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Virtual Memory Management Techniques

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Questions and Answers

What is the benefit of virtual memory for programmers?

Programmers no longer need to worry about the amount of physical memory available.

Define the virtual address space of a process.

The logical (or virtual) view of how a process is stored in memory.

What is demand paging?

A technique where pages are loaded into memory only when they are demanded during program execution.

What is the difference between a swapper and a pager in the context of demand paging?

A swapper manipulates entire processes, whereas a pager is concerned with individual pages of a process. Signup and view all the answers

Why is a lazy swapper used in demand-paging systems?

A lazy swapper only swaps a page into memory if that page will be needed. Signup and view all the answers

Explain the concept of separating logical memory from physical memory in virtual memory systems.

Virtual memory involves the separation of logical memory as perceived by users from physical memory. Signup and view all the answers

Why is one major advantage of virtual memory that programs can be larger than physical memory?

Programs can be larger than physical memory because virtual memory allows the execution of processes that are not completely in memory. Signup and view all the answers

What is the basic requirement that necessitates memory-management algorithms?

The basic requirement is that instructions being executed must be in physical memory. Signup and view all the answers

Why is the requirement that instructions must be in physical memory both necessary and unfortunate?

It is necessary for execution but unfortunate because it limits the size of a program to the size of physical memory. Signup and view all the answers

What are some examples of parts of a program that may not be needed during execution?

Some examples include error handling code for rare conditions, allocated memory that is never fully used, and certain program features that are rarely utilized. Signup and view all the answers

What are the benefits of being able to execute a program that is only partially in memory?

The benefits include not being constrained by physical memory size, allowing for extremely large virtual address spaces, and simplifying the programming task. Signup and view all the answers

How does virtual memory enable larger programs to be executed on a system?

Virtual memory allows programs to be partially stored on secondary storage, loading only necessary parts into physical memory when required. Signup and view all the answers

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