1666237 - 3.87 - 4.05% Base Content Heap Unclassified (linux1804-64-shippable, linux1804-64-shippable-qr) regression on push 71d14ede1fcb8eaf54659c37226dd78eb23ed6ac (Wed September 16 2020)

Status: VERIFIED FIXED

(Core :: JavaScript Engine, defect, P1)

Description

[Florin Strugariu [:Bebe]]

Perfherder has detected a awsy performance regression from push 71d14ede1fcb8eaf54659c37226dd78eb23ed6ac. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

4% Base Content Heap Unclassified linux1804-64-shippable opt 4,042,998.33 -> 4,206,783.33
4% Base Content Heap Unclassified linux1804-64-shippable-qr opt 4,087,603.69 -> 4,247,949.33
4% Base Content Heap Unclassified linux1804-64-shippable-qr opt 4,088,900.33 -> 4,247,099.33

Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests. Please follow our guide to handling regression bugs and let us know your plans within 3 business days, or the offending patch(es) will be backed out in accordance with our regression policy.

For more information on performance sheriffing please see our FAQ.

Comment 1

[Ted Campbell [:tcampbell]]

Bug 1666274 will address the regression (and the similar one introduced earlier that did not trigger alert). We can evaluate complexity of uplift to 82.

Comment 2

[Ted Campbell [:tcampbell]]

I will plan for an uplift of Bug 1666274 in next couple days.

Comment 3

[Ted Campbell [:tcampbell]]

Fixed by Bug 1666274 https://treeherder.mozilla.org/perf.html#/graphs?highlightAlerts=0&series=autoland,2204015,1,4&timerange=1209600&zoom=1599760398000,1600950334804,3920797.3333333395,4349386.666666662

Comment 4

[Ted Campbell [:tcampbell]]

FF82 fixed by uplift of Bug 1666274: https://treeherder.mozilla.org/perf.html#/graphs?highlightAlerts=1&highlightedRevisions=7dd5c43f1b5c&series=mozilla-beta,2024912,1,4&timerange=2592000