Download Performance Analysis of Queuing and Computer Networks by G.R. Dattatreya PDF

By G.R. Dattatreya

Performance research of Queuing and laptop Networks develops easy versions and analytical equipment from first rules to guage functionality metrics of assorted configurations of computers and networks. It provides many innovations and result of chance concept and stochastic techniques.

After an advent to queues in computing device networks, this self-contained ebook covers vital random variables, resembling Pareto and Poisson, that represent types for arrival and repair disciplines. It then bargains with the equilibrium M/M/1/∞queue, that is the easiest queue that's amenable for research. next chapters discover functions of continuing time, state-dependent unmarried Markovian queues, the M/G/1 method, and discrete time queues in laptop networks. the writer then proceeds to review networks of queues with exponential servers and Poisson exterior arrivals in addition to the G/M/1 queue and Pareto interarrival instances in a G/M/1 queue. The final chapters research bursty, self-similar site visitors, and fluid stream types and their results on queues.

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J! (n − j)! λ1 λ1 + λ2 j n−j λ2 λ1 + λ2 . 113) 1 2 In the above, λ1λ+λ and λ1λ+λ can be considered to be probability values summing 2 2 to 1. With this interpretation, the sum in the above equation is the sum of all probabilities of a fictitious binomial random variable. Therefore this sum must evaluate to 1, giving us e−(λ1 +λ2 )T [(λ1 + λ2 ) T ] n! n P [n at C over T ] = showing that the resulting stream at C is Poisson with rate λ1 + λ2 . An alternative proof, based on the Z transform is much simpler.

Lim δt→0 3. P [k1 arrivals in (t1 , t2 ] and k2 in (t2 , t3 ]] = P [k1 arrivals in (t1 , t2 ]] · P [k2 arrivals in (t2 , t3 ]] . 46) From these three defining assumptions, we can derive the probability mass function (pmf), P [k arrivals in (0, T ]]. The pmf will be a function of only one parameter value λ, which is found in the defining assumptions (and the time interval T ). 1 Derivation of the Poisson pmf Consider a time interval (0, T ]. Divide this interval into n equal parts. As n increases and tends to ∞, Tn → 0 and we have a narrow sub-interval tending to 0.

The number of customers in the system is a function of the continuous time variable. The average of this time varying function, over a long time interval, is the required performance figure. The average response time is the average of the response time intervals experienced by all the customers over the long time interval. The average waiting time and the average service time are similarly defined. The fraction of time the server is busy is also an important performance criterion. It corresponds to the total of the time intervals that the server is busy, divided by the total time of the queue operation.

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