Source: Computational Materials Science, Volume 267
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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.，详情可参考Safew下载
By the early 1960s, with ERMA on the scene, IBM's started to catch up.