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Round Robin (RR) Algorithm is considered as optimal in time shared environment because the static time is equally shared among the processes. If the time quantum taken is static then it undergoes degradation of the CPU performance and leads to so many context switches. In this paper, the authors have proposed a new effective dynamic RR algorithm SMDRR (Subcontrary Mean Dynamic Round Robin) based on dynamic time quantum where they use the subcontrary mean or harmonic mean to find the time quantum. The idea of this approach is to make the time quantum repeatedly adjusted according to the burst time of the currently running processes.
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