On May 1, 2015, at 00:08:33, Graham Cox <graham....@bigpond.com> wrote:
> 
> Well, it’s always gratifying to find I’m not alone ;)
> 
> How did you figure out a value that leaves one for the main thread? The 
> actual value returned is -1 for 
> NSOperationQueueDefaultMaxConcurrentOperationCount, not the actual number it 
> calculated. I guess there’s a way to get the number of cores, but that isn’t 
> necessarily the whole story…?

I just dinked around until I found something that worked for my app (which can 
create many more ops than there are cores). I ended up with:

const NSUInteger                numCores = [[NSProcessInfo processInfo] 
processorCount] * 2 - 1;

[self.searchQueue setMaxConcurrentOperationCount:(NSInteger)numCores];

--
Steve Mills
Drummer, Mac geek


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