[Qt-qml] QML memory usage with "import QtWebKit"

[michael.brasser at nokia.com]

Hi Greg,

On 10/12/2010, at 4:52 PM, ext Gregory Schlomoff wrote:

Hi Michael,

Somme additional figures:

1. Empty Rectangle, not importing QtWebkit: ~ 3MB
2. Empty Rectangle, importing QtWebkit: ~ 13MB
3. Rectangle with an empty WebView: ~ 14 MB
4. Setting url: "about:blank" in the WebView: ~15 MB
5. Setting url: "http://www.google.com/": ~19 MB (and a repaint bug: webview displays a checkered background, and I have to resize the window a little bit to make it actually paint the page.)

Okay, thanks for sharing these. They are in the ballpark of what I would have expected based on prior observation, though I am definitely not a webkit expert. If you want to dig more, you could try comparing with QWebView or QGraphicsWebView (QML WebView memory usage should be identical to QGraphicsWebView with QWebSettings::TiledBackingStoreEnabled set (which does increase memory usage because of the pixmap caching)). Maybe someone familiar with QtWebKit can provide more information, or say whether there are any ways to tweak the memory usage?

You can track the repaint bug (I think they are the same) at https://bugs.webkit.org/show_bug.cgi?id=50222.

Regards,
Michael

All tests on windows 7 64-bits, running qmlviewer.exe built from the 4.7.0 branch on Oct, 6.

Thanks,

Greg

On Fri, Dec 10, 2010 at 12:12 PM, <michael.brasser at nokia.com<mailto:michael.brasser at nokia.com>> wrote:
Hi Greg,

>From what I remember 10MB for the "base" usage of webkit sounds about right, though I didn't realize that just an import statement would add this cost. Did you try any other configurations? e.g. did adding an empty WebView cause the memory to go up or was it still around 13MB?

Regards,
Michael

On 30/11/2010, at 6:48 PM, ext Gregory Schlomoff wrote:

> Hello,
>
> One simple observation. Launching the following code in qmlviewer.exe,
> I get a memory usage of aroung 3 megabytes:
> -----------------------
> import QtQuick 1.0
>
> Rectangle {
>       width: 200
>       height: 200
> }
> ------------------------
>
> Now, with the following code, memory usage jumps to 13 megabytes. I'm
> not instantiating any WebView element, just importing QtWebkit.
> -----------------------
> import QtQuick 1.0
> import QtWebKit 1.0
>
> Rectangle {
>       width: 200
>       height: 200
> }
> ------------------------
>
> Is that normal? Would someone care to explain what the import
> statement is doing that is adding 10 mb of memory consumption?
>
> Thanks
>
> Greg
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