Snooping At Work

By snooping the cache controller for processor P3 can take action in response to P1’s write

P1

a: 4 5

P2

a: 5

P3

a: 4 5

a: 4 5 Memory

P1 reads a into cache

P3 reads a into cache

P1 writes a to 5, and

writes through to main

memory, correcting it

P3 sees WT, invalidates

or updates

P2 reads a into cache

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