Closed Bug 1212435 Opened 9 years ago Closed 9 years ago

20% Linux 64 dromaeo_dom regression on Mozilla-Inbound on October 06, 2015 from push cfc1820361f599c55128b29de4332f8d06511e07

Categories

(Core :: JavaScript Engine, defect)

defect
Not set
normal

Tracking

()

RESOLVED FIXED
Tracking Status
firefox44 --- affected

People

(Reporter: jmaher, Unassigned)

References

Details

(Keywords: perf, regression, Whiteboard: [talos_regression])

Talos has detected a Firefox performance regression from your commit cfc1820361f599c55128b29de4332f8d06511e07 in bug 589199.  We need you to address this regression.

This is a list of all known regressions and improvements related to your bug:
http://alertmanager.allizom.org:8080/alerts.html?rev=cfc1820361f599c55128b29de4332f8d06511e07&showAll=1

On the page above you can see Talos 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 Talos jobs in a pushlog format.

To learn more about the regressing test, please see: https://wiki.mozilla.org/Buildbot/Talos/Tests#Dromaeo_DOM

Reproducing and debugging the regression:
If you would like to re-run this Talos test on a potential fix, use try with the following syntax:
try: -b o -p linux64 -u none -t g3  # add "mozharness: --spsProfile" to generate profile data

To run the test locally and do a more in-depth investigation, first set up a local Talos environment:
https://wiki.mozilla.org/Buildbot/Talos/Running#Running_locally_-_Source_Code

Then run the following command from the directory where you set up Talos:
talos --develop -e <path>/firefox -a dromaeo_dom

Making a decision:
As the patch author we need your feedback to help us handle this regression.
*** Please let us know your plans by Monday, or the offending patch will be backed out! ***

Our wiki page oulines the common responses and expectations:
https://wiki.mozilla.org/Buildbot/Talos/RegressionBugsHandling
This regression looks to be in query.html:
https://treeherder.allizom.org/perf.html#/comparesubtest?originalProject=mozilla-inbound&originalRevision=d6059530b031&newProject=mozilla-inbound&newRevision=cfc1820361f5&originalSignature=5d92d35aeb763b5852f6e260466d6b9b8fc17a56&newSignature=5d92d35aeb763b5852f6e260466d6b9b8fc17a56

I don't see any other tests regressing with this change.  As it stands Linux64 is the only platform we run dromaeo_dom on, so I am not sure if this would affect osx or windows.

:shu, can you look into this regression to see why it is happening and what if anything we can do about it?
Flags: needinfo?(shu)
Probably a dupe of bug 1212183.
Depends on: 1212183
appears to be the same bug up front.
As a note, this sort of thing is why I was so opposed to completely shutting off dromaeo_dom.
bz++
Most likely a dup of bug 1212183 like Jan said. I'll push the fix today.
Flags: needinfo?(shu)
Bug 1212183 has landed and Dromaeo DOM scores are back to normal.
Status: NEW → RESOLVED
Closed: 9 years ago
Resolution: --- → FIXED
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