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perf(decofile): decompress .bin with node:zlib instead of npm:brotli - #1242
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npm:brotli's index loads its emscripten encoder too, which reserves TOTAL_MEMORY (304 MiB) at module load. fs.ts is imported statically, so every pod paid it even though only decompress is used: ~312 MiB of external memory (~33 MiB resident on Linux). node:zlib's brotliDecompressSync is native and needs no npm package.
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe filesystem decofile provider now uses Node.js Brotli decompression for ChangesDecoFile filesystem provider
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Refactor Suggested reviewers: Merge Risk: ⚪ Minimal · up to The Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 1 system. Changed systems: Architecture concerns Review detailsSystems and components
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The fs provider had no dispose, so its Deno.watchFs handle leaked and the test had to turn off the resource/op sanitizers. Close the watcher (and drop any pending debounced read) on dispose, and re-enable the sanitizers.
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Actionable comments posted: 1
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Inline comments:
Review comments at @engine/decofile/fs.ts:
- Around line 175-177: Update doUpdateState to check disposed immediately after
the awaited file read, returning before replacing decofile or invoking onChange
callbacks if disposal occurred while the read was in flight.
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engine/decofile/fs.test.tsengine/decofile/fs.ts
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Why
engine/decofile/fs.tsimports{ decompress } from "npm:[email protected]"to read the production decofile (/app/decofile/decofile.bin). That package'sindex.jsalso doesrequire('./compress'), which loadsbuild/encode.js. That's an Emscripten build that allocatesTOTAL_MEMORY = 318767104bytes (304 MiB) when the module loads.fs.tsis imported statically (engine/manifest/manifest.ts), so every pod of every site pays this, even though onlydecompressis ever called.Measured on Linux (
denoland/deno:2.5.6), in a script that only imports the package:Deno.memoryUsage().externalnpm:brotlinode:zlibSo it costs ~33 MiB of real memory per pod, plus a 312 MiB "external" reading that makes memory dashboards and V8's external-memory accounting misleading. In a heap snapshot of a production-mode farmrio instance, that single
Int16Arraywas 324 of 579 MiB.What
Use
brotliDecompressSyncfromnode:zlib, Deno's native Rust brotli. No npm package, no WASM/asm.js heap.Tests
engine/decofile/fs.test.ts: writes a brotli + base64decofile.bin(the production format) and reads it back throughnewFsProviderFromPath.externalwent from 309 MiB to 4 MiB with no functional change.Summary by cubic
Swaps the decofile decompressor from
npm:brotlitonode:zlib, cutting per-pod memory usage. The old package loaded its Emscripten encoder at import time, reserving a 304 MiB heap in every pod even though onlydecompresswas used; measured RSS dropped from 89 MiB to 56 MiB and external memory from 312 MiB to 3 MiB.decompressfromnpm:[email protected]withbrotliDecompressSyncfromnode:zlibinengine/decofile/fs.ts.engine/decofile/fs.test.tscovering the production brotli + base64.binformat.disposeon the fs provider to close itsDeno.watchFswatcher and clear pending debounced reads, fixing a handle leak.watchFsfailure can't reject the decofile promise, and skips state updates afterdispose.Written for commit dbd25e0. Summary will update on new commits.
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