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Cache invalidation is a process in a computer system whereby entries in a cache are replaced or removed.. It can be done explicitly, as part of a cache coherence protocol. In such a case, a processor changes a memory location and then invalidates the cached values of that memory location across the rest of the computer system.
If this causes a block to be evicted from L1, there is no involvement of L2. If the block is not found in either L1 or L2, then it is fetched from the main memory and placed in both L1 and L2. Now, if there is an eviction from L2, the L2 cache sends a back invalidation to the L1 cache, so that inclusion is not violated.
Invalid may refer to: Patient, a sick person; one who is confined to home or bed because of illness, disability or injury (sometimes considered a politically ...
Validity designates an action which produces the effects intended; an action which does not produce the effects intended is considered "invalid". [1] [2] Liceity designates an action which has been performed legitimately; an action which has not been performed legitimately is considered "illicit". [3] [4] Some actions can be illicit, but still ...
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In voting, a ballot is considered spoilt, spoiled, void, null, informal, invalid or stray if a law declares or an election authority determines that it is invalid and thus not included in the vote count. This may occur accidentally or deliberately. The total number of spoilt votes in a United States election has been called the residual vote. [1]
An action, document, or transaction which is void is of no legal effect whatsoever: an absolute nullity—the law treats it as if it had never existed or happened. The term void ab initio, which means "to be treated as invalid from the outset", comes from adding the Latin phrase ab initio (from the beginning) as a