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Definition of "cache coherence" |
the problem of keeping consistent the values of multiple copies of a single variable, residing either in main memory and cache in a uniprocessor, or in different caches in a multiprocessor computer. In a uniprocessor, the problem may arise if the I/O system reads and writes data into the main memory, causing the main memory and cache data to be inconsistent, or if there is aliasing. Old (stale) data could be output if the CPU has written a newer value in the cache, and this has not been transported to the memory. |
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