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I know this question is more on OS than on programming,sorry for that.
In a multiprogrammig scheme with variable partitions
who has to decide the size of a process virtual address space??
what if during execution we find out a process needs more memory??
With variable partition scheme I mean a scheme that does not involve segmentation or paging
but countigous allocation.
Do you mean something without Virtual Memory? Systems without MMU give a fixed space to each process, even the maximum stack size is encoded in the binary file format, see the bFLT format for an example.