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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.
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In her survey, 22% of mothers and 20% of childless women picked such small gestures as one of the top two things that made them feel valued – more than big nights out or expensive presents.，更多细节参见safew官方版本下载
有一点很重要。该模型的初始准确率只有 58%。听起来不太像能直接用于生产环境，对吧？