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Virtual memory is a memory management technique that creates the illusion of a large main memory by using a combination of hardware and software. Learn how virtual memory works, its benefits, and its origins from the Atlas Computer to modern operating systems.
OpenVMS, often referred to as just VMS, [9] is a multi-user, multiprocessing and virtual memory-based operating system.It is designed to support time-sharing, batch processing, transaction processing and workstation applications. [10]
A page table is a data structure that maps virtual addresses to physical addresses in a computer. It is used by the operating system to access data in memory and handle page faults, page replacement, and other operations.
A page is a fixed-length block of virtual memory, the smallest unit of data for memory management in an operating system. Learn about page size, page table, TLB, internal fragmentation, disk access and multiple page sizes.
User space is the memory area where application software and some drivers execute, while kernel space is reserved for running a privileged operating system kernel and device drivers. The separation of user space and kernel space provides memory protection and hardware protection from malicious or errant software behaviour.
Virtual memory is a system where physical memory is managed by the operating system typically with assistance from a memory management unit, which is part of many modern CPUs. It allows multiple types of memory to be used.
Memory paging is a technique to store and retrieve data from secondary storage for use in main memory. It is part of virtual memory implementations in modern operating systems, using pages as units of exchange between disk and RAM.
In virtual memory systems the operating system limits how a process can access the memory. This feature, called memory protection , can be used to disallow a process to read or write to memory that is not allocated to it, preventing malicious or malfunctioning code in one program from interfering with the operation of another.