# The P0 benchmark fixture

`transcript.jsonl` is a synthetic transcript in the app's own event model (the JSON lines
`GET /sessions/{id}/transcript` returns; see `Events.kt`'s `parseSeqEvent` and
`server/src/session/driver.rs`) -- never a real one. It is what both the Compose `bench` build
and iris's bench build open with no server, so the two apps draw exactly the same content and a
frame-time comparison is measuring the renderer rather than the data.

Generated by `./generate.py` (Python stdlib only, seeded -- `SEED = 20260905` -- so re-running it
reproduces the same file byte for byte). It writes into `assets/` -- a separate directory from this
script and README, because the Compose `bench` build type points its own asset source set straight
at `assets/` (`app/androidApp/build.gradle.kts`'s `sourceSets { getByName("bench") }`), and a Python
script and a markdown file have no business inside an APK:

- `transcript.jsonl` -- 3,601 events. The first 3,200 (`BACKLOG_COUNT`) are the scrolled-back
  history the benchmark opens with: user turns, tool calls with kilobyte-scale input/output,
  assistant replies built from headings, bold/italic/inline code, a link, fenced code blocks that
  rotate through rust/kotlin/python/sh/json/toml, a markdown table, two embedded images, and
  periodic `usageDelta`/`compacted` events. The remaining 400 (`STREAM_COUNT`) are not part of the
  opening window -- both bench harnesses replay them at a fixed rate (20/s) through the same live
  fold path a real SSE reply arrives on, which is P0's "streaming phase."
- `bench1.png`, `bench2.png` -- tiny (8x8) flat-colour PNGs, base64-free on disk but served the
  same way a real attachment is (`GET /sessions/{id}/files/{name}`), referenced by the two
  `"type":"image"` events in the transcript.

Regenerate after changing the shape (a new event type, a different backlog/stream split) with
`./generate.py`, and commit the result -- it is checked in rather than generated at build time so
both apps' bench builds embed the identical bytes without needing this script at build time.