1665860 - 2.06 - 5.85% Explicit Memory / Resident Memory (linux1804-64-shippable, macosx1014-64-shippable, windows10-64-shippable, windows10-64-shippable-qr, windows7-32-shippable) regression on push 6450088b6b73ffc17c79cd7097b1bfe30d00e207 (Mon September 14 2020)

Status: RESOLVED WONTFIX

(Core :: XPCOM, defect)

Description

[Florin Strugariu [:Bebe]]

Perfherder has detected a awsy performance regression from push 6450088b6b73ffc17c79cd7097b1bfe30d00e207. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

6% Explicit Memory windows7-32-shippable opt 263,156,373.59 -> 278,547,344.72
4% Explicit Memory windows10-64-shippable opt 332,548,021.13 -> 347,143,002.16
4% Explicit Memory windows10-64-shippable-qr opt 351,797,740.90 -> 367,002,442.63
4% Explicit Memory linux1804-64-shippable opt 351,700,903.34 -> 365,480,947.30
3% Explicit Memory macosx1014-64-shippable opt 371,143,891.74 -> 383,912,018.81
3% Explicit Memory linux1804-64-shippable opt tp6 468,295,047.35 -> 484,334,960.82
3% Explicit Memory macosx1014-64-shippable opt tp6 479,081,782.33 -> 492,614,355.61
2% Resident Memory windows10-64-shippable-qr opt 554,859,955.87 -> 567,117,522.32
2% Resident Memory linux1804-64-shippable opt tp6 724,408,665.13 -> 739,365,051.47

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 1656261

Comment 2

[Alex Thayer [:alexical] (she/her)]

Yeah - that all makes sense. Ultimately though the patches in bug 1656261 are a backout of recent startupcache work though, so this is only sort of a regression. That work never made it to release.