Page Replacement — Second Chance

Reference string

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Reference string processed left to right

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Idle

Press play or step forward to begin. Second Chance is FIFO with a reference bit. On a hit, the page's bit is set to 1. On a fault, inspect the page at the front of the queue: if its bit is 1, clear it and move it to the back (a second chance); repeat until you reach a page with bit 0 — that one is evicted.

FIFO queue with reference bits · front (oldest) → back (newest)

inspect
front

load /
spared

Speed

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Chances given

Step historylatest 2 steps

#	Pg	Queue front→back (page:bit)	Result
No steps yet

Interactive Second Chance page replacement simulator: a FIFO queue with reference bits, where pages with their bit set are rotated to the back instead of evicted.