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Silberschatz, Galvin and Gagne ©2005

Operating System Concepts

Migration of Integer A from Disk to Register

Multitasking environments must be careful to use most recent value, not matter where it is stored in the storage hierarchy

Multiprocessor environment must provide cache coherency in hardware such that all CPUs have the most recent value in their cache

Distributed environment situation even more complex

Several copies of a datum can exist

Various solutions covered in Chapter 17

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