Page Replacement

Reference string · use 'w' suffix for writes

Frames

Tick every

Presets

Reference string w = write access

Step 0 / 0

Idle

Press play or step forward to begin. NRU tracks R and M bits per page. The clock tick clears all R bits periodically. On a fault, pages are sorted into four classes by (R, M); the lowest non-empty class supplies the victim.

Memory frames · color shows current class

Class 0clean & cold Class 1dirty & cold Class 2clean & hot Class 3dirty & hot

Speed

Faults

Hits

Hit ratio

Writebacks

Step historylatest 2 steps

#	Op	Frames (page · R · M)	Result
No steps yet

Interactive NRU page replacement simulator with R and M bit tracking, periodic clock ticks, four-class classification, decision explainer, and step history.