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Cache coherence - Wikipedia

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In computer architecture, cache coherence is the uniformity 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 incoherent data, which is particularly the case with CPUs in a multiprocessing system. In the illustration on the right, consider both the clients have a cached copy of a particular memory block from a previous read. Suppose the client on the bottom updates/changes that memory block, the client on the top could be left with an invalid cache of memory without any notification of the change. Cache coherence is intended to manage such conflicts by maintaining a coherent view of the data values in multiple caches. In a shared memory multiprocessor system with a separate cache memory for each processor, it is possible to have many copies of shared data: one copy in the main memory and one in the local cache of each processor that requested it. When one of the copies of d

Cache coherence - Wikipedia Jump to content From Wikipedia, the free encyclopedia Equivalence of all cached copies of a memory location If two clients have a cached copy of a particular memory block and one client changes the block, the other client's copy must be invalidated or updated. If it is not, the system is in an incoherent state: it contains two different records of the same memory block which both claim to be up-to-date. Incoherent caches: The caches have different values of a single address location. In computer architecture , cache coherence is the uniformity of shared resource dat

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