Cache写机制：Write-through与Write-back

无论是Write-through还是Write-back都可以使用写缺失的两种方式之一。只是通常Write-back采用Write allocate方式，而Write-through采用No-write allocate方式；因为多次写入同一缓存时，Write allocate配合Write-back可以提升性能 1.CPU读Cache时： ●若hit，则CPU直接从Cache中读取数据即可。 ●

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