On Tue, Aug 17, 2010 at 3:10 AM, Stuart Rogers <stuart.rog...@me.com> wrote: > I'm having enormous difficulty keeping tabs on memory usage in my current > project. I'm happy that I'm not leaking anything - Build & Analyse reports no > issues, and neither does Instruments (Object Allocations and Leaks). And yet, > when watching bulk memory usage I see my free RAM dropping like a stone > (at the expense of my inactive RAM) and within seconds it has chewed through > 8GB and starts kicking off extra page files. The active RAM usage is fairly > modest, and nearer to what I would expect.
When you say "free" I assume you mean the "free:" number listed in activity viewer for the system as a whole? (sounds like you know this already but...) If so then what you are seeing is an expected result of the "unified buffer cache" maintained by the system (since you say private memory of your application doesn't increase). In a nut shell unused RAM is wasted RAM so the system always attempts to cache once used pages of memory (for example file data loaded by your application) as long as possible until they need to be reused for active / new allocations. So in general you shouldn't worry about free RAM shrinking to a sliver of total system RAM over time... however if your application loads file data (aka image data in your case) only once or it is unlikely your application will load the same file data again in the reasonable near future then you should look at disabling file caching of the file data you load. Review... http://developer.apple.com/mac/library/documentation/Performance/Conceptual/FileSystem/Articles/FilePerformance.html#//apple_ref/doc/uid/20001987-99732 I don't think "kCGImageSourceShouldCache" affects caching at the file system cache level, it only enables/disables cacheing of decoded image data (aka raw pixels instead of source jpeg data). To avoid file caching you may have to load file data in a different way... I would consider asking this question on the quartz developer list. -Shawn _______________________________________________ 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
