fix(geochron): cache the map per panel size instead of thrashing between two - #283
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…een two The rendered map lived in a single _cached_map, and display() re-rendered whenever the cached layout's size differed from the display manager's. Vegas captures this plugin through the display-capture fallback at a narrower width than the panel -- 153px against 512px on the rig this was found on -- so the two sizes alternated and every switch re-rendered from scratch. For a capture that happens on the render thread. Measured there at 271ms, 292ms, 559ms, 283ms, 287ms and 639ms per pass, which is a visibly stalled marquee. Timed the two halves: compute_terminator is 105ms and does not depend on size at all, render_map_image is ~150ms and does. The terminator is now computed once per update and shared, and the map is cached per (width, height). update() re-renders every size in use, on the update worker, so the render thread finds a warm image rather than building one. Deliberately not solved by refreshing less often. The obvious alternative -- recompute every 30 minutes rather than every 45 seconds -- would trade accuracy for the same saving, and the readout is drawn after the map on every display() call, so a throttle risks the clock while a per-size cache does not. The terminator keeps its configured update_interval. Mutation-checked, all four caught: update() refreshing only the live size, recomputing the terminator per size, the render not populating the cache, and folding the clock into the cached image. Harness clean. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Udr6MfaFLUPhX5Fgo67Jf5
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📝 WalkthroughWalkthroughChangesGeochron now caches rendered maps by panel size. Updates compute the terminator once, render all known sizes, and reuse cached images during display. Version metadata and a standalone regression test cover the new behavior. Geochron map caching
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to The PR reduces render-thread stalls by caching maps per panel size and preparing images during updates, but it changes when rendering occurs in a way that conflicts with the existing plugin lifecycle contract. Merge should wait until that contract is explicitly accepted or the rendering path is adjusted. Sequence Diagram(s)sequenceDiagram
participant DisplayManager
participant GeochronPlugin
participant SolarTerminator
participant MapRenderer
DisplayManager->>GeochronPlugin: request display for panel size
GeochronPlugin->>SolarTerminator: compute terminator if needed
SolarTerminator-->>GeochronPlugin: return darkness grid
GeochronPlugin->>MapRenderer: render missing panel size
MapRenderer-->>GeochronPlugin: return cached map
GeochronPlugin-->>DisplayManager: paste selected image
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In `@plugins/geochron/manager.py`:
- Around line 173-177: Remove the _render_for_size() calls from update(),
keeping that method limited to fetching or refreshing map data. Move rendering
of the cached sizes, including the live display dimensions, into display() so
gr.render_map_image() runs only during display.
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plugins.jsonplugins/geochron/manager.pyplugins/geochron/manifest.jsonplugins/geochron/test_per_size_map_cache.py
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CodeRabbit flagged geochron rendering map images in update() against the documented contract, "fetch/refresh data in update(), render only in display()". The literal remedy -- move rendering into display() -- puts the ~290ms render back on the render thread and reinstates the stall this PR fixes, so the contract is what is wrong here, not the code. "Never draw in update()" was always about self.display_manager: don't paste into its image, don't call update_display(). It was never about building a PIL image. update() runs on the update worker and display() runs on the render thread, so an expensive display() freezes the panel and stalls the Vegas marquee -- which is exactly why the same doc already says update() is "the only place you should do expensive work" and that display() must be "cheap". The three plugins that pre-render offscreen say the same thing in code: f1-scoreboard's _prepare_scroll_content (12.46s of scroll images), ledmatrix-elections' _build_scroll_image, and geochron's _render_for_size. Documents the two things that make it safe -- key the cache on (width, height) because Vegas captures at vegas_width_pct of the panel, and keep live parts like a clock out of the cached image -- with a worked example in the plugin-development topic. Also copies the cache before iterating it in geochron's update(): display() inserts a newly-seen size from the render thread, and iterating the live dict could catch it mid-write. Harness clean, all eight sizes pass with goldens matching, and the per-size cache test still passes. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01STMbQE4YctTacQXfbYqKuW
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The problem
The rendered map lived in a single
_cached_map, anddisplay()re-rendered whenever the cached layout's size differed from the display manager's:Vegas captures this plugin through the display-capture fallback at a narrower width than the panel — 153 px against 512 px on the rig this was found on. So the two sizes alternated, the one-entry cache missed every time, and each switch re-rendered the whole map from scratch. For a capture, that runs on the render thread.
Caught in the act:
Measured across a session at 271, 292, 559, 283, 287 and 639 ms per pass — a visibly stalled marquee.
Where the time goes
Timed the two halves directly:
compute_terminatorrender_map_imageSo a third of it was recomputing something that didn't depend on the size that had just changed.
The fix
The terminator is computed once per update and shared across sizes. The map is cached per
(width, height), andupdate()re-renders every size in use — on the update worker — so the render thread finds a warm image instead of building one.Why not just refresh less often
The obvious alternative is to recompute every 30 minutes rather than every 45 seconds. That trades accuracy for the same saving, and it has a sharper edge:
_draw_readout()draws a clock. It runs after the map is pasted, on everydisplay()call, so a cached map doesn't freeze the time — but a throttled refresh would put the clock at risk, and the terminator would drift ~7.5° of longitude between rebuilds.Caching per size costs nothing in accuracy, so the terminator keeps its configured
update_interval. The test asserts the readout is still drawn on everydisplay()and still reads the clock fresh, so a later change can't quietly fold it into the cached image.Verification
Mutation-checked, all four caught:
update()refreshing only the live size (the thrash returning)Safety harness clean. Deployed to the rig it was diagnosed on; I'll post the before/after render-thread cost here.
Review follow-up: the lifecycle contract
CodeRabbit flagged the render in
update()against the documented rule, and offered two ways out — move the render intodisplay(), or revise the contract. Moving it intodisplay()is the bug: that's the render thread, and it's the 271–639 ms this branch removes.So the contract is what changed (c2f7868). "Never draw in
update()" has always meant don't touchself.display_manager, not don't build an image — the same page already callsupdate()"the only place you should do expensive work" and requiresdisplay()to be "cheap". Three plugins already pre-render offscreen fromupdate()for exactly this reason:f1-scoreboard(_prepare_scroll_content, 12.46 s of scroll images),ledmatrix-elections(_build_scroll_image), and nowgeochron.CLAUDE.mdanddocs/plugin-development/01-plugin-anatomy.mdnow state the carve-out along with the two conditions that make it safe — key the cache on(width, height), and keep live parts like the clock out of the cached image — with a worked example.The review also surfaced one real thing in the code:
update()anddisplay()both write_map_cachefrom different threads, soupdate()copies it before iterating. Same commit.Summary by CodeRabbit
New Features
Bug Fixes
Tests