1810947 - 0.31 - 0.3% Base Content JS / Base Content JS + 2 more (Linux, OSX, Windows) regression on Fri January 13 2023

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, defect)

Description

[Acasandrei Beatrice (needinfo me)]

Perfherder has detected a awsy performance regression from push f2457a464d0333448b4f53e5b768653a83d9701a. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

Ratio	Test	Platform	Options	Absolute values (old vs new)
0.31%	Base Content JS	linux1804-64-shippable-qr	fission	1,618,264.00 -> 1,623,320.67
0.30%	Base Content JS	macosx1015-64-shippable-qr	fission	1,622,168.00 -> 1,627,064.00
0.30%	Base Content JS	windows10-64-2004-shippable-qr	fission	1,626,128.00 -> 1,630,976.00
0.30%	Base Content JS	macosx1015-64-shippable-qr	fission	1,622,168.00 -> 1,627,064.00

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) may be backed out in accordance with our regression policy.

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Comment 1

[Tooru Fujisawa [:arai]]

bug 1807228 patch reverts the change done by bug 1805149 patch, and bug 1805149 patch and others improved the score by 0.3%.

https://treeherder.mozilla.org/perfherder/graphs?highlightAlerts=1&highlightChangelogData=1&highlightCommonAlerts=0&series=autoland,3806445,1,4&timerange=5184000&zoom=1671618937399,1671622102895,1593472.3475765912,1617820.3042848422

So this regression is expected and nothing gets regressed compared to before bug 1805149 patch.
re-landing the bug 1807228 patch with other performance fix will re-improve the score again.