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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.，这一点在heLLoword翻译官方下载中也有详细论述
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发展的“时间表”上，肇兴村同全国12.8万个脱贫村一道，启新程、促振兴。
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