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页面存取算法
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页面存取算法
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理学
在线算法
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page access algorithm
页面存取算法
分页(paging),是一种操作系统里存储器管理的一种技术,可以使电脑的主存可以使用存储在辅助存储器中的数据。操作系统会将辅助存储器(通常是磁盘)中的数据分区成固定大小的区块,称为“页”(pages)。当不需要时,将分页由主存(通常是内存)移到辅助存储器;当需要时,再将数据取回,加载主存中。页面存取算法被用来决定哪些页被置换出去。当一个被置换出去的页面再次被访问的时候,需要先将该页面置换进来,而此期间程序必须处于等待状态。因此一个好的页面存取算法应该尽可能减少程序等待时间。
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