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Issue 700800 link

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Issue metadata

Status: Fixed
Owner: ----
Closed: Mar 2017
Cc:
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: ----
Type: ----



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webkit_unit_tests failing on 2 builders

Project Member Reported by yoichio@chromium.org, Mar 13 2017

Issue description

webkit_unit_tests failing on 2 builders

Builders failed on: 
- WebKit Win x64 Builder: 
  https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win%20x64%20Builder
- WebKit Win x64 Builder (dbg): 
  https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win%20x64%20Builder%20%28dbg%29





 
Project Member

Comment 3 by 42576172...@developer.gserviceaccount.com, Mar 14 2017

Cc: mlippautz@chromium.org
Owner: mlippautz@chromium.org

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

Hi mlippautz@chromium.org, the bisect results pointed to your CL, please take a look at the
results.


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

Suspected Commit
  Author : Michael Lippautz
  Commit : 68d6b6c613c8641748a390a10d886859e5afa38b
  Date   : Fri Mar 03 12:10:33 2017
  Subject: [heap] Support for minor MC marking during incremental marking part 2

Bisect Details
  Configuration: win_8_perf_bisect
  Benchmark    : v8.runtimestats.browsing_desktop_turbo
  Metric       : v8-gc-full-mark-compactor_avg/browse_media/browse_media_imgur
  Change       : 7.25% | 59.7226172951 -> 64.0523501401

Revision                           Result                  N
chromium@454780                    59.7226 +- 3.19759      6       good
chromium@454792                    59.3387 +- 2.71321      6       good
chromium@454794                    61.1231 +- 3.74029      9       good
chromium@454794,v8@de52562d8e      61.2858 +- 3.40293      14      good
chromium@454794,v8@f7bc5ef0bc      61.3464 +- 6.91551      14      good
chromium@454794,v8@14106d2d51      60.8767 +- 3.04079      9       good
chromium@454794,v8@68d6b6c613      64.7155 +- 4.86624      6       bad       <--
chromium@454794,v8@1a6487fd65      63.5936 +- 7.38029      14      bad
chromium@454795                    63.0959 +- 4.10555      9       bad
chromium@454798                    63.5284 +- 2.42896      6       bad
chromium@454804                    63.5937 +- 3.26274      6       bad
chromium@454828                    64.2429 +- 2.16623      6       bad
chromium@454875                    64.4255 +- 2.66989      6       bad
chromium@454964                    64.0524 +- 2.53789      6       bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=browse.media.imgur v8.runtimestats.browsing_desktop_turbo

Debug Info
  https://chromeperf.appspot.com/buildbucket_job_status/8985237337082509264

Is this bisect wrong?
  https://chromeperf.appspot.com/bad_bisect?try_job_id=6187224032346112


| 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!
Owner: ----
Status: Untriaged (was: Available)
I am confused about this one. The candidate CL only adds infrastructure behind a flag which is dead code using the default configuration. 

The initial report mentions a build failure while the bisect shows a perf regression. Something seems fishy here.
Labels: -Sheriff-Chromium
Status: Fixed (was: Untriaged)

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