Answer Posted / gyanendra pratap singh

hi
virtual memory is depend upon your processor if u r using
32 bit of processor the n we can addressed the 2 to the
power 32 adresses which is 4GB space . suppose u have 1 GB
of RAM then u addressed 1.5 virtual memory if u want to
maintain ur system performance , bcz if u assign whole 4 GB
address space then ur pc performance becomes slow , why bcz
memory of ram in mainly consist of two parts one is in
which process executed and one in which we make the virtual
page pages in secondry memory , which is called paging , if
u assign all the memory for paging then process space
memory is become less because of less memory is process
space too much swaping of processes is occurred so system
performance becomes low..

In one word virtual memory is present in secondry memory
(hard disk) which is mapped by the ram presented in the
system , because of it virtual memory is faster than
secondry memory and slower than RAM .
If the O S did not have that concept , the large memory
size process executing slowly and two much swapping iis
done by the O S ..

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