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55db157391
In bug 1264235 we have some indication that observed bugs with the startup cache might have been resolved, but we don't really know until we collect data. Collecting these stats will give us the ability to have more certainty that the startup cache is functioning correctly in the wild. Differential Revision: https://phabricator.services.mozilla.com/D19573 --HG-- extra : moz-landing-system : lando
41 lines
1.7 KiB
JavaScript
41 lines
1.7 KiB
JavaScript
/* Any copyright is dedicated to the Public Domain.
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http://creativecommons.org/publicdomain/zero/1.0/ */
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"use strict";
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const LABELS_STARTUP_CACHE_REQUESTS = {
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HitMemory: 0,
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HitDisk: 1,
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Miss: 2,
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};
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add_task(async function() {
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Services.obs.notifyObservers(null, "startupcache-invalidate");
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Services.telemetry.getSnapshotForHistograms("main", true);
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let newWin = await BrowserTestUtils.openNewBrowserWindow();
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let snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
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function histValue(label) {
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return snapshot.parent.STARTUP_CACHE_REQUESTS.values[label] || 0;
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}
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Assert.equal(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitMemory), 0);
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Assert.equal(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitDisk), 0);
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Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.Miss), 0);
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await BrowserTestUtils.closeWindow(newWin);
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newWin = await BrowserTestUtils.openNewBrowserWindow();
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snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
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Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitMemory), 0);
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Assert.equal(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitDisk), 0);
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Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.Miss), 0);
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await BrowserTestUtils.closeWindow(newWin);
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Services.obs.notifyObservers(null, "startupcache-invalidate", "memoryOnly");
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newWin = await BrowserTestUtils.openNewBrowserWindow();
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snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
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Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitMemory), 0);
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Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitDisk), 0);
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// Some misses can come through - just ensure it's a small number
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Assert.ok(histValue(LABELS_STARTUP_CACHE_REQUESTS.Miss) < 5);
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await BrowserTestUtils.closeWindow(newWin);
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});
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