Simulation of Three CPU Scheduling Algorithms

In this article, we conduct an in-depth exploration of three distinct CPU scheduling algorithms: Shortest Job First (SJF), Highest Response Ratio Next (HRRN), and Round Robin (RR). We implement simulation programs to model these algorithms and calculate critical performance metrics including R (average response time), U (CPU utilization), and S (throughput) to better understand their characteristics and trade-offs. For each algorithm, we provide detailed explanations of their operating principles, advantages, limitations, and practical applications in different scenarios. The SJF algorithm implementation prioritizes processes with the shortest execution time, requiring maintenance of a priority queue sorted by burst time. The HRRN algorithm calculates response ratios using the formula (waiting time + burst time)/burst time, dynamically adjusting priorities to prevent starvation. The RR algorithm employs a circular queue structure with time quanta management, requiring careful handling of context switching overhead. Through enhanced technical details and implementation insights, we enrich this discussion to make these complex algorithms more accessible and practically applicable for readers.