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Definition of "Coherence" |
A definite phase relationship between two energy waves, such as transmitted frequency and reference frequency. / In computing, cache coherence is the consistency of shared resource data that ends up stored in multiple local caches. When clients in a system maintain caches of a common memory resource, problems may arise with inconsistent data. This is particularly true of CPUs in a multiprocessing system. Referring to the illustration on the right, if the top client has a copy of a memory block from a previous read and the bottom client changes that memory block, the top client could be left with an invalid cache of memory without any notification of the change. Cache coherence is intended to manage such conflicts and maintain consistency between cache and memory. / (1) measure of the extent to which knowledge of a field at one point in space permits prediction of the field at another point. |
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