The M/G/1 queue has exponentially distributed interarrival times, general process times, and a single server. The inclusion of general process times makes this formula more relevant for wafer fabs, where processing times are typically not as variable as the exponential distribution used with M/M/1 queues. The dispatch rule is FIFO for the equations that follow. Let λ be the arrival rate, μ the service rate, and ρ = λ/μ be the traffic intensity (server loading). From Equation 6.25 of Prabhu, the mean of the long-term cycle time distribution is given by
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