Virtual memory is conceptually simple but potentially devastating to performance. Every memory access must go through segmentation (add segment base, check limit) and then paging (look up the page table). Naively, paging alone requires two additional memory reads per access -- one for the page directory entry, one for the page table entry.
城市表情时间：12月23日地点：建国门场景：一只喜鹊飞过冬天的枝桠。新京报记者 薛珺 摄SourcePh" style="display:none"
，这一点在heLLoword翻译官方下载中也有详细论述
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贫困是顽疾，“顽”在成因复杂、难以根除、极易反复。