Hello Warwick I just want to clarify something that maybe wasn't clear from my original mail:
I'm sharing those numbers not because I think they are somehow too high, or too low, but because I am surprised to see memory usage *grow by a significant amount* even when I'm *not instantiating* anything. Put it another way: the fact that a single "import WebKit 1.0" line adds 10 MB of memory usage, even though I'm NOT instantiating any WebView element is an unexpected behaviour to me, and may indicate either a bug with the way QML deals with imports, or a normal but unexpected behavior that should be explained / documented. Thanks Greg On Wed, Dec 15, 2010 at 8:51 AM, <[email protected]> wrote: > “Memory usage” is not a simple integer. If those numbers are mainly > shared read-only code pages it’s perfectly normal and you may shrug and move > on, if they’re for every application using webkit that would be unexpected. > > > > But in general, don’t expect a web runtime to somehow be small just because > it happens to be instantiated from QML. Doing HTML from QML is no better an > idea than doing it all in a regular web browser. > > > > -- > > Warwick > > > > *From:* [email protected] [mailto:[email protected]] > *On Behalf Of *ext Gregory Schlomoff > *Sent:* Tuesday, December 14, 2010 4:52 PM > *To:* Brasser Michael (Nokia-MS-Qt/Brisbane) > *Cc:* [email protected] > *Subject:* Re: [Qt-qml] QML memory usage with "import QtWebKit" > > > > Hi Michael, > > > > Sorry, I didn't understand from your email if you think it's normal that > memory usage goes up 10 Mb by just importing WebKit without using it ? > > > > What I mean is: does it look like an issue that should be investigated, or > should we just shrug and move on? > > > > :) > > > > Thanks > > > > Greg > > On Tue, Dec 14, 2010 at 12:52 PM, <[email protected]> wrote: > > 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, <[email protected]> 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 > > > _______________________________________________ > > Qt-qml mailing list > > [email protected] > > http://lists.trolltech.com/mailman/listinfo/qt-qml > > > > > > >
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