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Issue metadata

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



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11.5% regression in blink_perf.events at 390088:390129

Project Member Reported by qyears...@chromium.org, Apr 28 2016

Issue description

See the link to graphs below.
 
All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=607639

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg5IriuwoM


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

android-one
Project Member

Comment 2 by 42576172...@developer.gserviceaccount.com, Apr 28 2016

Cc: scottmg@chromium.org
Owner: scottmg@chromium.org

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

Hi scottmg@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 : Turn on assert_no_deps for blink in browser
Author  : scottmg
Commit description:
  
R=brettw@chromium.org
BUG= 582206 

Review-Url: https://codereview.chromium.org/1926443002
Cr-Commit-Position: refs/heads/master@{#390123}
Commit  : ffb95be04fb4effb750884083cb1c166c5499b7a
Date    : Wed Apr 27 18:05:14 2016


===== TESTED REVISIONS =====
Revision         Mean       Std Dev      N  Good?
chromium@390087  0.0604217  0.000226058  5  good
chromium@390108  0.0607515  0.000159184  5  good
chromium@390119  0.0599416  0.000464867  5  good
chromium@390122  0.0601607  0.000182736  5  good
chromium@390123  0.0540433  0.000174236  5  bad    <--
chromium@390124  0.05406    0.000275185  5  bad
chromium@390129  0.0541687  0.000161585  5  bad

Bisect job ran on: android_one_perf_bisect
Bug ID: 607639

Test Command: src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --also-run-disabled-tests blink_perf.events
Test Metric: hit-test-lots-of-layers/hit-test-lots-of-layers
Relative Change: 10.35%
Score: 99.9

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/android_one_perf_bisect/builds/1288
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9014113217096923040


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5864809728311296

| 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!
Owner: ----
I don't think that's possible, it's a build-time only debug check.
Looks like this got fixed and subsequently regressed again.  I'll try another bisect, but it's probably safe to close this.
Cc: majidvp@chromium.org
Status: WontFix (was: Assigned)
Closing given that the graph has recovered subsequently (see attached image).
Screen Shot 2016-05-19 at 2.57.51 PM.png
107 KB View Download

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