virtual memory - перевод на русский
![The University of Manchester [[Atlas Computer]] was the first computer to feature true virtual memory.](https://commons.wikimedia.org/wiki/Special:FilePath/University of Manchester Atlas, January 1963.JPG?width=200 "The University of Manchester [[Atlas Computer]] was the first computer to feature true virtual memory.")
[və:tʃuəl'mem(ə)ri]
общая лексика
VM
виртуальная память
способ расширения объёма адресуемой физической памяти за счет разбиения её на страницы (page) фиксированного размера (в некоторых системах - на сегменты переменной длины) и организации выгрузки неиспользуемых страниц в буферную область на диске (см. swap file, swapping) и загрузки их с диска при запросе. Преимущество использования виртуальной памяти в том, что программу не нужно разбивать на оверлеи (overlay), можно загрузить на исполнение большее число приложений и обрабатывать в программе большие массивы данных
вычислительная техника
виртуальная или дополнительная память ЭВМ
Смотрите также
общая лексика
виртуальная память
Википедия
In computing, virtual memory, or virtual storage is a memory management technique that provides an "idealized abstraction of the storage resources that are actually available on a given machine" which "creates the illusion to users of a very large (main) memory".
The computer's 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. Main storage, as seen by a process or task, appears as a contiguous address space or collection of contiguous segments. The operating system manages virtual address spaces and the assignment of real memory to virtual memory. Address translation hardware in the CPU, often referred to as a memory management unit (MMU), automatically translates virtual addresses to physical addresses. Software within the operating system may extend these capabilities, utilizing, e.g., disk storage, to provide a virtual address space that can exceed the capacity of real memory and thus reference more memory than is physically present in the computer.
The primary benefits of virtual memory include freeing applications from having to manage a shared memory space, ability to share memory used by libraries between processes, increased security due to memory isolation, and being able to conceptually use more memory than might be physically available, using the technique of paging or segmentation.
