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Garbage Collection: Algorithms for Automatic Dynamic Memory Management Rafael D Lins, Richard Jones
Publisher: Wiley

Before going to the details, let's briefly .. Java (and dominating majority of other modern languages) features automatic memory management aka garbage collection. Old space is still collected by one thread. There is no actual allocation or deallocation going on: the space in the automatic memory (AKA "on the stack") is allocated by some compile-time bookkeeping around the stack pointer. The Duetto One of the primary benefits of emscripten's model is that it eliminates garbage collection pauses by using the fixed-size heap and performing no other allocations. Since are using a selector to call a method dynamically at runtime, ARC doesn't really know if the method called returns a +1 retained object or a auto-released object. The access of automatic variables is a very fast assisted by hardware, so there is no loss of efficiency there. The compiler will split the code automatically in the client part (compiled to JavaScript) and server part (compiled to native code). If any of this was hard to understand (especially for lack of diagrams), I strongly recommend reading Garbage Collection: Algorithms for Automatic Dynamic Memory Management by Richard Jones and Rafael Lins. Compiler level feature; Also a run time Memory management can be broadly classified into two, garbage collected and reference counted models. These are not garbage collected - you need to explicitly free every pointer that you allocated. This is a special mode of parallel scavenge collector in which it can dynamically adjust configuration of young space to adapt for an application. Once instance of object becomes Parallel scavenge GC mode is using parallel implementation of young collection algorithm. Garbage collection; Reference Counting; Automatic Reference Counting. How does Dynamic memory management is slow also when programming native code and should be avoided when performance is the critical factor. Dynamic memory allocation (Java-style) is done with malloc / calloc / realloc in C.