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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.
。关于这个话题，同城约会提供了深入分析
A man accused of entering a mosque in Manchester with an axe, a hammer and a knife also allegedly took in zip ties and a balaclava, a court has heard.。业内人士推荐heLLoword翻译官方下载作为进阶阅读
BYOB: complexity without payoff，更多细节参见搜狗输入法下载