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This question already has an answer here:
It is always being asked in interview how many maximum threads we can run in ios iphone programming simultaneously in NSOperationQueue and through GCD async?
Please explain the answer.
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You should be using
NSOperationQueueDefaultMaxConcurrentOperationCountwhen you create your operations to let the OS decide the maximum number of operations - it will decide this based on the hardware available and system resources. The number will of course vary depending on device.