How do games like GTA IV not fragment the heap?

Question

I\'m interested in the type of memory management a game like GTA IV might use given that it needs to create and delete lots of objects very quickly. How do the avoid fragmenting

Answer 1

I think because their objects are mostly of the same size they can use some internal memory manager which doesn't actually free memory, but marks it as available and next time chunk of ~size is allocated it returns it.