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POHow Process Size is determined?
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copied!<p>I am very new to these concepts but I want to ask you all a question that is very basic I think, but I am confused, So I am asking it. The question is... How is the size of a process determined by the OS? Let me clear it first, suppose that I have written a C program and I want to know that how much memory it is going to take, how can I determine it? secondly I know that there are many sections like code section, data section, BSS of a process. Now does the size of these are predetermined? secondly how the size of Stack and heap are determined. does the size of stack and heap also matters while the Total size of process is calculated.</p> <p>Again we say that when we load the program , an address space is given to the process ( that is done by base and limit register and controlled by MMU, I guess) and when the process tries to access a memory location that is not in its address space we get segmentation fault. How is it possible for a process to access a memory that is not in its address space. According to my understanding when some buffer overflows happens then the address gets corrupted. Now when the process wants to access the corrupted location then we get the segmentation fault. Is there any other way of Address violation.</p> <p>and thirdly why the stack grows downward and heap upwards.Is this process is same with all the OS. How does it affects the performance.why can't we have it in other way?</p> <p>Please correct me, if I am wrong in any of the statement.</p> <p>Thanks Sohrab</p>

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