UGC NET CSE | December 2008 | Part 2 | Question: 42

Question

If the executing program size is greater than the existing $RAM$ of a computer, it is still possible to execute the program if the $OS$ supports :

• A. multitasking                       
• B. virtual memory   
• C. paging system       
• D. none of the above

Answer 1

Option B
Virtual Memory is designed to extend the limited physical memory.

• If a computer has 32-bit address length that means "each process" has its individual $2^{32} -1$ address space (around 4GB) but as we have only limited physical memory we can't fulfill this demand of all processes so we use Virtual memory in combination with Page + segmentation File system, so that process is divided into smaller unit and as all of these units are not required at a time, only the required once can be brought in the main memory.

• By using this technique we can keep thousand of process in our Main Memory simultaneously.

Comments

Possible if supports virtual memory concept