pubmed.ncbi.nlm.nih.gov
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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.
不仅如此，国际酒店品牌的加速入华，正为行业竞争格局增添新的变数。