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2023-10-23 23:09:51 +02:00
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remplacement de page - algorithme optimal.md Normal file
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up:: [[algorithme de remplacement de page]]
title:: "on doit connaître le futur ==> impossible à implémenter"
#informatique
---
> [!definition] Stratégie
> - dans un nouveau cadre si il reste de la place
> - remplace la page qui sera rappellée dans le plus de temps possible (maximiser le temps avant un nouveau [[SE - défaut de page|défaut de page]]) si il ne reste plus de place
# Exemple
avec 3 cadres (1, 2, 3)
| pages demandées : | 5 | 0 | 1 | 2 | 0 | 3 | 0 | 4 | 2 | 3 | 0 | 3 | 2 | 1 | 2 |
| ----------------- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| page 0 | | 2 | | | | | | X | | | 2 | | | X | |
| page 1 | | | 3 | | | X | | | | | | | | 2 | |
| page 2 | | | | 1 | | | | | | | | | | | |
| page 3 | | | | | | 3 | | | | | | | | | |
| page 4 | | | | | | | | 2 | | | X | | | | |
| page 5 | 1 | | | X | | | | | | | | | | | |
| | | | | | | | | | | | | | | | |
| défaut de page | D | D | D | D | | D | | D | | | D | | | D | |
- 8 défauts de pages