1635125 - 36.61 - 47.64% build times (android-4-0-armv7-api16, android-5-0-x86_64, linux64) regression on push 5f1618cc19f5d34eedb2dc62dd64043b62af4e48 (Fri May 1 2020)

Status: RESOLVED INVALID

(Core :: DOM: CSS Object Model, defect)

Description

[Marian Raiciof [:marauder]]

Perfherder has detected a build_metrics performance regression from push 5f1618cc19f5d34eedb2dc62dd64043b62af4e48. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

48% build times android-4-0-armv7-api16 debug taskcluster-c5d.4xlarge 809.47 -> 1,195.08
38% build times linux64 debug taskcluster-c5.4xlarge 1,090.85 -> 1,506.39
37% build times android-5-0-x86_64 opt taskcluster-c5.4xlarge 911.01 -> 1,244.49

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

[Erik Nordin [:nordzilla]]

Looking at the graph now, it appears to have recovered.
https://treeherder.mozilla.org/perf.html#/graphs?timerange=1209600&series=autoland,2273416,1,2

I can't think of anything in my patch that should affect build times in any noticeable way.
I will keep an eye on the graph for now.

Comment 2

[Hiroyuki Ikezoe (:hiro)]

Closing as per comment 1. It looks like a cache missed case or some such I suppose.