131801 2014-04-17 13:10:26 -0700 [New Multicolumn] Column balancing is much slower than the old multi-column layout on float-multicol.html 2014-04-21 12:06:08 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 hyatt hyatt commit-queue esprehn+autocc glenn jonlee kondapallykalyan mstensho webkit-bug-importer WebkitBugTracker oldest_to_newest 1001651 0 hyatt 2014-04-17 13:10:26 -0700 Resize the browser window with fast/multicol/float-multicol.html loaded. It is very very slow. The old multicolumn code is much faster. There is a bit more precision to the balancing with the new code, but I'm not convinced it's worth the performance cost. The latter is probably (just a guess) doing way more relayouts to improve the accuracy. 1001874 1 webkit-bug-importer 2014-04-17 23:13:09 -0700 <rdar://problem/16656291> 1001890 2 mstensho 2014-04-18 01:49:14 -0700 In principle, it shouldn't have to do a lot more relayouts than the number of columns you have (unless you have a bug). I see that your test case has floats, and there's a bug in the new implementation in this regard. I reported it in Blink [1], and I have submitted a patch [2]. [1] https://code.google.com/p/chromium/issues/detail?id=361551 [2] https://codereview.chromium.org/242203003/ 1002583 3 hyatt 2014-04-21 11:44:53 -0700 (In reply to comment #2) > In principle, it shouldn't have to do a lot more relayouts than the number of columns you have (unless you have a bug). I see that your test case has floats, and there's a bug in the new implementation in this regard. I reported it in Blink [1], and I have submitted a patch [2]. > > [1] https://code.google.com/p/chromium/issues/detail?id=361551 > [2] https://codereview.chromium.org/242203003/ I'll look into merging this (see my email to you though that I consider tall-float1.html to be an invalid test case, so I'm not going to merge that). tall-float1.html doesn't pass in WebKit, since we properly handle the case where you don't create columns and don't establish a block formatting context in that case. 1002585 4 hyatt 2014-04-21 11:46:44 -0700 I verified that the fix for 361551 does stop the assertion and resolve the performance issue with this test case, so: \0/ 1002586 5 229815 hyatt 2014-04-21 11:51:25 -0700 Created attachment 229815 Patch 1002587 6 commit-queue 2014-04-21 11:52:29 -0700 Attachment 229815 did not pass style-queue: ERROR: Source/WebCore/rendering/RenderBlock.cpp:1475: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] Total errors found: 1 in 8 files If any of these errors are false positives, please file a bug against check-webkit-style. 1002592 7 hyatt 2014-04-21 11:59:22 -0700 I didn't mean to include tall-float1.html, so just ignore that part. 1002593 8 229815 enrica 2014-04-21 12:01:00 -0700 Comment on attachment 229815 Patch Looks good. 1002596 9 hyatt 2014-04-21 12:06:08 -0700 Landed in r167602. Note EWS is going to choke on tall-float1.html, but I didn't land that, so it should be fine. 229815 2014-04-21 11:51:25 -0700 2014-04-21 12:01:00 -0700 Patch patch.txt text/plain 7651 hyatt SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDE2NzYwMCkKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDI3IEBACisyMDE0LTA0LTIxICBEYXZpZCBI eWF0dCAgPGh5YXR0QGFwcGxlLmNvbT4KKworICAgICAgICBbTmV3IE11bHRpY29sdW1uXSBDb2x1 bW4gYmFsYW5jaW5nIGlzIHNsb3cgb24gZmxvYXQtbXVsdGljb2wuaHRtbAorICAgICAgICBodHRw czovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTMxODAxCisKKyAgICAgICAgUmV2 aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgQWRkZWQgZmFzdC9tdWx0aWNvbC90 YWxsLWZsb2F0Lmh0bWwKKworICAgICAgICAqIHJlbmRlcmluZy9SZW5kZXJCbG9jay5jcHA6Cisg ICAgICAgIChXZWJDb3JlOjpSZW5kZXJCbG9jazo6ZXhwYW5kc1RvRW5jbG9zZU92ZXJoYW5naW5n 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