For the past 2 months of development, I've followed the android performance guidelines here - http://developer.android.com/guide/practices/design/performance.html - to the tee.
I always cache field lookups if the field is referenced more than once in a method. I was under the assumption that since the local variable is simply a pointer to the field, that it will be on the stack and will not need to be "cleaned" up, just like a local variable that is a primitive. Is this correct? I'm very, very careful not to not allocate, that is, declare new objects in my main loop. With that said, I'm having a problem where I'm having about 54200 objects GCed every 55 seconds while the game is running. That translates to about 1000 objects per second, or at 60FPS (which my game runs at on the emulator), about 16 short-life objects per loop. I have absolutely scoured my code to make sure that I'm not creating anything. I must be missing something though. Here are my questions: 1) Are local variables ever affected by GC if they never call new, either explicitly or implicitly? -- I'm asking if I have a field that is "private ArrayList<Dog> dogList;" and in my method, I say "ArrayList<Dog> dogList = this.dogList;" - that doesn't have any impact on GC, correct? It's just a pointer on the stack, right? -- I understand that the word "new" doesn't need to be obvious because really any method can create something new and return it. 2) What about local variable arrays? Do those go in the heap (short lived, GC) or on the stack? 3) I did an hprof dump but it's not giving me the information I need. I'd really like to profile what is being GCed so I can figure out what's being allocated 16 times per tick. Thanks for all your help! --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
