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The document discusses the concept of Virtual Memory (VM) in computer systems, highlighting its motivations such as using physical DRAM as a cache for disk storage, simplifying memory management for multiple processes, and providing protection between processes. It explains how VM allows processes to exceed physical memory limits by utilizing disk space and describes the mechanisms of address translation, page tables, and handling page faults. The document also contrasts traditional memory management with modern approaches like those used in MAC OS X, emphasizing the importance of protection and efficient memory allocation.

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What are the components of virtual memory?

Virtual memory combines active RAM and inactive memory on DASD to form a large range of contiguous addresses. The computers operating system, using a combination of hardware and software, maps memory addresses used by a program, called virtual addresses, into physical addresses in computer memory.

What is the virtual address?

A virtual address is a memory address that is generated by the operating system and presented to a program as if it were the actual physical address in the computers main memory (RAM). Its essentially a pretend address that makes it easier for the computer to manage memory and keep track of the programs data.

What is the difference between logical address and virtual memory?

Logical addresses are part of the virtual memory abstraction, which allows programs to operate in a larger logical address space than the available physical memory. A logical address must be mapped or translated to its corresponding physical addresses before the hardware can use it.

What is a virtual address and a physical address?

Physical addresses refer to hardware addresses of physical memory. Virtual addresses refer to the virtual store viewed by the process. virtual addresses might be the same as physical addresses.

What is the difference between RAM and address space?

A computers address space is the total amount of memory that can be addressed by the computer. The term may refer to the physical memory (RAM chips) or virtual memory (disk/SSD). For example, a 32-bit computer can address 4GB of physical memory and as much as 64TB of virtual memory.

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Is virtual RAM the same as virtual memory?

Virtual memory and physical memory serve distinct roles in a computer system. Physical memory (RAM) is the actual hardware that provides temporary storage for active data, while virtual memory is a reserved space on the storage device (usually a hard drive or SSD) used when physical memory is exhausted.

What is the difference between virtual address and virtual memory?

Virtual address space is the maximum amount of address space available to an application, which depends on architecture, e.g. CPU register size. Virtual memory enables each process to have its own unique view of a computers memory.

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