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Computing (FOLDOC) dictionary
cache coherency
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storage (Or "cache consistency") /kash koh-heer'n-see/ The
synchronisation of data in multiple caches such that reading
a memory location via any cache will return the most recent
data written to that location via any (other) cache.
Some parallel processors do not cache accesses to sharedmemory to avoid the issue of cache coherency. If caches are
used with shared memory then some system is required to detect
when data in one processor's cache should be discarded or
replaced because another processor has updated that memory
location. Several such schemes have been devised.