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Issue 771582 link

Starred by 1 user
Status: Duplicate
Merged: issue 771192
Owner:
mvstan...@chromium.org
Closed: Oct 2017
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: 2
Type: Bug-Regression



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15.3% regression in v8.browsing_desktop at 505653:505735

Project Member Reported by mvstanton@google.com, Oct 4 2017 
Seems like a big increase, though I don't know how the CLs in 6.3.248 do that:

...
Update V8 to version 6.3.248.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/16e8fb38..98b4a1f8
Project Member

Comment 1 by 42576172...@developer.gserviceaccount.com, Oct 4 2017 

All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=771582

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=c516c90a070e2816f4bbd96592d40f2bd6f17fd4143dd3219aea5298cac3d893


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

chromium-rel-win8-dual
Project Member

Comment 3 by 42576172...@developer.gserviceaccount.com, Oct 4 2017

Mergedinto: 771192
Status: Duplicate (was: Assigned)

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

Suspected Commit
  Author : Benedikt Meurer
  Commit : 08db4d7652967c1ed12450a73ff53f5d6bbf1fdf
  Date   : Mon Oct 02 12:35:05 2017
  Subject: [ic] Properly handle polymorphic symbol accesses.

Bisect Details
  Configuration: win_8_perf_bisect
  Benchmark    : v8.browsing_desktop
  Metric       : memory:chrome:renderer_processes:reported_by_chrome:v8:heap:allocated_objects_size_max/browse_media/browse_media_tumblr
  Change       : 33.67% | 15749601.3333 -> 21052752.6667

Revision                           Result                   N
chromium@505652                    15749601 +- 394968       6      good
chromium@505694                    15869113 +- 314880       6      good
chromium@505715                    15457675 +- 772177       6      good
chromium@505726                    15820745 +- 506100       6      good
chromium@505731                    15501855 +- 1052729      6      good
chromium@505731,v8@08db4d7652      20936290 +- 2796513      6      bad       <--
chromium@505731,v8@17d86d76fb      21811818 +- 821816       6      bad
chromium@505731,v8@1fa0f9ba4c      21386892 +- 1843714      6      bad
chromium@505732                    21253893 +- 1259618      6      bad
chromium@505733                    20967170 +- 2842910      6      bad
chromium@505735                    21052753 +- 2575686      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.tumblr v8.browsing_desktop

More information on addressing performance regressions:
  http://g.co/ChromePerformanceRegressions

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8966666887412349040


For feedback, file a bug with component Speed>Bisection
►

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