typewriter

julien/typewriter

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Author	SHA1	Message	Date
Julien Calixte	9309f3f239	docs(sync): record the esp_map v2 verdict and cache removal Run 4: memory discipline verified (1833 KB flat, no OOM) but 0 hits with the small maps demonstrably retained — window-repetition theory refuted, sub-second bar failed (splice 2.83 s cold / ~2 s steady). Decision: wire the splice in anyway (~9-10 s cold real-repo :sync vs 611 s/OOM for every alternative). Run 5: cache removal confirmed free; the ~1.85 MB "resident" was mwindow's live window set, which makes the mwindow opts in shipping git_sync.rs load-bearing.	2026-07-13 00:20:12 +02:00
Julien Calixte	ce3204a350	docs(sync): record fast-seek root cause and splice bench trail Splice bench (6.5 s, O(depth) shape confirmed), FatFS cluster-chain root cause with elm-chan/ESP-IDF references, on-device fast-seek verification, second localization round (strict-creation refuted, read_header 470 ms), esp_map v2 design, and the two firmware plumbing gaps (mwindow opts + 16-FD mount).	2026-07-13 00:02:55 +02:00
Julien Calixte	dade5e6bb3	docs(sync): record real-repo commit bench and TreeBuilder handoff The real jcalixte/notes clone (570 MB pack, 1179 files) proved both index strategies are O(N_tree) and unshippable: index.write re-hashes the tree (611 s), and the index-free read_tree is 77 s cold and OOMs the mmap cache (zlib crash). Record the run in the tradeoff curve, revise the verdict to an O(depth) TreeBuilder walk, and add a handoff note with the design, firmware call sites, and bench steps for the next session.	2026-07-12 15:04:59 +02:00

Author

SHA1

Message

Date

Julien Calixte

9309f3f239

docs(sync): record the esp_map v2 verdict and cache removal

Run 4: memory discipline verified (1833 KB flat, no OOM) but 0 hits
with the small maps demonstrably retained — window-repetition theory
refuted, sub-second bar failed (splice 2.83 s cold / ~2 s steady).
Decision: wire the splice in anyway (~9-10 s cold real-repo :sync vs
611 s/OOM for every alternative). Run 5: cache removal confirmed
free; the ~1.85 MB "resident" was mwindow's live window set, which
makes the mwindow opts in shipping git_sync.rs load-bearing.

2026-07-13 00:20:12 +02:00

Julien Calixte

ce3204a350

docs(sync): record fast-seek root cause and splice bench trail

Splice bench (6.5 s, O(depth) shape confirmed), FatFS cluster-chain
root cause with elm-chan/ESP-IDF references, on-device fast-seek
verification, second localization round (strict-creation refuted,
read_header 470 ms), esp_map v2 design, and the two firmware plumbing
gaps (mwindow opts + 16-FD mount).

2026-07-13 00:02:55 +02:00

Julien Calixte

dade5e6bb3

docs(sync): record real-repo commit bench and TreeBuilder handoff

The real jcalixte/notes clone (570 MB pack, 1179 files) proved both index
strategies are O(N_tree) and unshippable: index.write re-hashes the tree
(611 s), and the index-free read_tree is 77 s cold and OOMs the mmap cache
(zlib crash). Record the run in the tradeoff curve, revise the verdict to an
O(depth) TreeBuilder walk, and add a handoff note with the design, firmware
call sites, and bench steps for the next session.

2026-07-12 15:04:59 +02:00

3 Commits