1451732 - 54.98 - 55.92% Resident Memory (windows7-32) regression on push 149a759643fbf35d45d4ffbc86706db8ba2d4ffd (Wed Apr 4 2018)

Status: RESOLVED INVALID

(Firefox :: Untriaged, defect)

Description

[Ionuț Goldan [:igoldan]]

We have detected an awsy regression from push:

https://hg.mozilla.org/integration/autoland/pushloghtml?changeset=149a759643fbf35d45d4ffbc86706db8ba2d4ffd

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

Regressions:

 56%  Resident Memory windows7-32 pgo stylo     313,699,622.34 -> 489,110,071.85
 55%  Resident Memory windows7-32 opt stylo     320,724,810.05 -> 497,050,205.40


You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=12520

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://wiki.mozilla.org/AWSY/Tests

Comment 1

[Ryan VanderMeulen [:RyanVM]]

That regression range seems highly improbable.

Comment 2

[Ionuț Goldan [:igoldan]]

This is a huge perf regression for which I cannot find the culprit.

I started doing retriggers & backfills for previous changesets. I then noticed that the new values are equal to those when this 1st happened. This is strange and I'm thinking that maybe something happened with the environment.

:jmaher Do you have any clue about this? Who can we ask for more details?

Comment 3

[Ionuț Goldan [:igoldan]]

(In reply to Ryan VanderMeulen [:RyanVM] from comment #1)
> That regression range seems highly improbable.

I agree. The range message was automatically generated and it is not valid at all.

Comment 4

[Ryan VanderMeulen [:RyanVM]]

TC worker change maybe?

Comment 5

[Ionuț Goldan [:igoldan]]

This only happens on Windows 7. Other platforms aren't affected.

Comment 6

[Joel Maher ( :jmaher ) (UTC -8)]

this showed up on mozilla-beta- most likely a windows worker change.

Comment 7

[Ryan VanderMeulen [:RyanVM]]

Almost certainly an infra change and not an actual product change.