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Scope resolution calls `loadParsedFilesForPaths` once per language, and every call walks every shard in the store. The skip decision needs the envelope's path listing, and that listing is only trustworthy after the payload digest has been checked -- so a pass that wants 50 Python files still opens and SHA-256s all 413 shards / 301MB of a TypeScript-dominated store to prove it can skip them. A pass wanting a SINGLE file costs 335ms. The cost scales with language count, not with the files that language has, so a polyglot repo pays it worst. `tryLoadV8Cache` now returns the listing it already parsed for that skip decision, and the store memoizes it per run. Later passes skip on the memoized listing without reopening the file. Measured on a 2234-file, 3-language repo, min-of-5: before python 411ms typescript 2872ms javascript 507ms = 3834ms after python 415ms typescript 2805ms javascript 248ms = 3484ms -350ms here, roughly -250ms per additional language elsewhere. The first pass is unchanged by construction -- it is what populates the memo. End-to-end the graph is byte-identical: 51,288 nodes / 163,094 edges / 2106 clusters / 759 flows on a true incremental run. Keyed on size+mtime as well as name. Shard names are content-addressed, so a name collision across different content should be impossible, but that invariant lives in the parse-cache keying rather than here and one stat per shard is a few ms against the hundreds this saves. The memo holds one store directory at a time, so a new repo in a long-lived MCP process drops the previous set instead of accumulating. The failure mode a listing memo introduces is a FALSE SKIP: a pass concludes a shard holds nothing it wants and those files silently never reach the graph -- an exit-0 wrong answer, not a crash. The new test walks four passes with disjoint wants over one store, plus a shard written after the memo is warm; it fails when the skip is forced. Also records the full scopeResolution breakdown in bench/. The headline is that `emit` is 7161ms of the 14.7s phase and ~21% of the edit loop, spread across a fan of passes with no hot inner loop -- so the win there is not running them for unchanged files, which is a design rather than a patch. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> |
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