55011 2011-02-22 17:38:50 -0800 Fragment parsing does not need to use HTMLSourceTracker 2011-02-24 23:24:16 -0800 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) PC OS X 10.5 RESOLVED FIXED P2 Normal --- 48719 1 eric webkit-unassigned abarth aestes commit-queue tonyg oldest_to_newest 355731 0 eric 2011-02-22 17:38:50 -0800 Fragment parsing does not need to use HTMLSourceTracker Fragment parsing still calls m_sourceTracker.start() and end() even though the data isn't needed. This is most noticable due to the malloc it causes. However that malloc will go away if bug 55005 is fixed. 355776 1 eric 2011-02-22 19:31:06 -0800 I'm not sure I believe it, but this patch seems to make our tiny-innerHTML benchmark twice as fast: Before patch: avg 5586.1 median 5594 stdev 41.295157101045135 min 5425 max 5633 After Patch: avg 2603.9 median 2609.5 stdev 32.500615378789355 min 2475 max 2649 I suspect (if those numbers are to be believed!) that's all due to avoiding bug 55005. 355779 2 83429 eric 2011-02-22 19:35:15 -0800 Created attachment 83429 Patch 355787 3 83429 abarth 2011-02-22 19:42:30 -0800 Comment on attachment 83429 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=83429&action=review > Source/WebCore/html/parser/HTMLDocumentParser.h:155 > + bool m_isParsingFragment; Can this class ask someone else whether we're parsing a fragment? 355791 4 eric 2011-02-22 19:46:26 -0800 The reason why we don't see the same thing with PerformanceTests/Parser/html-parser.html, is that html-parser and tiny-innerHTML are totally different benchmarks. tiny-innerHTML doesn't really even make sense as a benchmark, and was only created to model Peacekeeper (which I believe to be a broken benchmark!). tiny-innerHTML (and peacekeeper) are just taking very tiny numbers (the time it takes to innerHTML a single text node) and multiplying them by very very large numbers. In the real world, we don't care if innerHTML of a single text string takes .5 miliseconds or .2 miliseconds. :) Both are well beyond what any website uses. html-parser.html on the other hand is a very useful benchmark. 355794 5 83436 eric 2011-02-22 19:50:03 -0800 Created attachment 83436 Patch 355796 6 83436 abarth 2011-02-22 19:50:55 -0800 Comment on attachment 83436 Patch Yay. This seems like a much less invasive way to get this performance. 355797 7 eric 2011-02-22 19:57:13 -0800 I've looked at the next hottest section and it is again caused by bug 55005. 355837 8 aestes 2011-02-22 21:34:39 -0800 (In reply to comment #1) > I'm not sure I believe it, but this patch seems to make our tiny-innerHTML benchmark twice as fast: > > Before patch: > avg 5586.1 > median 5594 > stdev 41.295157101045135 > min 5425 > max 5633 > > After Patch: > avg 2603.9 > median 2609.5 > stdev 32.500615378789355 > min 2475 > max 2649 > > I suspect (if those numbers are to be believed!) that's all due to avoiding bug 55005. I'm not able to reproduce as much of a speedup as you're seeing. Here are the numbers I'm getting on tiny-innerHTML: Before: avg 2990.85 median 2967 stdev 68.55382921471272 min 2907 max 3198 After: avg 2562 median 2569 stdev 33.406586176980134 min 2420 max 2582 Is it possible that you were testing with debug builds? That would explain why your before numbers are so high since malloc() is much more expensive in debug. 355841 9 aestes 2011-02-22 21:37:22 -0800 Here are the peacekeeper numbers: Before: domDynamicCreationCreateElement 21691.973969631235 ops domDynamicCreationInnerHTML 13333.333333333334 ops domJQueryAttributeFilters 5047.955577990913 ops domJQueryBasics 4191.5 ops domJQueryContentFilters 1056 ops domJQueryHierarchy 1692.5 ops After: domDynamicCreationCreateElement 21739.130434782608 ops domDynamicCreationInnerHTML 14164.3059490085 ops domJQueryAttributeFilters 4954.5 ops domJQueryBasics 4182.5 ops domJQueryContentFilters 1080 ops domJQueryHierarchy 1713.5 ops 355879 10 aestes 2011-02-22 22:43:05 -0800 (In reply to comment #4) > The reason why we don't see the same thing with PerformanceTests/Parser/html-parser.html, is that html-parser and tiny-innerHTML are totally different benchmarks. > > tiny-innerHTML doesn't really even make sense as a benchmark, and was only created to model Peacekeeper (which I believe to be a broken benchmark!). tiny-innerHTML (and peacekeeper) are just taking very tiny numbers (the time it takes to innerHTML a single text node) and multiplying them by very very large numbers. In the real world, we don't care if innerHTML of a single text string takes .5 miliseconds or .2 miliseconds. :) Both are well beyond what any website uses. > > html-parser.html on the other hand is a very useful benchmark. I don't think we should discount the prevalence of repeated calls to innerHTML as a content generation technique. For instance, here's a benchmark from quirksmode comparing DOM API to innerHTML for creating a 50x50 table: http://www.quirksmode.org/dom/innerhtml.html One interesting thing this benchmark demonstrates is that, especially in IE, innerHTML is significantly faster than using DOM API. It seems likely that at least some content authors have used this as a rule of thumb and designed pages that rely on innerHTML to generate dynamic content. That convinces me that improving fragment parsing performance is an important task regardless of our opinions of Peacekeeper as a benchmark. 355946 11 83436 commit-queue 2011-02-23 02:07:50 -0800 Comment on attachment 83436 Patch Rejecting attachment 83436 from commit-queue. Failed to run "['./Tools/Scripts/webkit-patch', '--status-host=queues.webkit.org', '--bot-id=cr-jail-3', 'build-..." exit_code: 2 Last 500 characters of output: URL ........................... http/tests/security/listener ....... http/tests/security/mixedContent ................ http/tests/security/originHeader ..... http/tests/security/postMessage ....... http/tests/security/xssAuditor ................ http/tests/security/xssAuditor/dom-write-innerHTML.html -> failed Exiting early after 1 failures. 22353 tests run. 618.34s total testing time 22352 test cases (99%) succeeded 1 test case (<1%) had incorrect layout 14 test cases (<1%) had stderr output Full output: http://queues.webkit.org/results/7982076 355954 12 eric 2011-02-23 02:17:43 -0800 (In reply to comment #8) > Is it possible that you were testing with debug builds? That would explain why your before numbers are so high since malloc() is much more expensive in debug. It's not possible to run the benchmark in a Debug build (slow script dialog), so no. :) I suspect that this benchmark is so tight that we're hitting hardware caching differences, and that the improvements aren't necessarily real. It's also possible malloc is more expensive (relatively speaking) on my machine (due to locking) because it's a 16 core machine instead of whatever you're testing on. Given that Peacekeeper didn't impove as much as we saw tiny-innerHTML, perhaps the reduced benchmark is too reduced. 355971 13 eric 2011-02-23 03:13:03 -0800 @abarth: I've removed support for XSSFiltering innerHTML content as per our discussion. Please re-confirm that this is OK. 355973 14 83463 eric 2011-02-23 03:13:44 -0800 Created attachment 83463 Patch 355981 15 eric 2011-02-23 03:28:26 -0800 (In reply to comment #10) > (In reply to comment #4) > > The reason why we don't see the same thing with PerformanceTests/Parser/html-parser.html, is that html-parser and tiny-innerHTML are totally different benchmarks. > > > > tiny-innerHTML doesn't really even make sense as a benchmark, and was only created to model Peacekeeper (which I believe to be a broken benchmark!). tiny-innerHTML (and peacekeeper) are just taking very tiny numbers (the time it takes to innerHTML a single text node) and multiplying them by very very large numbers. In the real world, we don't care if innerHTML of a single text string takes .5 miliseconds or .2 miliseconds. :) Both are well beyond what any website uses. > > > > html-parser.html on the other hand is a very useful benchmark. > > I don't think we should discount the prevalence of repeated calls to innerHTML as a content generation technique. For instance, here's a benchmark from quirksmode comparing DOM API to innerHTML for creating a 50x50 table: > > http://www.quirksmode.org/dom/innerhtml.html Sure. It's just that the bechmark does 100k innerHTMLs, each of which takes only 0.056 milliseconds! The fact that we're fretting about reducing each to 0.026 milliseconds is silly IMO. :) Shaving 0.03ms per innerHTML does not seem worth our time (which is why I continue to believe the benchmark is crap). It's more interesting that we can parse an entire 5MB HTML file in 800ms, and continuing to make that number smaller seems useful. > One interesting thing this benchmark demonstrates is that, especially in IE, innerHTML is significantly faster than using DOM API. It seems likely that at least some content authors have used this as a rule of thumb and designed pages that rely on innerHTML to generate dynamic content. Cool. I'll take a look at http://www.quirksmode.org/dom/innerhtml.html and see if there is anything useful there. > That convinces me that improving fragment parsing performance is an important task regardless of our opinions of Peacekeeper as a benchmark. Yes, but peacekeeper (or at lest tiny-innerHTML) does not actually test fragment parsing performance since total time to parse the example fragment is counted in microseconds. :) We could continue to improve our longer-running parser benchmarks and probably see further improvements to the PLT score (which is also basically useless due to being too small a set these days) and other "more real" pages. 355984 16 eric 2011-02-23 03:29:53 -0800 I think we mostly agree, btw. And are just re-stating the same things back and forth. :) I'm interested in improving perf here and will spend another day looking at this tomorrow. 356935 17 83463 commit-queue 2011-02-24 06:34:26 -0800 Comment on attachment 83463 Patch Clearing flags on attachment: 83463 Committed r79554: <http://trac.webkit.org/changeset/79554> 356936 18 commit-queue 2011-02-24 06:34:30 -0800 All reviewed patches have been landed. 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