-core tools::events::tests` (4 passed) - `just fix -p codex-core` - `just fmt` Focused coverage verifies that 42 updates across two files perform 42 file renders rather than repeatedly rendering the accumulated set, unchanged paths are not re-diffed, clear events remain correct, and a 48,000-line near-total rewrite returns promptly and applies to the exact expected result. The full `codex-core` suite was not used as the final gate because an unrelated existing multi-agent test hit a stack overflow when run during investigation. ## Bug context - Sentry feedback: CODEX-20PW - Correlation IDs: `019eb2a9-13d2-74e0-b690-27ee224ffb6d`, `019e9ad7-09c3-7cb2-b728-ee3acba103ab`
b389b950e1
·
2026-06-10 17:17:44 -07:00
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