dtourolleandClaude Opus 5
2c84aa1224
The face store was the one part of the catalog still on SQLite's default rollback journal at `synchronous = FULL`. The catalog itself runs WAL at `NORMAL` (`schema::configure`) and so does the thumbnail store; nothing decided this one should differ, it was simply never set. Measured on this project's own filesystem, that is **21.3 ms per commit against 0.05 ms** — four hundred times. And an export commits four times per photograph: the shard's transaction, then three separate autocommitting writes to the index. Ten thousand images is on the order of fourteen minutes spent doing nothing but waiting for fsync, before a byte goes to the server. That is the "checking faces…" that appeared to hang. So: WAL and `synchronous = NORMAL`, matching the rest, and the three index writes fold into one transaction. `NORMAL` is the same trade the catalog makes — a shard is derived data, and losing the last commit to a power cut costs one image re-exported. WAL brings an obligation with it, because **a shard is uploaded by reading its file**: the newest commits live in a `-wal` sidecar that no upload sends, so without a checkpoint the server would receive a database missing exactly the faces just written, and a peer would adopt it and see nothing wrong. `checkpoint` folds the logs back in, with `TRUNCATE` rather than the default passive mode, which gives up when a reader holds the log and would leave the same gap while reporting success. Two tests: that the store is in WAL like everything else, and — the one that matters — that a checkpointed shard copied *without* its `-wal` still holds every face. That second one fails without the checkpoint, which is how it was confirmed to be testing something. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
DarkRoom
A cross-platform, non-destructive RAW photo editor for Linux and Android.
Status: early. v0.1 is a remote library viewer — see docs/milestone-v0.1.md.
Documentation
| Document | Contents |
|---|---|
| requirements.md | What the software must do — 122 numbered requirements |
| architecture.md | How it is built — crates, GPU pipeline, data model, sync |
| milestone-v0.1.md | The first buildable milestone |
| faces.md | Face detection and identity — the models, the licence problem, and what S14 measures |
Building
Desktop:
cargo run -p darkroom-desktop
Android (containerised toolchain, see docker/android):
./docker/android/build.sh cargo ndk -t arm64-v8a build --release
Current state
Working: workspace, GPU context and compute pass, adaptive Slint shell, Android cross-compilation of the core crates.
Not yet working: the zero-copy display path. The build currently uploads frames through the CPU, which is exactly what ARCH §6.1 forbids — measured at 96% of frame time at 4K. Replacing it is spike S1, the project's highest priority.
cargo run -p dr-gpu --example bench --features readback
reproduces that measurement.
Licence
GPL-3.0-or-later.