Overview
| Comment: | Create new branch named "zerocache" |
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| Timelines: | family | ancestors | descendants | both | zerocache |
| Files: | files | file ages | folders |
| SHA3-256: |
6542332151954daa0ea88f8f32258bac |
| User & Date: | dmestas on 2026-07-17 00:54:34.152 |
| Other Links: | branch diff | manifest | tags |
Context
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2026-07-17
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| 01:54 | Serve warm reads from a materialized column image instead of re-deriving RepoState, cutting a warm leaves load 178.6us to 2.12us (84x). At cache write, dense integer-addressed columns for the mtime index, leaf image, and symbolic-name table are appended to the versioned .zit-cache; on a fast_read open the freed queries (mtimeOf/isLeaf/isOpenLeaf/leaves/branchOf/resolveName per repostate 7.1/7.4/7.5/8.2) answer from those columns with zero derivation. Load-time span validation range-checks every column, CSR span, and stored id and returns a miss (fall back to derive) on any violation or CRC/layout/log-tail mismatch, so a corrupt or stale image is never a wrong answer. RepoState's public API is unchanged; only leaves opts in, cold verbs keep the derive path. Technique: on-disk zero-parse caching after Richard Feldman's Roc and Andrew Kelley's Zig compiler (common in game engines per Casey Muratori); typed enum(u32) index families after the compact_arena crate. closed check-in: ae242f5563 user: dmestas tags: zerocache | |
| 00:54 | Create new branch named "zerocache" check-in: 6542332151 user: dmestas tags: zerocache | |
| 00:38 | Merge warmprobe: land the warm-read timing bench that gates read-path perf work on measured re-derivation share (98% of warm load on althttpd). check-in: 8ccef5b6bd user: dmestas tags: trunk | |
Changes