NSOperation Efficiency
NSOperation Efficiency
- Subject: NSOperation Efficiency
- From: "Gerriet M. Denkmann" <email@hidden>
- Date: Wed, 05 Dec 2012 01:15:11 +0700
I have an app which uses NSOperations inside an NSOperationQueue. These operations do not do any I/O - just Cpu. No swapping is taking place.
When I set [ self.operationQueue setMaxConcurrentOperationCount: 1 ] each operation takes on average 200 msec., measured by NSDate.
With 2 concurrent operations, it takes not 100 msec but 110 - an extra 10%. Ok - some overhead is to be expected.
With 4 ops it takes 70 instead of 50 - overhead 40% - rather a lot.
With 8 ops it takes 60 instead of 25 - overhead 140%. or: 40% of the cpu is used by my operations, 60% is used by whom? And for what?
Is this to be expected? Or does my app has some hidden flaws? If so, where should I start looking?
Gerriet.
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