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Does iOs use non-contiguous or contiguous allocation in memory management? suppose if user allocates more than 128 MB, Will the App be closed? or Memory will be managed by iOS as if user allocates memory and misses deallocate in Deallocate method? is it possible to use more than 120 MB in application using well-defined data structure allocation?
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So try to stay under 100mb if you want to run on devices with 512mb total ram. Remember, this is for the gpu and cpu combined.
Memory management in iOS was initially non-ARC (Automatic Reference Counting), where we have to retain and release the objects. Now, it supports ARC and we don't have to retain and release the objects. Xcode takes care of the job automatically in compile time.
Beta versions of iOS 15 and iPadOS 15 now give developers the option of requesting more RAM than the current 5GB maximum per app, with limitations. Apple has always set a cap on how much RAM any one app can use on the iPad, but it's become more of an issue as the devices themselves physically include more.
You can use memory < your device ram capacity
(e.g. you're using 40 Mb of RAM, and then allocating 80 Mb's more for some short computation). In this case iOS would kill your application immediately.1
List of results found by users testing with this tool:
device: (crash amount/total amount/percentage of total)2
- iPad1: 127MB/256MB/49%
- iPad2: 275MB/512MB/53%
- iPad3: 645MB/1024MB/62%
- iPad4: 585MB/1024MB/57% (iOS 8.1)
- iPad Mini 1st Generation: 297MB/512MB/58%
- iPad Mini retina: 696MB/1024MB/68% (iOS 7.1)
- iPad Air: 697MB/1024MB/68%
- iPad Air 2: 1195MB/2048MB/58% (iOS 8.x)
- iPad Pro 12.9: 3064MB/3981MB/77% (iOS 9.3.2)
- iPad Pro 9.7": 1395MB/1971MB/71% (iOS 10.0.2 (14A456))
- iPod touch 4th gen: 130MB/256MB/51% (iOS 6.1.1)
- iPod touch 5th gen: 286MB/512MB/56% (iOS 7.0)
- iPhone4: 325MB/512MB/63%
- iPhone4S: 286MB/512MB/56%
- iPhone5: 645MB/1024MB/62%
- iPhone5S: 646MB/1024MB/63%
- iPhone6: 645MB/1024MB/62% (iOS 8.x)
- iPhone6+: 645MB/1024MB/62% (iOS 8.x)
- iPhone6s: 1396MB/2048MB/68% (iOS 9.2)
- iPhone6s+: 1195MB/2048MB/58% (theoretical, untested)
- iPhoneSE: 1395MB/2048MB/69% (iOS 9.3)
- iPhone 6s+: 1392MB/2048MB/ 68% (iOS 10.2.1)
- iPhone 7+: 2040MB/3072MB/66% (iOS 10.2.1)
- iPhone X: 1392/2785/50% (iOS 11.2.1)
1https://stackoverflow.com/a/5887783/5181636
2https://stackoverflow.com/a/15200855/5181636
More information can be found on this question.
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