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test(perf): count update cycles, model builds and adoptions during boot (#520)

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The full comparison says model readiness grew by ~500 ms inside #500 and
that the growth sits in one long task, but neither contentFingerprint
(2.8 ms on this fixture) nor spaceModels (0.1 ms) can account for it. The
benchmark now prints, per sample, how many Lit update cycles ran before the
first stable frame, how long they took together, how many models were built,
how many adoptions happened and the config epoch. Diagnostics only: printed
to the log, never part of the budgeted record, and the same harness runs
against the comparison bundle, so candidate and base are counted alike.

Issue: #520
User-Visible: no
This commit is contained in:
Claude
2026-09-10 17:38:36 +03:00
parent 914e84028d
commit 37ef970dfc
2 changed files with 25 additions and 0 deletions
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demo/benchmark_large_house.mjs
+24
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@@ -294,6 +294,26 @@ try {
} else history.replaceState(null, '', location.pathname);
const host = document.getElementById('host');
const card = document.createElement('houseplan-card');
// #520 diagnostics: where the extra half second of model readiness goes.
// Counts Lit update cycles and model builds; printed, never budgeted.
card.__diag = { updates: 0, updateMs: 0, models: 0, adopts: 0 };
const diagPerform = card.performUpdate.bind(card);
card.performUpdate = function () {
const started = performance.now();
const result = diagPerform();
card.__diag.updates += 1;
card.__diag.updateMs += performance.now() - started;
return result;
};
const diagBuild = card._buildModel.bind(card);
card._buildModel = function () { card.__diag.models += 1; return diagBuild(); };
if (typeof card._adoptStructuralResponses === 'function') {
const legacy = card._adoptStructuralResponses.bind(card);
card._adoptStructuralResponses = function (...args) { card.__diag.adopts += 1; return legacy(...args); };
} else if (typeof card._adoptAuthoritative === 'function') {
const gated = card._adoptAuthoritative.bind(card);
card._adoptAuthoritative = function (...args) { card.__diag.adopts += 1; return gated(...args); };
}
card.setConfig({
type: 'custom:houseplan-card', title: `Performance baseline ${sample}`, icon_size: 3.4,
});
@@ -363,6 +383,10 @@ try {
if (interaction && '_bootSoft' in card) await until(() => card._bootSoft === false);
await frame();
const firstStableRenderMs = Number((performance.now() - loadStarted).toFixed(2));
console.log(`#520 diag sample ${sample}: updates=${card.__diag.updates}`
+ ` updateMs=${card.__diag.updateMs.toFixed(1)} models=${card.__diag.models}`
+ ` adopts=${card.__diag.adopts} cfgEpoch=${card._cfgEpoch}`
+ ` modelReady=${modelReadyMs} firstStable=${firstStableRenderMs}`);
const initialProjection = typeof card._effectiveProjection === 'function'
? card._effectiveProjection() : null;
if (requiresIsometric && initialProjection !== 'iso')
node_modules
Symlink
+1
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@@ -0,0 +1 @@
/tmp/rel/node_modules