OXYGENHUB

Backlog 3: the full vscode import, and what it needs next 2517abe64654

refs #35
Author
Andy McCall @andymccall <[email protected]>
When
· 2026-09-30 03:43 UTC
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✔ signed by Andy McCall
Hash
2517abe64654dbbf11a0ea52b9ca2d53cbc000c398326655704b0d70d0aae84a
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1681323d1dff 33e77a5526fa 36695c5e02ef
Depended on by
f6451fbbae3f
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  - **Format 3**: text blobs hold the lines' bytes, with no CBOR framing (1122dcb3). The runner (oxygenflow#16) and hub (oxygenhub#59) were deployed with the new reader first.
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  - **Linux tip**: the store is 324 MB after gc (objects 306 MB; Git 311 MB). The first commit takes 32.6 s (Git 33.7 to 37.9 s), measured while Earth ran at load average 11 during the vscode import.
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  - **H2**: the vscode import (H4) runs on Earth as a service.
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- 2026-09-30 **H4 attempted**: the full vscode import (166 425 commits) under a 14 GB cap. With changes added mixed (e15074c7), it still grew about 0.4 MB per commit: 4.3 GB after 35 minutes and roughly 9 000 commits, far past the cap long before the end. It was stopped. The growth is the importer's kept states: each is a deep clone of a history-only state (change metadata, tree maps, the deferred edits of every file), up to eight at a time, with a new clone at every branch point.
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  - **Next (H2b)**: make a state cheap to clone by sharing its parts (per-file deferred entries and graphs behind `Arc`, copied on write; the change map and tree likewise), so kept states share what they have in common.
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  - **Also**: an import should report progress on long runs.
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