On or about 1/24/09 10:17 AM, thus spake "jonat...@mugginsoft.com" <jonat...@mugginsoft.com>:
> I am also having horrible performance problems. > A data set of 1500 items with a total on disk size of 1.8MB is taking > more than 30 secs to load. > Maybe NSArrayController -fetchWithRequest will improve things. I would ask you the same question I just asked someone else on the list: are you using the XML persistent storage format? Because, if so, you must expect some delay, since even before you fetch any objects the entire XML file must be loaded into memory and parsed. I use XML because I want human readability for my data, so startup speed is a sacrifice I am prepared to make. My data consists of about 5000 items, but they are very simple; dealing with complex objects would take considerably longer, one assumes. In order to cave-man-instrument the startup procedure via NSLog, I do NOT prepare content or even bind my array controller's managed object content in the nib; instead, I do it all manually in awakeFromNib. Here are some NSLog timings: 2009-01-24 10:37:09.157 [788] awakening from nib 2009-01-24 10:37:09.269 [788] binding to MOC 2009-01-24 10:37:09.359 [788] creating whole shebang 2009-01-24 10:37:09.360 [788] adding persistent store 2009-01-24 10:37:13.877 [788] calling fetch 2009-01-24 10:37:14.192 [788] done calling fetch Notice the big delay between "adding persistent store" and "calling fetch"; that consists a single line of code (calling addPersistentStoreWithType:). So the delay there is nothing but the XML file being loaded and parsed. m. -- matt neuburg, phd = m...@tidbits.com, http://www.tidbits.com/matt/ pantes anthropoi tou eidenai oregontai phusei Among the 2007 MacTech Top 25, http://tinyurl.com/2rh4pf AppleScript: the Definitive Guide, http://tinyurl.com/2ouo3b Take Control of Customizing Leopard, http://tinyurl.com/2t9629 TidBITS, Mac news and reviews since 1990, http://www.tidbits.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
