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!

  • Paul Smith, 36
    Dominican Republic, Higuey
    Native language: French
    Foreign language: Spanish
    Paul Smith
  • Bahrom, 30
    Uzbekistan, Tashkent
    Native language: Russian
    Foreign language: English
    Bahrom
  • Juli, 39
    Russian Federation, Novorossiysk
    Native language: Russian
    Foreign language: Spanish
    Yo trabajo como analista financiero. En mi tiempo libre me encanta la pesca, la lectura. Me gusta dibujar y cantar, pero lo hago mal. Ahora está tratando de aprender español.
    Juli
  • Claudiu, 45
    Spain, Alicante
    Native language: Romanian, German
    Foreign language: Spanish, French, Italian
    Claudiu
  • gustavo, 21
    Colombia, Quibdo
    Native language: Spanish
    Foreign language: Spanish
    gustavo
  • alexsander, 22
    Mexico, Obregon
    Native language: Spanish
    Foreign language: Chinese Simplified, Chinese Traditional
    alexsander
  • Janara, 28
    Kazakhstan, Almaty
    Native language: Russian
    Foreign language: English
    Janara
  • Jhony Ruiz, 32
    El Salvador, San Salvador
    Native language: Spanish
    Foreign language: English
    Soy una persona tranquila me gusta leer mucho, tambien me gusta interactuar con los demas,,, me creo bastante sociable...
    Jhony Ruiz
  • варвара, 23
    Russian Federation, Samara
    Native language: Russian
    Foreign language: English
    Hi. I search for new friends.. I like swim and ride my bike sometimes.. i LOVE english
    варвара
  • Gulshat Djurayeva, 41
    Kazakhstan, Almaty
    Native language: Russian
    Foreign language: English
    Я художник , занимаюсь прикладным искусством ( гобелены , войлок, батик) Картины, шарфы, одежда.
    Gulshat Dj...
  • sunny nayak, 22
    India, Jodhpur
    Native language: Hindi, English
    Foreign language: English
    sunny naya...
  • Adriana, 63
    Argentina, Moreno
    Native language: Spanish
    Foreign language: French, Italian, Russian
    Adriana
  • Nathasky Tigrero, 19
    Ecuador, Guayaquil
    Native language: Spanish
    Foreign language: Spanish
    Nathasky T...
  • Fabiola, 20
    Honduras, San Pedro Sula
    Native language: Spanish
    Foreign language: English
    Fabiola
  • Rose, 35
    El Salvador, San Miguel
    Native language: Spanish
    Foreign language: English
    Rose
  • Emilio Devesa Pascual, 61
    Spain, Boadilla Del Monte
    Native language: Spanish
    Foreign language: English
    Emilio Dev...
  • Alex121268, 48
    United States, Jackson
    Native language: Russian
    Foreign language: English
    I m from Russia. Vladivostok. Now live in USA.
    Alex121268
  • gianmarco, 30
    Peru, Lima
    Native language: English, Maltese
    Foreign language: English
    gianmarco
  • Emilio Cafassi, 59
    Argentina, Buenos Aires
    Native language: Spanish
    Foreign language: English, French, Portuguese, Italian
    Emilio Caf...
  • Joe G., 48
    Paraguay, Fernando De La Mora
    Native language: Spanish
    Foreign language: English
    Joe G.