ios - Different behaviour for allocations instruments (with and without zombie-mode) -


i'm struggling memory management in ios or more precisely monitoring complex memory usages.

so i'm wondering allocations instrument provided once in zombie-mode (when i'm looking zombies) , in general "normal" allocations instrument (chosable memory->allocations).

if i'm searching zombies allocations instrument shows me different numbers of storage allocated @ moment (live bytes). every click on ui live bytes increasing lot.

but in normal allocations window (memory->allocations) seems (almost absolutely) fine. so, 1,13 mb of live bytes allocated, maximum of allocated bytes in contrast description above can reach 4-5 mb clicks on ui. seems weird me.

is there more count in zombies->allocations not regarded in normal allocations-window?

note: there no zombies , leaks in program.

as far understand zombies feature, seen mutually exclusive leaks , object allocation in instruments.

in fact, when enable zombies (instruments or nszombies directive), happens "normal" retain cycle of objects tricked can detect attempt @ using object has been deallocated. in sense, don't know details it, if retain count incremented one, , error attempt @ using deallocated instance, when retain count goes 1. indeed, if retain count go zero, object deallocated , in cases impossible detect attempt @ reuse, since can happen long time after deallocation , chunk of memory have been reallocated other object. artificial increment of retain count serve allow object survive "would be" deallocation; when retain count goes 1, flag set in object runtime knows attempting send message "would be" deallocated object, , full error message.

this mental model of it, allows me explain why memory allocation higher when zombies enabled (i.e., because objects not deallocated in normal case).


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