buffer和cache

  • 2015-04-30
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Cache(缓存

位于CPU与内存之间的临时存储器,缓存容量比内存小的多,但交换速度比内存更快。Cache通过缓存文件数据块来解决CPU运算速度与内存读写速度不匹配的矛盾,以提高CPU和内存之间的数据交换速度。Cache缓存越大,CPU处理速率越快

Buffer(缓冲)

高速缓冲存储器,通过缓存磁盘(I/O设备)数据块来加快对磁盘上数据的访问,从而减少I/O,并提高内存和硬盘(或其他I/O设备)之间的数据交换速度。注意,Buffer是即将要被写入磁盘的,而Cache是被从磁盘中读出来的。

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