paging

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paging

[′pāj·iŋ]
(computer science)
The scheme used to locate pages, to move them between main storage and auxiliary storage, or to exchange them with pages of the same or other computer programs; used in computers with virtual memories.

paging

(operating system)
A technique for increasing the memory space available by moving infrequently-used parts of a program's working memory from RAM to a secondary storage medium, usually hard disk. The unit of transfer is called a page.

A memory management unit (MMU) monitors accesses to memory and splits each address into a page number (the most significant bits) and an offset within that page (the lower bits). It then looks up the page number in its page table. The page may be marked as paged in or paged out. If it is paged in then the memory access can proceed after translating the virtual address to a physical address. If the requested page is paged out then space must be made for it by paging out some other page, i.e. copying it to disk. The requested page is then located on the area of the disk allocated for "swap space" and is read back into RAM. The page table is updated to indicate that the page is paged in and its physical address recorded.

The MMU also records whether a page has been modified since it was last paged in. If it has not been modified then there is no need to copy it back to disk and the space can be reused immediately.

Paging allows the total memory requirements of all running tasks (possibly just one) to exceed the amount of physical memory, whereas swapping simply allows multiple processes to run concurrently, so long as each process on its own fits within physical memory.

paging

(1) In a virtual memory computer, it is the transfer of program segments (pages) into and out of memory. Although paging is the primary mechanism for virtual memory, excessive paging is not desirable (see thrashing).

(2) A communications service that began in the U.S. in the 1980s. It evolved from a one-way beeper to one-way numeric text to one-way alphanumeric text to a two-way text service.
References in periodicals archive ?
Each student will be provided a copy of a Windows paging file and an appropriate text editor/searching tool.
Fortunately, the fragmented files are of minor importance, and my paging file is contiguous, so in daily use the computer performs well.
The purpose of the paging file is to store over-committed system memory.
However, because these guidelines places these critical system files beyond the range of routine defragmentation methods, Microsoft also notes that, "The standard solution is to defragment the MFT and the Paging File during boot time, using a third-party, enterprise-level defragmenter.
In addition to all the Metadata, PerfectDisk 2000 also defragments the paging file and directories.
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0 for Windows NT is equipped with breakthrough technology for Windows NT paging file defragmentation.
It defragments the Master File Table and all its associated Metadata, paging file, and directories, and defragments the entire disk in a single pass.
It is the only Windows 2000 utility that defragments and optimizes all files on a disk, including the Master File Table and its associated Metadata, paging files, and directories.
Built on PKCS#11 standards, and featuring the AES 256-bit encryption algorithm, SecureDoc encrypts all residual data, temporary files, paging files, and hidden partitions that are often left unprotected.
PerfectDisk 2000 is the only Windows 2000 utility that defragments and optimizes all files on a disk, including the Master File Table and its associated Metadata, paging files, and directories.