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Issue metadata

Status: WontFix
Owner:
Closed: Aug 2016
Components:
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: 2
Type: Bug-Regression



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3.2%-3.6% regression in speedometer at 412016:412051

Project Member Reported by hablich@chromium.org, Aug 16 2016

Issue description

See the link to graphs below.
 
All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=638213

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgjpvBogoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgzrrHugoM


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

android-nexus6
chromium-rel-win7-x64-dual
Project Member

Comment 3 by 42576172...@developer.gserviceaccount.com, Aug 16 2016

Cc: dgozman@chromium.org
Owner: dgozman@chromium.org

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

Hi dgozman@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 : [DevTools] Rename entities in js_protocol, remove deprecated ones.
Author  : dgozman
Commit description:
  
BUG= 635947 

Review-Url: https://codereview.chromium.org/2249743002
Cr-Commit-Position: refs/heads/master@{#412043}
Commit  : 816474328ff9b737dffbe733c0d7b2c286151ffb
Date    : Mon Aug 15 21:00:28 2016


===== TESTED REVISIONS =====
Revision         Mean     Std Dev  N   Good?
chromium@412024  783.418  4.2928   27  good
chromium@412035  785.329  4.94339  27  good
chromium@412040  783.823  4.88718  18  good
chromium@412042  787.67   5.96398  18  good
chromium@412043  793.97   4.68841  12  bad    <--
chromium@412045  789.998  6.00867  18  bad

Bisect job ran on: win_x64_perf_bisect
Bug ID: 638213

Test Command: src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --also-run-disabled-tests speedometer
Test Metric: jQuery-TodoMVC/jQuery-TodoMVC
Relative Change: 0.39%
Score: 99.9

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/win_x64_perf_bisect/builds/1405
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9004169106531082720


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5808496218472448

| 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!
Cc: -dgozman@chromium.org
Owner: hablich@chromium.org
The patch in question cannot affect any performance - it's just a rename of a bunch of methods. And it was reverted soon after landing.

Also, from the bisect job looks like revisions before and after this have pretty similar score:
chromium@412042  787.67   5.96398  18  good
chromium@412043  793.97   4.68841  12  bad    <--
chromium@412045  789.998  6.00867  18  bad
Status: WontFix (was: Assigned)

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