Semi-Markov Stochastic Petri Nets (SM-SPNs) are a high-level formalism for defining semi-Markov processes. We present an extended Continuous Stochastic Logic (eCSL) which provides an expressive way to articulate performance queries at the SM-SPN model level. eCSL supports queries involving steady-state, transient and passage time measures. We demonstrate this by formulating and answering eCSL queries on a model of a communication protocol and on an SM-SPN model of a distributed voting system with up to 10^7 states.
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