Interactive LFU page replacement simulator: each page keeps a reference-frequency count shown as a bar, and the least frequently used page is evicted, with ties broken by least recently used.
Presets
Reference stringevery reference bumps that page's count
Step 0 / 0
Idle
Press play or step forward to begin. LFU counts how many times each page has been referenced. On a hit, the count goes up by one. On a fault with no free frames, the page with the smallest count is evicted — ties are broken by least-recently-used. A fresh page starts at count 1.
Pages ordered by frequency · least used (evict next) → most used