| slovo | definícia |
paging
(encz) | paging,stránkování n: |
Paging
(gcide) | Paging \Pa"ging\, n.
The marking or numbering of the pages of a book.
[1913 Webster] |
Paging
(gcide) | Page \Page\, v. t. [imp. & p. p. Paged (p[=a]jd); p. pr. & vb.
n. Paging (p[=a]"j[i^]ng).]
To mark or number the pages of, as a book or manuscript; to
furnish with folios.
[1913 Webster] |
paging
(wn) | paging
n 1: calling out the name of a person (especially by a
loudspeaker system); "the public address system in the
hospital was used for paging"
2: the system of numbering pages [syn: pagination, folio,
page number, paging] |
paging
(foldoc) | paging
paged
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)
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| | podobné slovo | definícia |
rampaging
(encz) | rampaging,běsnění n: Zdeněk Brožrampaging,zuření n: Zdeněk Brož |
Paging
(gcide) | Paging \Pa"ging\, n.
The marking or numbering of the pages of a book.
[1913 Webster]Page \Page\, v. t. [imp. & p. p. Paged (p[=a]jd); p. pr. & vb.
n. Paging (p[=a]"j[i^]ng).]
To mark or number the pages of, as a book or manuscript; to
furnish with folios.
[1913 Webster] |
demand paging
(foldoc) | demand paging
demand paged
A kind of virtual memory where a page
of memory will be paged in if an attempt is made to access
it and it is not already present in main memory. This
normally involves a memory management unit which looks up
the virtual address in a page map to see if it is paged
in. If it is not then the operating system will page it in,
update the page map and restart the failed access. This
implies that the processor must be able to recover from and
restart a failed memory access or must be suspended while some
other mechanism is used to perform the paging.
Paging in a page may first require some other page to be moved
from main memory to disk ("paged out") to make room. If this
page has not been modified since it was paged in, it can
simply be reused without writing it back to disk. This is
determined from the "modified" or "dirty" flag bit in the
page map. A replacement algorithm or policy is used to
select the page to be paged out, often this is the {least
recently used} (LRU) algorithm.
Prepaging is generally more efficient than demand paging.
(1998-04-24)
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prepaging
(foldoc) | prepaging
working set model
(Or "working set model") A technique whereby
the operating system in a paging virtual memory
multitasking environment loads all pages of a process's
working set into memory before the process is restarted.
Under demand paging a process accesses its working set by
page faults every time it is restarted. Under prepaging the
system remembers the pages in each process's working set and
loads them into physical memory before restarting the process.
Prepaging reduces the page fault rate of reloaded processes
and hence generally improves CPU efficiency.
["Modern Operating Systems", Andrew S. Tanenbaum,
pub. Prentice Hall, Inc. 1992].
(1998-04-23)
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simple network paging protocol
(foldoc) | Simple Network Paging Protocol
SNPP
(SNPP) A standard for sending one- and two-way
wireless messages to pagers. In its simplest form, SNPP
provides a simple way to make a link between the Internet
and a Telocator Alphanumeric input Protocol (TAP) paging
terminal. SNPP is defined in RFC 1861.
(1997-04-25)
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