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Virtual Memory & Demand Paging Video Lecture | Question Bank for GATE Computer Science Engineering - Computer Science Engineering (CSE)
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FAQs on Virtual Memory & Demand Paging Video Lecture - Question Bank for GATE Computer Science Engineering - Computer Science Engineering (CSE)
| 1. What is virtual memory? |  |
Ans. Virtual memory is a computer memory management technique that allows the operating system to use secondary storage, such as the hard disk, as an extension of the main memory. It creates an illusion of having more physical memory than is actually available, by temporarily transferring data between the RAM and the disk.
| 2. What is demand paging? | |
Ans. Demand paging is a memory management technique used in virtual memory systems. It allows the operating system to load data into memory only when it is demanded by a running process. This approach helps in reducing the amount of memory required to run programs, as only the necessary pages are loaded into memory.
| 3. How does virtual memory work? | |
Ans. Virtual memory works by dividing the virtual address space of a process into smaller units called pages. When a process requests data that is not currently in memory, a page fault occurs. The operating system then fetches the required page from the disk and loads it into a free frame in the physical memory. This process of swapping pages between disk and memory is transparent to the running process.
| 4. What are the advantages of virtual memory? | |
Ans. Virtual memory provides several advantages, including:
- Increased usable memory: It allows running programs that require more memory than is physically available.
- Memory protection: Each process has its own virtual address space, ensuring that one process cannot access or modify the data of another process.
- Efficient memory management: Virtual memory enables demand paging, which reduces the amount of memory needed to run programs, leading to efficient memory utilization.
- Simplified programming: Programmers can assume that they have access to a large address space, simplifying the programming process.
| 5. What happens when a page fault occurs in demand paging? | |
Ans. When a page fault occurs in demand paging, it means that the requested page is not currently present in the physical memory. The operating system then performs the following steps:
1. It checks if the page is on the disk or not.
2. If the page is on the disk, it reads the required page from the disk into a free frame in the physical memory.
3. If there are no free frames available, it selects a victim page to be replaced.
4. The selected victim page is written back to the disk if it was modified.
5. Finally, the required page is loaded from the disk into the newly freed frame, and the process continues execution.
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Dec 25, 2024 Last updated |
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