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Dynamic memory management is an important advance in memory allocation, especially in virtual memory systems. In this paper we consider the case of paged memory systems — i.e., systems whose physical and logical address space is partitioned into equal sized blocks of contiguous addresses. Paged memories have been used by many computer systems. However, the relationships among page fault frequency (the frequency of those instances at which an executing program requires a page of data or instructions not in main memory), efficiency, and space-time product with various replacement algorithms and page sizes are still not sufficiently understood and are of considerable interest.