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(Created page with "{{DISPLAYTITLE:Online (Page Replacements)}} == Description == When page fault occurs during the program execution, operating systems use page replacement algorithms to select a victim page from primary memory and makes room for the required page. == Related Problems == Related: Offline == Parameters == No parameters found. == Table of Algorithms == {| class="wikitable sortable" style="text-align:center;" width="100%" ! Name !! Year !! Time !! Space !! Ap...") |
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== Parameters == | == Parameters == | ||
$n$: number of page requests | |||
$k$: number of pages able to fit in cache | |||
== Table of Algorithms == | == Table of Algorithms == | ||
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|} | |} | ||
== Time Complexity | == Time Complexity Graph == | ||
[[File:Page Replacements - Online - Time.png|1000px]] | [[File:Page Replacements - Online - Time.png|1000px]] | ||
Latest revision as of 09:12, 28 April 2023
Description
When page fault occurs during the program execution, operating systems use page replacement algorithms to select a victim page from primary memory and makes room for the required page.
Related Problems
Related: Offline
Parameters
$n$: number of page requests
$k$: number of pages able to fit in cache
Table of Algorithms
| Name | Year | Time | Space | Approximation Factor | Model | Reference |
|---|---|---|---|---|---|---|
| Not recently used | 1940 | $O(nk)$? | $O(k)$ | Exact | Deterministic | |
| First-in, first-out | 1940 | $O(nk)$? | $O(k)$ | Exact | Deterministic | |
| Second-chance | 1940 | $O(nk)$? | $O(k)$ | Exact | Deterministic | |
| Clock | 1940 | $O(nk)$? | $O(k)$ | Exact | Deterministic | |
| Least recently used | 1940 | $O(nk)$? | $O(k)$ | Exact | Deterministic | |
| Random | 1940 | $O(n)$ | $O(k)$? | Exact | Randomized | |
| Not frequently used (NFU) | 1940 | $O(nk)$? | $O(k)$ | Exact | Deterministic | |
| Aging | 1940 | $O(nk)$? | $O(k)$ | Exact | Deterministic | |
| Longest distance first (LDF) page replacement algorithm | 2017 | $O(nk)$? | $O(k)$ | Exact | Deterministic | Time |
Time Complexity Graph
