On 2010-10-22, at 1:32 PM, Graham Cox wrote: > On 22/10/2010, at 2:19 PM, Abhi Beckert wrote: > >> How much does performance/memory suffer from using >> filteredArrayUsingPredicate? > > You state it doesn't matter, then you worry that it might. > > With any question about optimisation, the question can only be answered by > measuring the performance to see if it falls short of your requirements or > not. Since you don't say what your requirements are and have not measured the > performance against them, nobody can answer this.
I should clarify I did test the performance in this case, and it's pretty much instant. But I want to make educated guesses about fetch techniques in future, rather than spend precious billable time testing every single case, only to find out I need to spend three hours refactoring my code. I've been doing things like this in PHP/MySQL for years and am used to knowing, before I write the code, what technique will deliver "good enough" performance while minimising bugs (optimisation is the root of all evil!). We've only recently started offering cocoa programming to our clients. > All I will say is that on Mac (as opposed to iOS) filtering using a predicate > is "fast enough" up to many thousands of objects and I've found it adequate > for my needs, but YMMV. You'd probably be unable to match its performance by > doing the filtering yourself, though you could beat it by changing your > storage so that it is organised into sets that already match certain > criteria. Also, as you're caching the result you'll only get hit once or > whenever the predicate or content changes. Thanks, that pretty much answers my question. Thanks! :-) - Abhi_______________________________________________ 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
