[Webkit-unassigned] [Bug 40779] [Chromium] Perf regression following landing of HTML5 parser

Thu Jun 17 10:18:47 PDT 2010

https://bugs.webkit.org/show_bug.cgi?id=40779

--- Comment #1 from Tony Gentilcore <tonyg at chromium.org>  2010-06-17 10:18:47 PST ---
Adding some more data to the bug.

First, this only seems to happen on the Vista cycler (XP is fine).

Second, the regression seems to be due to a few outliers, rather than a consistent move across all runs (see below). This is a good thing as it means it is probably a bug rather than something inherently slower about the new parser.

Sample run times:
[68,65,149,41,49,60,14,183,49,139,104,114,230,140,90,224,84,70,191,38,65,69,102,209,77,53,148,137,95,28,43365,39,61398,63,129,170,98,131,38,168,85,43696,84,203,220,143,93,102,403,199,258,306,210,294,122,312,27,10,74,27,24,47,11,111,28,89,69,67,92,64,56,122,72,49,119,30,40,43,69,129,41,34,88,98,76,18,108,48,215,50,76,115,76,78,31,80,47,21389,64,149,168,115,72,60,280,140,216,214,168,214,90,231,28,10,74,28,25,44,10,112,30,90,70,68,96,63,58,123,71,45,119,28,39,40,72,132,41,34,83,97,76,18,108,48,214,52,76,118,75,75,30,79,47,79,65,147,167,117,61,60,278,137,221,203,157,206,89,227,28,11,74,28,25,43,9,112,28,90,69,67,92,64,58,122,69,45,121,28,38,40,70,131,41,34,83,122,77,17,109,48,215,51,77,117,76,77,31,79,47,79,64,148,166,114,61,60,279,135,218,199,175,206,88,229,27,10,73,28,25,44,10,111,29,90,69,70,92,66,58,125,69,45,118,28,38,40,72,130,41,35,83,121,74,18,111,29,216,52,76,116,74,76,31,81,47,79,64,148,167,114,62,60,282,139,231,205,165,206,89,229,28,10,74,28,26,44,10,113,29,90,70,68,96
 ,65,59,123,71,59,129,28,40,41,74,133,42,35,84,97,76,19,110,29,217,53,78,117,76,76,31,80,47,80,67,149,167,114,61,60,283,139,221,207,158,209,89,228,27,13,74,29,26,45,10,113,30,91,69,68,93,63,59,125,70,46,120,27,39,40,73,130,42,37,84,123,75,18,110,47,217,52,77,117,75,76,31,79,47,80,65,150,167,115,62,60,284,139,221,204,161,207,91,231,29,12,77,29,25,44,10,117,29,90,69,69,93,64,60,124,71,46,120,29,39,43,73,132,42,35,84,97,75,18,110,49,218,52,77,118,75,76,32,81,48,80,64,148,167,119,62,61,284,140,222,203,160,208,90,231,28,12,74,29,28,44,10,113,30,92,70,69,94,64,59,125,70,46,122,28,39,41,74,131,43,35,84,98,79,18,43384,26,219,52,77,117,76,76,32,81,48,82,64,149,169,115,62,60,285,140,221,205,162,206,89,231,28,11,74,29,25,44,10,116,28,90,69,69,93,65,60,123,70,46,118,28,39,41,73,130,42,35,84,97,78,19,111,48,220,53,77,118,75,74,31,83,46,80,67,149,168,114,63,60,286,140,223,206,160,217,93,229] ms

Reference run times:
[679,87,163,46,62,68,17,207,53,154,112,113,269,144,85,259,89,101,199,72,71,66,111,234,56,36,124,105,73,22,163,56,329,64,157,148,79,148,31,144,70,82,81,215,229,153,105,104,375,204,462,328,182,451,124,269,37,13,77,31,29,53,12,117,33,102,75,74,103,64,63,127,75,55,133,32,43,43,82,150,34,34,85,85,67,15,108,25,194,54,79,95,66,68,29,72,49,73,58,146,168,107,69,66,329,124,261,227,206,205,81,201,28,13,75,29,28,48,14,109,34,93,72,72,108,66,61,133,75,49,132,31,43,43,80,153,45,39,99,136,68,20,109,26,203,56,81,115,64,69,28,71,42,72,58,150,152,99,53,56,278,146,261,222,183,251,96,235,34,13,77,31,29,49,12,108,34,103,75,74,107,66,61,125,79,54,134,32,43,43,83,153,37,33,84,84,68,15,109,31,222,50,69,120,67,76,33,80,49,93,71,162,159,120,69,62,334,124,222,188,185,196,75,211,30,12,79,32,28,50,12,116,35,102,76,74,104,65,64,126,68,52,121,29,36,37,68,127,43,41,99,133,85,24,125,31,230,55,81,95,67,66,29,72,47,74,60,147,151,101,69,65,335,119,222,201,197,216,94,220,34,12,77,29,29,49,13,116,33,91,76,78,105,
 69,60,129,74,51,130,56,44,43,84,159,41,32,83,85,70,22,110,46,199,55,82,121,66,70,29,72,44,74,59,152,166,125,54,57,280,134,265,222,208,225,99,237,34,10,72,27,24,43,10,109,33,103,76,76,105,67,64,125,79,50,135,27,36,37,68,128,46,40,100,136,68,15,108,50,217,55,69,124,79,77,34,80,50,87,72,166,162,99,55,55,278,153,264,223,185,220,94,235,36,14,77,27,24,44,10,117,35,104,76,75,104,64,65,128,76,53,134,27,35,38,68,128,44,41,100,136,84,24,125,31,233,55,73,86,80,76,34,82,53,90,71,169,167,99,55,58,280,116,223,202,219,202,81,195,28,13,75,30,29,47,15,119,36,96,72,73,104,68,62,132,74,50,131,32,43,44,85,152,37,32,84,84,71,20,110,25,209,49,81,114,66,70,29,73,48,73,61,151,152,104,55,57,281,121,223,195,171,194,80,216,28,10,72,27,23,45,11,109,28,103,76,75,104,67,65,126,77,50,134,32,44,44,85,148,37,33,85,86,68,15,122,38,242,56,70,125,82,77,34,81,51,87,72,163,144,119,55,55,280,150,265,229,168,218,95,236] ms

Notice that in the reference run, all times are 3 digits. In the sample run, most times seem to line up with the occasional 5 digit time.

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