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Asked: 2026-06-09T23:05:03+00:00

I suspect my app is creating lots of threads using dispatch_async() calls. I’ve seen

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I suspect my app is creating lots of threads using dispatch_async() calls. I’ve seen crash reports with north of 50 and 80 threads. It’s a large code base I didn’t write and haven’t fully dissected. What I would like to do is get a profile of our thread usage; how many threads we’re creating, when we’re creating them, etc.

My goal is to figure out of we are spending all of our time swapping threads and if using an NSOperationQueue would be better so we have more control than we do by just dispatch_async’ing blocks all over willy-nilly.

Any ideas / techniques for investigating this are welcome.

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1 Answer

  1. Editorial Team

    Looks like you need to take a look at Instruments. Learn about it from Apple docs or WWDC sessions or wherever you want. There are many resources

    Generally NSOperationQueues are definitely better if you need to implement some dependicies.

    As Brad Llarson pointed there are a few WWDC sessions which are helpful in many cases. However besides optimizing your calls you should consider making your code more human readable and simply better. I haven’t ever seen source code with as many as 80 queues on iOS. There must be something wrong with the architecture of app.

    Let me know anyone if I am wrong.

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