paging - definition

Create account
Where to search:
Thesaurus


Dictionaries » The Free On-line Dictionary of Computing » P »

paging - definition



A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
(Non-alphabetical character)


Free Online Dictionary of Computing - FOLDOC foldoc.org

paging Search for pronunciation examples


 
<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.
 
(1996-11-22)
 



Permanent link to this page: http://www.diclib.com/cgi-bin/d1.cgi?l=en&base=en_foldoc&page=showid&id=9530


Learn foreign languages chatting with us!

  • Jose Manuel, 47
    El Salvador, San Salvador
    Native language: Spanish
    Foreign language: English
    Trabajo en mantener infraestructuras en centro de computo y también me gusta y tengo un taller de reparación de vehículos. Me relación con muchos términos técnicos en ambos ambientes y necesito aprender el idioma ingles lo mas pronto posible.
    Jose Manue...
  • Anyi Moreno, 16
    Colombia, Ocaña
    Native language: Spanish
    Foreign language: Spanish
    Anyi Moren...
  • Kevin Macias, 24
    Ecuador, Quito
    Native language: Spanish
    Foreign language: Spanish
    Kevin Maci...
  • Juan Campos , 19
    Mexico, Mexico
    Native language: Spanish
    Foreign language: English, Italian, French
    Juan Campo...
  • LION, 22
    Kyrgyzstan, Bishkrk
    Native language: Russian
    Foreign language: English
    LION
  • Idelma, 42
    Cuba, Santiago De Cuba
    Native language: Spanish
    Foreign language: English
    Hello!
    Idelma
  • Gisela Martinez, 20
    Colombia, Bogota
    Native language: Spanish
    Foreign language: Spanish
    Gisela Mar...
  • angel gonzalez castillo, 25
    Mexico, Coahuila
    Native language: Spanish
    Foreign language: English
    i&# 39; m Michael from mexico city... i&# 39; m 23 years old , quisiera conocer gente de otros países, america del sur... espero platicar con ustedes... :) Dios los Bendiga
    angel gonz...
  • loren marroquin, 24
    Guatemala, Guatemala City
    Native language: Spanish
    Foreign language: Spanish
    loren marr...
  • Silvia, 46
    United States, Brooklyn
    Native language: Spanish
    Foreign language: English
    Silvia
  • Zhanibek, 18
    China, Shanghai
    Native language: Russian
    Foreign language: English
    Zhanibek
  • Акбота Ахан, 17
    Kazakhstan, Taraz
    Native language: Russian
    Foreign language: English
    Акбота Аха...
  • may, 23
    Colombia, Quibdo
    Native language: Spanish
    Foreign language: English
    may
  • inglishmaning
    Turkmenistan
    Native language: Russian
    Foreign language: English
    inglishman...
  • enrique, 24
    El Salvador, Santa Ana
    Native language: Spanish
    Foreign language: English
    enrique
  • ofa lopez, 22
    Nicaragua, Jinotepe
    Native language: Spanish
    Foreign language: English
    ofa lopez
  • Tamaity, 35
    Colombia, Girardot
    Native language: Spanish
    Foreign language: English
    Tamaity
  • Николетта, 17
    Ukraine, Кременчуг
    Native language: Russian, Ukrainian
    Foreign language: Russian
    Николетта
  • Laura, 10
    Mexico, Mexico
    Native language: Spanish
    Foreign language: English
    Laura
  • Lady Cueva, 23
    Ecuador, Quito
    Native language: Spanish
    Foreign language: English
    Lady Cueva