Adam,
Thank you very much for that link. It was extremely helpful, and
setting WebCacheModelDocumentViewer made the memory usage much
cleaner. At the end of the day, I was still unhappy with the amount of
memory WebKit was using in the application, so I decided to go a
different route. I created a subproject WebKitHelper background
application that I spin off using NSTask. That helper grabs the
favicon and renders the thumbnail, pipes them both back to the main
application, and then exits. Now, I don't have to worry about how much
memory is getting used, or when I can safely release the WebView, etc.
When I've got everything I need, WebKitHelper terminates, and I'm good
to go. If anyone is interested in that code, let me know, and I will
wrap it up and upload it somewhere.
On Jun 7, 2008, at 11:02 AM, Adam R. Maxwell wrote:
On Jun 7, 2008, at 6:26 AM, Timothy Ritchey wrote:
On Jun 7, 2008, at 1:32 AM, Adam R. Maxwell wrote:
From a quick check with Instruments, it looks like internal WebKit
stuff is retaining the view for callbacks even after it's done
loading, then releasing it on a later pass through the runloop. I
wouldn't worry about it unless you're actually leaking the object.
From what I can tell by watching several instrument runs, it seems
like WebKit is internally caching stuff. If I go to cnn.com, I see
a major memory bump, but I can go to it again and again and not see
any increase, but when I go to a new website, say digg.com, I see
another memory bump again. Even if I let the application run for a
while, it never seems to go back down. The only reason I am using
webkit is to grab these thumbnails, which happens once, and need to
be refreshed very rarely, if ever. I'm trying to read up on how to
alter the caching behavior of WebKit now.
Sounds like we have similar usage scenarios. You have to read the
header to find out about caching behavior, but I set it to
WebCacheModelDocumentViewer for lowest memory usage, since I draw
the webview to a bitmap and never load it again. I also set the
WebView prefs to disable plugins and other stuff as well; the code
is all BSD licensed, if you're curious.
http://tcobrowser.svn.sf.net/svnroot/tcobrowser/trunk/bibdesk/vendorsrc/amaxwell/FileView/FVWebViewIcon.m
--
Adam
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