1651942 - 0.31 - 0.44% Base Content JS (linux1804-64-shippable, linux1804-64-shippable-qr, macosx1014-64-shippable, windows10-64-shippable-qr, windows7-32-shippable) regression on push 63e43493e12320a84d7d20a31ceb2d8e00160868 (Wed July 8 2020)

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, defect)

Description

[Florin Strugariu [:Bebe]]

Perfherder has detected a awsy performance regression from push 63e43493e12320a84d7d20a31ceb2d8e00160868. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

0.44% Base Content JS macosx1014-64-shippable opt 3,541,675.00 -> 3,557,260.00
0.41% Base Content JS windows7-32-shippable opt 2,756,521.33 -> 2,767,716.67
0.34% Base Content JS linux1804-64-shippable opt 3,521,349.33 -> 3,533,348.33
0.32% Base Content JS windows10-64-shippable-qr opt 3,582,776.00 -> 3,594,310.00
0.31% Base Content JS linux1804-64-shippable-qr opt 3,522,325.67 -> 3,533,176.67

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

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1647794

Comment 2

[Adam Vandolder [:avandolder]]

This patch adds features which require additional self-hosted code, so this is expected as was seen in https://bugzilla.mozilla.org/show_bug.cgi?id=1644430 and https://bugzilla.mozilla.org/show_bug.cgi?id=1646371.