1670177 - 2.52 - 4.83% build times (linux64-shippable) regression on push 9f3604e327fe8e8ccd1ad2b29bbf11208a7f9610 (Wed September 23 2020)

Status: RESOLVED WONTFIX

(Firefox Build System :: Toolchains, defect)

Description

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

Perfherder has detected a build_metrics performance regression from push 9f3604e327fe8e8ccd1ad2b29bbf11208a7f9610. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

5% build times linux64-shippable opt nightly taskcluster-m5.4xlarge 2,872.93 -> 3,011.82
3% build times linux64-shippable opt nightly taskcluster-m5.4xlarge 2,958.45 -> 3,032.98

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 1666525

Comment 2

[(Away)]

Unfortunately there isn't good return on investment in investigating this, a deep dive for this type of issue would take far too much time to be worthwhile.