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Issue metadata

Status: Duplicate
Merged: issue 701361
Owner: ----
Closed: Mar 2017
Cc:
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: 2
Type: Bug-Regression



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30.8% regression in blink_perf.css at 456321:456342

Project Member Reported by nzolghadr@chromium.org, Mar 15 2017

Issue description

See the link to graphs below.
 
All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=701828

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg9OW6vwkM


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

android-one
Project Member

Comment 3 by 42576172...@developer.gserviceaccount.com, Mar 15 2017

Mergedinto: 701361
Status: Duplicate (was: Untriaged)

=== BISECT JOB RESULTS ===
Perf regression found with culprit

Suspected Commit
  Author : meade
  Commit : 3a001533b29c0fe28f2354285b2c2ac8d57d8ce6
  Date   : Mon Mar 13 05:26:20 2017
  Subject: Un-DCHECK-guard ThreadRestrictionVerifier for strings.

Bisect Details
  Configuration: android_one_perf_bisect
  Benchmark    : blink_perf.css
  Metric       : AttributeDescendantSelector/AttributeDescendantSelector
  Change       : 32.21% | 28.6361755821 -> 19.4118028299

Revision             Result                   N
chromium@456320      28.6362 +- 0.228166      6      good
chromium@456322      28.769 +- 0.115399       6      good
chromium@456323      18.5149 +- 0.982179      6      bad       <--
chromium@456326      19.2618 +- 0.822548      6      bad
chromium@456331      19.0098 +- 0.244034      6      bad
chromium@456342      19.4118 +- 0.352783      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests blink_perf.css

Debug Info
  https://chromeperf.appspot.com/buildbucket_job_status/8985038970899296944

Is this bisect wrong?
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5289261865107456


| 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 Speed>Bisection.  Thank you!

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