WebKit Apocrypha

It is time to try out my new freya tool. Only some web-sites and a fresh Qt (4.6.0) and QtWebKit (r51481) are needed. The values are peak memory consumptions, which is not necessary the best choice (since the sum of their total value is greater than the peak memory consumption), but at least we can see the memory hungry parts of QtWebKit.

Note: The numbers are depending on the grouping rules. I tried to improve them as far as I could, but I feel there is still room for improvement. For example, it would be interesting to see the total memory consumption of image handling, but it is scattered through many files in many directories.

http://www.google.com

Total: 3.8Mb

libs: 1.7Mb
ld: 1.1Mb
libfreetype: 293.4Kb

Qt: 1.1Mb

Qt-gui: 965.1Kb
QFreetypeFace::getFace (qfontengine_ft.cpp:238) 669.8Kb
QX11PixmapData::fromImage (qpixmap_x11.cpp:648) 118.5Kb

Qt-corelib: 312.5Kb

locale_encode (qfile.cpp:66) 98.0Kb

Qt-network: 125.7Kb

WebKit: 1.0Mb

JavaScriptCore: 580.6Kb
JSC::Heap::allocateBlock (Collector.cpp:259) 256.0Kb
JSC::Identifier::add (Identifier.cpp:54) 42.7Kb

WebCore-other: 307.7Kb

WebCore::TextResourceDecoder::decode (TextResourceDecoder.cpp:818) 94.8Kb

WebCore-page: 92.9Kb
WebCore-css: 76.5Kb
WebCore-rendering: 23.7Kb

http://www.bbc.co.uk

Total: 10.2Mb

WebKit: 4.4Mb
WebCore-other: 1.8Mb
WebCore::TextResourceDecoder::decode (TextResourceDecoder.cpp:818) 911.7Kb
WebCore::TextResourceDecoder::decode (TextResourceDecoder.cpp:826) 398.4Kb
WebCore::ResourceLoader::addData (ResourceLoader.cpp:185) 390.1Kb

JavaScriptCore: 1.6Mb

JSC::Heap::allocateBlock (Collector.cpp:259) 512.0Kb
JSC::BytecodeGenerator::generate (BytecodeGenerator.cpp:163) 184.2Kb
JSC::Identifier::add (Identifier.cpp:54) 116.4Kb

WebCore-page: 563.4Kb

WebCore::EventTarget::addEventListener (EventTarget.cpp:175) 145.0Kb
WebCore::HTMLTokenizer::enlargeScriptBuffer (HTMLTokenizer.cpp:1996) 117.7Kb

WebCore-rendering: 434.0Kb

WebCore::RenderBlock::layoutInlineChildren (RenderBlockLineLayout.cpp:858) 258.3Kb

WebCore-css: 415.4Kb

WebCore::CSSParser::setupParser (CSSParser.cpp:224) 132.8Kb

Qt: 4.4Mb

Qt-gui: 3.3Mb
QFreetypeFace::getFace (qfontengine_ft.cpp:238) 2.0Mb
QImageData::create (qimage.cpp:242) 808.9Kb

Qt-corelib: 637.6Kb

QIODevice::read (qiodevice.cpp:943) 352.0Kb

Qt-network: 567.7Kb
Qt-other: 199.5Kb

QGifHandler::QGifHandler (qgifhandler.cpp:752) 193.1Kb

libs: 2.0Mb

http://maps.google.com

Total: 9.0Mb

WebKit: 6.1Mb
JavaScriptCore: 3.9Mb
JSC::Heap::allocateBlock (Collector.cpp:259) 1024.0Kb
JSC::BytecodeGenerator::generate (BytecodeGenerator.cpp:163) 620.8Kb
JSC::ParserArena::allocateFreeablePool (390.6Kb) ParserArena.cpp:104
JSC::Identifier::add (Identifier.cpp:54) 281.8Kb

WebCore-other: 2.3Mb

WebCore::TextResourceDecoder::decode (TextResourceDecoder.cpp:818) 1.5Mb
WebCore::SharedBuffer::SharedBuffer (SharedBuffer.cpp:39) 274.5Kb

WebCore-page: 603.6Kb

WebCore::HTMLTokenizer::enlargeScriptBuffer (HTMLTokenizer.cpp:1996) 160.6Kb

WebCore-css: 302.8Kb

WebCore::CSSParser::setupParser (CSSParser.cpp:199) 80.4Kb

WebCore-rendering: 148.5Kb

libs: 1.9Mb
Qt: 1.4Mb

Qt-gui: 1.1Mb
QFreetypeFace::getFace (qfontengine_ft.cpp:238) 669.8Kb
QX11PixmapData::fromImage (qpixmap_x11.cpp:648) 256.0Kb

Qt-corelib: 367.8Kb

locale_encode (qfile.cpp:66) 98.1Kb

Qt-network: 209.9Kb

http://sourceforge.net

Total: 18.3Mb

libs: 9.8Mb
XGetImage (libX11.so.6.2.0) 4.0Mb
libxcb.so.1.0.0 3.9Mb
Both of them called from: QX11PixmapData::toImage (qpixmap_x11.cpp:1475)

Qt: 9.1Mb

Qt-gui: 8.5Mb
QX11PixmapData::fromImage (qpixmap_x11.cpp:648) 6.2Mb
QImageData::create (qimage.cpp:242) 5.3Mb

Qt-corelib: 679.9Kb

QIODevice::read (qiodevice.cpp:943) 320.0Kb

Qt-network: 423.6Kb
Qt-other: 97.1Kb

WebKit: 7.5Mb

JavaScriptCore: 3.5Mb
JSC::Heap::allocateBlock (Collector.cpp:259) 1024.0Kb
JSC::Structure::copyPropertyTable (Structure.cpp:647) 422.0Kb
JSC::BytecodeGenerator::generate (BytecodeGenerator.cpp:163) 374.0Kb
JSC::Interpreter::execute (Interpreter.cpp:681) 316.5Kb

WebCore-other: 3.4Mb

WebCore::TextResourceDecoder::decode (TextResourceDecoder.cpp:818) 1.9Mb
WebCore::CachedScriptSourceProvider::length (CachedScriptSourceProvider.h:48) 687.9Kb
WebCore::CachedScriptSourceProvider::data (CachedScriptSourceProvider.h:47) 657.5Kb

WebCore-page: 969.7Kb

WebCore::EventTarget::addEventListener (EventTarget.cpp:175) 240.0Kb
WebCore::HTMLTokenizer::enlargeScriptBuffer (HTMLTokenizer.cpp:1996) 232.3Kb

WebCore-css: 514.5Kb

WebCore::CSSParser::setupParser (CSSParser.cpp:224) 159.0Kb

WebCore-rendering: 222.0Kb

www.facebook.com

Total: 11.7Mb

Qt: 6.9Mb
Qt-gui: 6.6Mb
QImageData::create (qimage.cpp:242) 2.9Mb
QFreetypeFace::getFace (qfontengine_ft.cpp:238) 2.0Mb
QX11PixmapData::fromImage (qpixmap_x11.cpp:648) 1.8Mb

Qt-corelib: 436.5Kb

QIODevice::read (qiodevice.cpp:932) 155.2Kb
QIODevice::read (qiodevice.cpp:943) 128.0Kb

Qt-network: 384.2Kb

QHttpNetworkReplyPrivate::gunzipBodyPartially (qhttpnetworkreply.cpp:402) 341.2Kb

Qt-other: 69.8Kb

WebKit: 4.1Mb

WebCore-other: 2.2Mb
WebCore::TextResourceDecoder::decode (TextResourceDecoder.cpp:818) 2.2Mb
WebCore::SharedBuffer::SharedBuffer (SharedBuffer.cpp:39) 764.4Kb

JavaScriptCore: 1.6Mb

JSC::Heap::allocateBlock (Collector.cpp:259) 512.0Kb
JSC::Identifier::add (Identifier.cpp:54) 218.5Kb

WebCore-css: 638.0Kb

cssyyparse (CSSGrammar.y:798) 171.7Kb

WebCore-page: 254.1Kb
WebCore-rendering: 44.7Kb

libs: 1.8Mb

Side story:

During the measurement, the guys here replaced my Qt 4.5.2 to 4.6.0. (Caused me a lot of trouble... grrr) However, it turns out that the memory consumption of Qt 4.6.0 improved a lot compared to 4.5.2 (especially the network and gif handling).

www.google.com: 2.5Mb decreased to 1.1Mb in 4.6.0 (Total: 3.8Mb from 5.6Mb)
www.bbc.co.uk: 6.5Mb decreased to 4.4Mb (Total: 10.2Mb from 12.9Mb)

The freya configuration file is attached to this post.