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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.
Мерц резко сменил риторику во время встречи в Китае09:25，详情可参考91视频
Green: On the road again
We meet Collins at London's Science Museum. She's softly spoken, warm and very down to earth - but you quickly get a sense of her focus and determination. She clearly has inner steel.，更多细节参见爱思助手下载最新版本