This function gives the maximal throughput of a two-server supercomputer (Markov) model with various service speeds, various rates of classes and random speed scaling at arrival/depature
MaxThroughput2(p1, pa, pd, mu1, mu2, f1, f2)
probability of class 1 arrival
probability of speed switch from f1 to f2 upon arrival
probability of speed switch from f2 to f1 upon departure
work amount parameter (for exponential distribution) for class 1
work amount parameter (for exponential distribution) for class 2
low speed (workunits per unit time)
high speed (workunits per unit time)
maximal input rate, that is the stability boundary