1666229 - 1.21 - 7.8% tp5o responsiveness / tp5o_webext responsiveness (linux64-shippable, linux64-shippable-qr) regression on push 85cff42af3a321f95791fb66cde1aff70107693c (Wed September 16 2020)

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, defect)

Description

[Alexandru Ionescu (needinfo me) [:alexandrui]]

Perfherder has detected a talos performance regression from push 85cff42af3a321f95791fb66cde1aff70107693c. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

8% tp5o responsiveness linux64-shippable-qr opt e10s stylo 1.58 -> 1.70
4% tp5o_webext responsiveness linux64-shippable opt e10s stylo 2.16 -> 2.26
4% tp5o_webext responsiveness linux64-shippable-qr opt e10s stylo 2.51 -> 2.60
1% tp5o_webext responsiveness linux64-shippable-qr opt e10s stylo 2.58 -> 2.61

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

[Jon Coppeard (:jonco)]

It seems that this benchmark doesn't measure responsiveness (see bug 1665600) but it may indicate that the performance of full GC changed.

Comment 2

[Timea Cernea [:tbabos][inactive]]

Setting up flags based on the time when the regressor Bug 844755 landed.

Comment 3

[Jon Coppeard (:jonco)]

Given the comments in bug 1665600 I don't think we should pay much attention to this benchmark at the moment.