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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The IBM 801, 802, and 803 line of check proofers used what were fundamentally
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63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54