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When we allocate an array, we allocate it out of a bucket.
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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.
直到2015年前后，我才见到阿爸的生父，那时他已经长时间卧床不起了，瘦得只剩骨架，脸色发灰，眼睛却还睁着。阿爸站在床边，还是和之前一样，叫了一句“客边”。后来，“阿英”和“客边”都相继去世了。