Gate evidence (docs/design/rust-kernel-migration-plan.md §4b):
- Graph parity, byte-identical (stronger than the §5 ≤0.5% bar): full
codegraph-init dump-diffs kernel-vs-wasm on express (13,712 rows),
excalidraw (89,898), and vscode (2,378,238 rows) — identical bytes.
Python control repo (flask) identical + timing unchanged. The parity
harness is now ORDER-sensitive (emission order drives rowids, which
drive resolution order) and dumps come from the new
scripts/dump-graph.mjs (natural keys, no rowids/timestamps).
- The one real find, caught by the vscode tier: tree-sitter error
RECOVERY is encoding-dependent — byte-identical grammar sources and
the same core (0.25.10) recover erroring files differently under
UTF-8 (native) vs UTF-16 (web-tree-sitter) parsing; proven by
reproducing the wasm tree with a native UTF-16 parse. Policy: the
kernel defers any file whose tree has_error() to the wasm extractor
(silent 'defer:' signal, per file) — parity by construction on
erroring files (incidence 0-0.42% across the gate repos), and the
harness fails if deferrals exceed 10% so a broken kernel can't hide
behind the fallback.
- Retrieval invariants: canonical excalidraw flow (mutateElement →
renderStaticScene) connects end-to-end on the kernel-indexed graph;
synthesized-edge families present. Agent A/B is vacuous under
byte-identical DBs (same justification as #1320-#1322).
- Perf: vscode init 105.4s → 82.1s (1.28×) on an 11-core Mac;
excalidraw on a 2-CPU/6GB Linux container (the CI-runner envelope)
6.2-7.1s → 4.3-4.8s (~1.5×). Linux arm64 in-container build: all 22
kernel tests green under CODEGRAPH_KERNEL_EXPECT=1. Windows VM leg
deferred (VM stopped; prlctl start needs Parallels Pro) — benign: a
missing .node falls back to wasm, and the release matrix builds and
gates the win32 prebuilds.
- Full suite: 2,465 tests pass WITH default-on routing, so the entire
extraction corpus now exercises the kernel for TS/JS wherever a
.node is staged.
DEFAULT_ROUTED = {typescript, tsx, javascript, jsx}. Override:
CODEGRAPH_KERNEL_LANGS (replaces the set) / CODEGRAPH_KERNEL=0 (kill).
Changelog entry added under [Unreleased].
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Parse timeouts are now judged by the worker's own clock: the base timer
only marks a job late (after a long synchronous store stall, Node runs the
timers phase before the poll phase, so the timer fired before an
already-delivered result was processed — killing workers over parses that
took milliseconds, even on 0-byte files); a result arriving before a 3×
hard-kill backstop is accepted, timed-out files are retried, and
CODEGRAPH_PARSE_TIMEOUT_MS overrides the budget. Grammar WASM bytes are
pre-read once on the main thread and handed to every worker, so
spawns/respawns load grammars from memory instead of re-reading a
saturated disk.
Bulk indexing defers WAL auto-checkpointing for the whole run: the default
1000-page interval re-writes hot B-tree/FTS pages into the main DB file
over and over — ~95% of all disk I/O under throttled measurement. A
WalCheckpointValve bounds WAL growth with off-thread PASSIVE backfill
passes (never blocking the writer or the #850 watchdog heartbeat), pauses
the writer for a full backfill if the disk truly can't keep up, and folds
the WAL at the parse→resolution boundary so post-parse reads never page a
bulk-write-sized WAL. Opt out with CODEGRAPH_NO_WAL_DEFER=1; tune with
CODEGRAPH_WAL_VALVE_MB.
Measured at 150 IOPS (HDD class): commons-lang 1526s → 59s with 0 dropped
files (was 8); guava-scale completes in 7.6 min with a full graph where
v1.3.1 needed 25 min for a repo 5× smaller. Unthrottled: no change.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Colby McHenryandClaude Fable 5
