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.
回顾过往，教训犹在。有的地方和部门好大喜功、贪大求全、盲目跟风、华而不实，打造“政绩工程”“形象工程”，最终留下来的往往是“烂摊子”。这严重挫伤干部群众的信心，甚至贻误宝贵的发展时机。
// 5. 整数且范围小: 计数排序，详情可参考服务器推荐
length. Wrapping malloc in this way does not mean:
，这一点在safew官方版本下载中也有详细论述
'required': ['color'],
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