RESOLVED FIXED 30293
[Qt] performance regressions on loading page after ImageDecoderQt changes 
https://bugs.webkit.org/show_bug.cgi?id=30293
Summary [Qt] performance regressions on loading page after ImageDecoderQt changes
Holger Freyther
Reported 2009-10-11 19:33:41 PDT
The old and new code has been executed on the same data and 30 iterations each. The majority of cases are faster, some show a regression we should need to understand. The point of this bug is to understand the cause of this regression. loading test row - slower in msecs on 30 iterations row01 - 3msec row02 - 6msec row14 - 844msec row16 - 1031msec row19 - 538msec row22 - 49msec row24 - 73msec row25 - 693msec row26 - 705msec row30 - 3msec row32 - 1785msec row37 - 35msec row39 - 261msec cycling: slower in msecs on 30 iterations row09 - 9msec row11 - 39msec row17 - 1msec row27 - 10msec row30 - 8msec row32 - 114msec row38 - 1msec row39 - 1051msec
Attachments
Current loading speed regressions (1.93 KB, application/octet-stream)
2009-10-12 03:12 PDT, Holger Freyther 		no flags
Details
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Holger Freyther
Comment 1 2009-10-12 01:16:40 PDT
(In reply to comment #0) > row32 - 1785msec This does not happen anymore. I will have to redo tests and verify the /etc/hosts.
Holger Freyther
Comment 2 2009-10-12 01:46:33 PDT
Okay, new regression list: RESULT : tst_Loading::load():"row06": - 576.83 msec per iteration (total: 17305, iterations: 30) + 623.29 msec per iteration (total: 18699, iterations: 30) RESULT : tst_Loading::load():"row09": - 3.33 msec per iteration (total: 100, iterations: 30) + 5.23 msec per iteration (total: 157, iterations: 30) RESULT : tst_Loading::load():"row10": - 872.39 msec per iteration (total: 26172, iterations: 30) + 875.20 msec per iteration (total: 26256, iterations: 30) RESULT : tst_Loading::load():"row12": - 411.80 msec per iteration (total: 12354, iterations: 30) + 412.33 msec per iteration (total: 12370, iterations: 30) RESULT : tst_Loading::load():"row14": - 215.7 msec per iteration (total: 6472, iterations: 30) + 304.4 msec per iteration (total: 9134, iterations: 30) RESULT : tst_Loading::load():"row18": - 1,000.6 msec per iteration (total: 30020, iterations: 30) + 1,019.8 msec per iteration (total: 30597, iterations: 30) RESULT : tst_Loading::load():"row19": - 23.6 msec per iteration (total: 710, iterations: 30) + 30.1 msec per iteration (total: 905, iterations: 30) RESULT : tst_Loading::load():"row20": - 80.29 msec per iteration (total: 2409, iterations: 30) + 98.70 msec per iteration (total: 2961, iterations: 30) RESULT : tst_Loading::load():"row22": - 2.7 msec per iteration (total: 83, iterations: 30) + 3.2 msec per iteration (total: 96, iterations: 30) RESULT : tst_Loading::load():"row25": - 49.03 msec per iteration (total: 1471, iterations: 30) + 49.23 msec per iteration (total: 1477, iterations: 30) RESULT : tst_Loading::load():"row26": - 138.1 msec per iteration (total: 4144, iterations: 30) + 152.2 msec per iteration (total: 4567, iterations: 30) RESULT : tst_Loading::load():"row30": - 5.36 msec per iteration (total: 161, iterations: 30) + 7.36 msec per iteration (total: 221, iterations: 30) RESULT : tst_Loading::load():"row31": - 40.66 msec per iteration (total: 1220, iterations: 30) + 44.93 msec per iteration (total: 1348, iterations: 30) RESULT : tst_Loading::load():"row32": - 327.3 msec per iteration (total: 9820, iterations: 30) + 354.60 msec per iteration (total: 10638, iterations: 30) RESULT : tst_Loading::load():"row37": - 44.33 msec per iteration (total: 1330, iterations: 30) + 62.53 msec per iteration (total: 1876, iterations: 30) RESULT : tst_Loading::load():"row38": - 238.1 msec per iteration (total: 7145, iterations: 30) + 259.9 msec per iteration (total: 7798, iterations: 30)
Holger Freyther
Comment 3 2009-10-12 03:12:01 PDT
Created attachment 41029 [details] Current loading speed regressions Current update. This is coming where everything is locally served. We are seeing 12 cases that seem to be slower than before. The problem is QBENCHMARK is not really good for statistics. If one loading took extremely long our whole result is screwed..
Benjamin Poulain
Comment 4 2010-05-04 13:31:31 PDT
Do you remember what you are comparing against? I don't have regressions compared to 4.6.2.
Benjamin Poulain
Comment 5 2010-09-23 11:24:40 PDT
The benchmarks are now run regularily. Image loading in with 4.7 if faster than with 4.6.
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