[webkit-qt] FW: Memory Consumption Qt4 vs Qt5 / bug reporting

Tue Jan 8 00:14:37 PST 2013

https://bugs.webkit.org/show_bug.cgi?id=106304

I filed a bug report for this Memory Consumption problem with a detailed description, test program and test page.

I also experienced much, much higher CPU loads for CSS animations with Qt5, for which I also filed a bug (106309).

Right now these two bugs a real stoppers for us to go on with Qt5 (sigh...). Anyway, if these two bugs are closed, how can I see which Qt version will include the patches? Is there any documentation on how WebKit/QtWebKit bugs a closed and included afterwards in a Qt release?

Thanks,
Eike

From: webkit-qt-bounces at lists.webkit.org [mailto:webkit-qt-bounces at lists.webkit.org] On Behalf Of Rethmeier, Eike
Sent: Wednesday, January 02, 2013 12:41 PM
To: Simon.Hausmann at digia.com
Cc: webkit-qt at lists.webkit.org
Subject: Re: [webkit-qt] Memory Consumption Qt4 vs Qt5

@Pierre: That's a question I myself can not answer. There's just too much 'in-depth' knowledge neccessary.

@Simon: "Do you produce the numbers you posted with your little test app, meaning just starting and showing the window already gets you to 24 mb?" Yes. I just retested the stuff several times with Qt5 final, and the numbers are 25-29 MB (just starting and showing) while 4.8.4 takes 6-7 MB. After sending data with the Qt5 build (ie using the JS bridge), the memory consumption grew up to 53 MB, then 79MB, then 82 MB, then it did not increase anymore. With 4.8.4 the memory consumption just increased to 8-9 MB.

Shall I post a bugzilla issue for this?

From: Pierre Rossi [mailto:pierre.rossi at gmail.com]
Sent: Wednesday, December 19, 2012 11:42 PM
To: Hausmann Simon
Cc: Rethmeier, Eike; webkit-qt at lists.webkit.org<mailto:webkit-qt at lists.webkit.org>
Subject: Re: [webkit-qt] Memory Consumption Qt4 vs Qt5

Hi all,

Could it be another side-effect of the infamous https://bugs.webkit.org/show_bug.cgi?id=104135 ?

Pierre

On Wed, Dec 19, 2012 at 9:19 PM, Hausmann Simon <Simon.Hausmann at digia.com<mailto:Simon.Hausmann at digia.com>> wrote:

Hi,

I have the feeling that the increased memory consumption during bridge use might be the result of us making more use of the GC heap for temporaries. Triggering GC manually would be one way of testing that.

Regarding the regular memory usage I'm very surprised. Do you produce the numbers you posted with your little test app, meaning just starting and showing the window already gets you to 24 mb?

(I haven't made the time yet to try to reproduce that but I'll try soon under Linux)

Simon

"Rethmeier, Eike" <eike.rethmeier at wincor-nixdorf.com<mailto:eike.rethmeier at wincor-nixdorf.com>> wrote:

Hi,
[ Win7 and WinXP, Visual Studio 2010 ]

I just saw that QtWebKit in Qt5 RC2 let the memory consumption increase by factor 3 (7MB to approx. 24 MB). When doing some testing with the JS bridge (sending data from JS to C++ ) the memory consumption in Qt5 even grew up to a factor of 6 or 7 (step by step to approx 45MB, and it did not go down anymore), while in Qt4 there was almost no memory increase (finally 8 or 9MB).
I used my very simple test program which  I attached at bug https://bugs.webkit.org/show_bug.cgi?id=104540

Did you also experience such a high memory consumption?
Eike

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