1497790 - 7.82 - 12.11% build times (linux64) regression on push e3d243f3ff07 (Mon Oct 8 2018)

Status: RESOLVED WONTFIX

(Firefox Build System :: General, defect)

Description

[Ionuț Goldan [:igoldan]]

We have detected a build metrics regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=741a43f63ec42206b3bf86a33d30b1cd9d449aa3&tochange=e3d243f3ff07fa45ae97858db2e0ccf07822918f

As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

 12%  build times linux64 opt taskcluster-c5d.4xlarge tup     937.59 -> 1,051.14
 11%  build times linux64 opt taskcluster-m5d.4xlarge tup     981.11 -> 1,092.33
 11%  build times linux64 opt taskcluster-c5.4xlarge tup      987.03 -> 1,090.76
  9%  build times linux64 opt taskcluster-m4.4xlarge tup      1,293.35 -> 1,415.64
  8%  build times linux64 opt taskcluster-c4.4xlarge tup      1,213.91 -> 1,308.80


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=16570

On the page above you can see an alert for each affected platform as well as a link to a graph showing the history of scores for this test. There is also a link to a treeherder page showing the jobs in a pushlog format.

To learn more about the regressing test(s), please see: https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Automated_Performance_Testing_and_Sheriffing/Build_Metrics

Comment 1

[Chris Manchester (limited bugmail, email directly)]

This is expected. Turning on lto means enabling optimizations that are likely to be expensive.