| slovo | definícia |
working set
(foldoc) | working set
The set of all pages (in a paging {virtual
memory} system) used by a process during some time interval.
As a result of locality of reference, the working set
frequently consists of a relatively small fraction of a
process's total virtual memory pages. While a process's
entire working set is in physical memory the process will
run without page faults. If the working set is too large
for available physical memory, the process causes frequent
page faults.
In a multitasking environment, information about which pages
are in each process's working set allows the memory management
system to improve CPU efficiency by prepaging (also called
the working set model).
["Modern Operating Systems", Andrew S. Tanenbaum, pub.
Prentice Hall, Inc. 1992].
(1997-04-09)
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| | podobné slovo | definícia |
working set model
(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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