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1. A partner of the memory management algorithm to achieve a recovery after the application of the memory block allocation and release. Experimental preparation random function simulation process memory application, and released in a more random order. Statistics, when applications allocate memory failed to distinguish between the actual lack of space and because of the debris and can not meet its debris. Design a virtual memory storage area and workspace, access to the hit rate and use the following algorithm. 1) The best replacement algorithm (Optimal) 2) first-in, first-out method (Fisrt In First Out), 3) Recently the most-recently-used (Least Recently Used) 4) is not the most frequently used method (Least Frequently Used) 5) unused method recently (No Used Recently) which hit rate = 1- the number of page faults/page address stream length. The test of the performance of the above algorithm to be compared to the relationship between: page number and hit rate compare the hit rate in