Re: [Qt-qml] QML memory usage with import QtWebKit
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: qt-qml-boun...@trolltech.com [mailto:qt-qml-boun...@trolltech.com] On
Behalf Of ext Gregory Schlomoff
Sent: Tuesday, December 14, 2010 4:52 PM
To: Brasser Michael (Nokia-MS-Qt/Brisbane)
Cc: qt-qml@trolltech.com
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,
michael.bras...@nokia.commailto:michael.bras...@nokia.com 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,
michael.bras...@nokia.commailto:michael.bras...@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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Re: [Qt-qml] QML memory usage with import QtWebKit
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.bras...@nokia.commailto:michael.bras...@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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Re: [Qt-qml] QML memory usage with import QtWebKit
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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Re: [Qt-qml] QML memory usage with import QtWebKit
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.)
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.bras...@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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