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.
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Up to 100k words are generated each month and can go up to over 300k.，这一点在WPS下载最新地址中也有详细论述
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