iOS单个应用程序的最大可用内存是多少？

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)