# Kobo Deluxe DOD Refactor — Benchmark Scoreboard

Each row is one phase of the refactor (see
`~/.claude/plans/can-you-explain-the-noble-wilkes.md`). Numbers are median
ns/frame from `KOBO_PROF=1 KOBO_STRESS=1500 ./build/kobodl`, ~1000 frames,
release build (`-O2 -g`).

## How to capture a baseline

```sh
cd build
cmake --build . -j
KOBO_PROF=1 KOBO_STRESS=1500 ./kobodl
# play through a stage; profile dumps every 600 frames to stderr.
# Redirect stderr to a file if you want to keep it:
KOBO_PROF=1 KOBO_STRESS=1500 ./kobodl 2>prof.log
```

The profiler dumps a table per zone with `calls`, `total_ms`, `ns/call`.
Record the `ns/call` for these zones (they are the moving parts the refactor
targets):

| Zone                  | What it measures                                    |
|-----------------------|-----------------------------------------------------|
| `run_game`            | Full game tick                                      |
| `myship.move`         | Player + bolt update                                |
| `enemies.move`        | Realize pass + move pass combined                   |
| `enemies.realize`     | Just the realize-reserved pass                      |
| `enemies.move_pass`   | Just the per-enemy move pass (the hot loop)         |
| `hit_structure`       | Player vs map + bolt vs map                         |
| `hit_bolt`            | Bolt-vs-enemy scan (called from inside enemy move)  |

## Scoreboard

| Phase                        | run_game | myship.move | enemies.move_pass | hit_bolt | Notes |
|------------------------------|---------:|------------:|------------------:|---------:|-------|
| 0 — baseline                 |        ? |           ? |                 ? |        ? | TBD — user to capture |
| 1 — hot/cold split           |          |             |                   |          |       |
| 2 — SoA pool                 |          |             |                   |          |       |
| 3 — bucket dispatch          |          |             |                   |          |       |
| 4 — flipped bolt collision   |          |             |                   |          |       |
| 5 — render decouple          |          |             |                   |          |       |
| 6 — SIMD integrator (opt.)   |          |             |                   |          |       |

## Notes

- `KOBO_STRESS=N` keeps the pool topped up with rocks; N=1500 sits well
  below ENEMY_MAX=2048 so the spawner doesn't thrash on full-pool checks.
- The stress spawner uses `pubrand`, which is acceptable for benchmarking
  but will *not* produce identical demos across builds — that's fine, we
  only care about steady-state cost.
- For a stable run, start the game, get into a stage, then let it sit for
  ~1000 frames before reading numbers. The first dump (frame 600) will
  include startup costs and should be discarded.