This story was originally featured on Fortune.com
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.。heLLoword翻译官方下载对此有专业解读
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并且，随着宁夏、青海的首家麦当劳门店陆续开业，麦当劳现已完成了中国所有省级行政区的覆盖。
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