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Issue 651807 link

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Issue metadata

Status: WontFix
Owner:
Closed: Sep 2016
Cc:
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: 2
Type: Bug-Regression



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18.8% regression in blink_perf.shadow_dom at 421602:421670

Project Member Reported by pmeenan@chromium.org, Sep 30 2016

Issue description

See the link to graphs below.
 
All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=651807

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg5daNqwkM


Bot(s) for this bug's original alert(s):

android-galaxy-s5
Project Member

Comment 3 by 42576172...@developer.gserviceaccount.com, Sep 30 2016

Cc: csharrison@chromium.org
Owner: csharrison@chromium.org

=== Auto-CCing suspected CL author csharrison@chromium.org ===

Hi csharrison@chromium.org, the bisect results pointed to your CL below as possibly
causing a regression. Please have a look at this info and see whether
your CL be related.


===== BISECT JOB RESULTS =====
Status: completed


===== SUSPECTED CL(s) =====
Subject : Add histograms for parseAuthorStyleSheet and updateStyle
Author  : csharrison
Commit description:
  
BUG= 642722 

Review-Url: https://codereview.chromium.org/2344633005
Cr-Commit-Position: refs/heads/master@{#421659}
Commit  : 78f6cc334b7c0231a6a9a6fe6de9f7183c5796ce
Date    : Wed Sep 28 22:22:09 2016


===== TESTED REVISIONS =====
Revision         Mean     Std Dev   N  Good?
chromium@421601  102.836  2.9472    5  good
chromium@421636  105.484  2.98905   5  good
chromium@421653  105.113  0.243175  5  good
chromium@421658  105.443  2.59893   5  good
chromium@421659  122.831  1.33737   5  bad    <--
chromium@421660  122.385  1.65997   5  bad
chromium@421662  123.337  0.63783   5  bad
chromium@421670  127.689  2.62638   5  bad

Bisect job ran on: android_s5_perf_bisect
Bug ID: 651807

Test Command: src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --also-run-disabled-tests blink_perf.shadow_dom
Test Metric: SmallDistributionWithLayout/SmallDistributionWithLayout
Relative Change: 24.17%
Score: 99.9

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/android_s5_perf_bisect/builds/1047
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9000093760434568784


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=6339255440244736

| O O | Visit http://www.chromium.org/developers/speed-infra/perf-bug-faq
|  X  | for more information addressing perf regression bugs. For feedback,
| / \ | file a bug with component Tests>AutoBisect.  Thank you!
Status: WontFix (was: Assigned)
Let's WontFix. This is a micro-benchmark and these metrics are temporary for the Lazy Parsing experiment.

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