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Theseus boot tracer: measure a working launch, and say when it did not

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With a script as the Electron entry, the app path is the script's folder;
main.js loads chrome.html, home.html and every overlay by relative name, so
all of them failed with ERR_FILE_NOT_FOUND and every traced run measured a
broken launch (it also left a window showing the error page). The tracer now
sets app.setAppPath to TheseusNavigator, records failed main-frame loads, and
run.mjs marks such a run INVALID.

Re-measured (warm runs, fresh profile): the per-overlay lazy loading in
e524c12 saves 5 processes and ~100 MB private memory at 15 s — not ~30 MB
with an unchanged process count as its message says; that figure came from
the broken runs. The BNS indexer utilityProcess costs ~60-75 MB.
This commit is contained in:
Local Dev 2026-10-03 14:14:46 +02:00
parent a57d20751b
commit b531c89f82
2 changed files with 10 additions and 2 deletions
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6
scripts/boot-trace/run.mjs
View file

@ -60,6 +60,7 @@ function summarise(file) {
fetches6s: ev.filter((e) => e.kind === "fetch" && e.start < 6000).length,
proc15: metric("15s").processes ?? null,
mem15: metric("15s").privateMB ?? null,
failed: ev.filter((e) => e.kind === "fail").map((e) => e.label),
};
}
@ -68,9 +69,10 @@ for (let i = 1; i <= RUNS; i++) {
process.stdout.write(`run ${i}/${RUNS}… `);
const file = await runOnce(i);
if (!existsSync(file)) { console.log("no trace written (see " + file.replace(/json$/, "log") + ")"); continue; }
const r = summarise(file); rows.push(r); console.log("done");
const r = summarise(file); rows.push(r);
console.log(r.failed.length ? `INVALID — ${r.failed.length} page load(s) failed: ${r.failed[0]}` : "done");
}
const cols = [["ready", "ready"], ["toolbar", "toolbar"], ["firstPage", "1st page"], ["blocks6s", "blocked<6s"], ["addons", "addons"], ["overlaysLoaded", "overlays"], ["fetches6s", "fetch<6s"], ["proc15", "procs@15s"], ["mem15", "MB@15s"]];
console.log("\n" + ["run", ...cols.map((c) => c[1])].map((h) => h.padStart(11)).join(""));
rows.forEach((r, i) => console.log([String(i + 1), ...cols.map(([k]) => String(r[k] ?? "—"))].map((v) => v.padStart(11)).join("")));
rows.forEach((r, i) => console.log((r.failed.length ? "!" : " ") + [String(i + 1), ...cols.map(([k]) => String(r[k] ?? "—"))].map((v) => v.padStart(11)).join("")));
console.log(`\ntimes in ms since process start; MB = private memory of all Theseus processes. Traces: ${traceDir}`);

6
scripts/boot-trace/trace-main.js
View file

@ -43,6 +43,10 @@ for (const k of ["log", "warn", "error"]) {
}
const { app } = require("electron");
// With a script as the entry, Electron takes the script's folder as the app
// path, and main.js loads its pages by relative name (loadFile("chrome.html"))
// — every UI page then fails with ERR_FILE_NOT_FOUND. Point it at the app.
app.setAppPath(APP);
app.setPath("userData", process.env.THESEUS_USER_DATA);
// With a script as the entry, package.json isn't read: keep the real name and
// version so profile paths and version checks behave as in a normal run.
@ -54,6 +58,8 @@ app.on("ready", () => mark("app", "ready"));
app.on("web-contents-created", (_e, wc) => {
const id = wc.id; mark("wc", "created #" + id);
wc.once("did-finish-load", () => { let u = ""; try { u = wc.getURL(); } catch {} mark("wc", `loaded #${id} ${u.replace(/^file:\/\/\/.*\//, "file:").slice(0, 90)}`); });
// A failed main-frame load means the run did not measure a working launch.
wc.on("did-fail-load", (_e, code, desc, url, isMainFrame) => { if (isMainFrame && code !== -3) mark("fail", `#${id} ${code} ${desc} ${String(url).slice(0, 90)}`); });
});
const metrics = (label) => {
try {