StackOverflow上有人做了一些简单的测试，有限设备下迄今为止测到的结果：

iPad1: 127MB/256MB/49% (大致crash临界值 / 总内存 / 占比) 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) 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)

来自StackOverflow上面的回答： iphone - ios app maximum memory budget@TOC

转自stevenwuzheng博客