Discrete Event Simulation: It's Easy with SimPy!

This paper introduces the practicalities and benefits of using SimPy, a discrete event simulation (DES) module written in Python, for modeling and simulating complex systems. Through a step-by-step exploration of the classical Dining Philosophers Problem, we demonstrate how SimPy enables the efficient construction of discrete event models, emphasizing system states, transitions, and event handling. We extend the scenario to introduce resources, such as chopsticks, to model contention and deadlock conditions, and showcase SimPy's capabilities in managing these scenarios. Furthermore, we explore the integration of SimPy with other Python libraries for statistical analysis, showcasing how simulation results inform system design and optimization. The versatility of SimPy is further highlighted through additional modeling scenarios, including resource constraints and customer service interactions, providing insights into the process of building, debugging, simulating, and optimizing models for a wide range of applications. This paper aims to make DES accessible to practitioners and researchers alike, emphasizing the ease with which complex simulations can be constructed, analyzed, and visualized using SimPy and the broader Python ecosystem.