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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陆逸轩：第一轮的时候，我在YouTube上听过一点点别人的演奏，主要是为了感受比赛的气氛，让自己进入即将登台的状态。但之后基本就没有再听了，一方面是没有时间，另一方面也没有那个心情，只能把每天、每个小时都用在准备自己的演奏上。等到我弹完最后一轮之后，因为我是第一天演出的，后面还有两天比赛，我才去听了一些。紫桐是在我之后演出的，我去听了她的排练，帮忙一起听平衡之类的问题，也在音乐厅听了她的正式演出，更多是一种支持。但如果我自己还没有完成比赛，是不可能去听其他人的。，详情可参考爱思助手下载最新版本
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3It wasn’t the first time that nations at war turned to seaweed. During the First World War, the U.S. relied on the giant kelp seaweed (Macrocystis) to boost production of potash (a fertilizer produced in Germany), gunpowder, and acetone.