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Function Allocation. Function allocation (also known as task allocation) is a classic human factors method for deciding whether a particular function will be accomplished by a person, technology (hardware or software) or some mix of person and technology.
Heap allocation involves switching from user to kernel to allocate memory on heap as memory allocation is the function of OS. Hence, it is slower than static memory allocation as static memory allocation does not need this switching as kernel already allocate sufficient memory before giving control to user. Heap allocation is dynamic in nature and can be used to allocate variable amount of memory. Useful where memory can be large and not known in the advanced.