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perf(display): skip preview work nobody reads (lazy checksum, 1 Hz snapshot writer) (#717)

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Mid-scroll, update_display() no longer checksums every frame: it asks is_currently_scrolling() once per frame and reuses the answer, hashes only when dirty tracking can skip a static frame, and the preview snapshot asks its policy first and hashes only when a write or touch could follow (decide() is monotone, pinned by a property test). With the preview open the snapshot is written at most once a second (VIEWER_INTERVAL 1.0 s, was 0.2 s; the SSE stream re-read it once a second, so four encodes in five went unread); the stream now polls its mtime every 0.25 s (VIEWER_POLL_INTERVAL), so the preview stays about as fresh. The PNG is written at compress_level=1. --preview soaks are not comparable across this change.

Merged with #716: _scan_segments takes the frame's one scrolling answer and #716's static-handover pass-through, as soaked on ledpi (A B B A, 20 min each: main 0.118% / 0.113% late, with #716 and this 0.107% / 0.104%).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Chuck
2026-10-01 20:27:20 -04:00
committed by GitHub
co-authored by Claude Opus 5.5
parent 1ecf3aba03
commit f72d69c2b0
13 changed files with 804 additions and 47 deletions
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@@ -51,8 +51,8 @@ each other. They share three things:
| Fetch statistics (requests per plugin and host) | cache `fetch_stats_snapshot` | display: `FetchStatsPublisher` ([`src/common/fetch_service.py`](../src/common/fetch_service.py)), at most once a minute on change | web: `read_fetch_stats()` for `/api/v3/plugins/fetch-stats` |
| Plugin health | cache `plugin_health:<id>` | display (web writes on reset) | web: `/api/v3/plugins/health` |
| Plugin runtime (loaded, state, last error, version) | cache `plugin_runtime_snapshot` | display: `PluginRuntimePublisher` ([`src/plugin_system/plugin_runtime.py`](../src/plugin_system/plugin_runtime.py)) | web: `read_plugin_runtime()` for `/api/v3/plugins/installed`, `/plugins/state`, reconciliation |
| Preview frame | `/tmp/led_matrix_preview.png` | display: `DisplayManager`, gated by [`snapshot_policy`](../src/common/snapshot_policy.py) | web: display SSE stream, `/api/v3/health` (file age) |
| Preview viewer marker | `/tmp/led_matrix_preview_viewer` | web, while a preview is open | display: writes full-rate snapshots only while it is fresh |
| Preview frame | `/tmp/led_matrix_preview.png` | display: `DisplayManager`, gated by [`snapshot_policy`](../src/common/snapshot_policy.py): a changed frame at most once a second with a viewer, every 30 s without | web: display SSE stream (checks the mtime every 0.25 s), `/api/v3/health` (file age) |
| Preview viewer marker | `/tmp/led_matrix_preview_viewer` | web, about once a second while a preview is open | display: writes viewer-rate snapshots only while it is fresh (5 s) |
| Hardware init status | `/tmp/led_matrix_hw_status.json` | display | web: `/api/v3/hardware/status` |
| Render-loop heartbeat | `/run/ledmatrix/display-heartbeat.json` (tmpfs) | display: the render thread, via [`display_watchdog`](../src/display_watchdog.py) | web: `/api/v3/health` (`checks.display_loop`); the update health check |