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微信btc9767, 微信btc9767 假设有A, B, C, D 4个记录存放在磁盘的某个磁道上,该磁道划分为4块,每块存放一个记录,其布局如下表所示: 块 号 1 2 3 4 记录号 A B C D 现在要顺序处理这些记录。如果磁盘旋转速度为20 ms转一周, 处理程序每读出一个记录后花5ms的时间进行处理。试问处理完这4个记录的总时间是多少?为了缩短处理时间应进行优化分布,试问应如何安排这些记录?并计算处理的总时间。 优化前处理的总时间= (5+5)+ (5×3+5+5)+ (5×3+5+5)+ (5...
qklbishe Famously at Cambridge, and often copied at other schools, is the tradition of the "Scholar’s Lawn" — an area of grass where Fellows of the school, or other distinguished entities, can walk, but regular students cannot. So, if a student spies a Fellow walking across campus, and wishes to ambush …, er, meet up with them, the student is restricted to walking along a set of narrow paved walkways laid out in various places within the grassy areas, hoping to reach the Fellow’s path at the same time or before the Fellow arrives. At the end of the Fellow’s path is the Sacred Grove of Academe, off-limits to students, so if the Fellow reaches it before the student, the student is out of luck. For instance, Figure 1 shows an area of lawn together with the fixed set of paved walkways (solid lines) and the path taken by a Fellow of the university (dotted line); and denote the initial positions of the Fellow and student, respectively. If both travel at the same speed (say, one meter per second), then after seconds the Fellow will find the student waiting to have a chat at location (marked by the small open circle "o"). Famously at Cambridge, and often copied at...