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

By G.R. Dattatreya

Performance research of Queuing and machine Networks develops basic versions and analytical equipment from first rules to judge functionality metrics of assorted configurations of computers and networks. It provides many ideas and result of chance concept and stochastic strategies.

After an advent to queues in machine networks, this self-contained e-book covers very important random variables, comparable to Pareto and Poisson, that represent versions for arrival and repair disciplines. It then bargains with the equilibrium M/M/1/∞queue, that's the easiest queue that's amenable for research. next chapters discover purposes of continuing time, state-dependent unmarried Markovian queues, the M/G/1 process, and discrete time queues in computing device 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 occasions in a G/M/1 queue. The final chapters study bursty, self-similar site visitors, and fluid move versions and their results on queues.

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Additional resources for Performance Analysis of Queuing and Computer Networks (Chapman & Hall Crc Computer & Information Science Series)

Sample text

9) x < β. An alternative common form of representation uses the Hurst parameter H instead of α. Harold Edwin Hurst (1880–1978) was a British hydrologist. He studied long term storage capacities of reservoirs based on empirical observations on the river Nile. The Hurst parameter for a Pareto random variable is given by H= 3−α . 10) Characterization of Data Traffic 17 Let us evaluate the properties of the above valid density function. 12) x < β. 16) β = α βα x−α+1 −α + 1 ∞ . 17) β Now, α needs to be larger than 1 for finite E[X].

If the external inputs themselves form all of the extensive random data, we are not using the computer to simulate; we would only be using it to operate a system, possibly a queue, to which random data from elsewhere are input. The best we can hope to achieve is to use the computer to generate a long sequence of numbers that “appear” to have the properties of the outcome of a sequence of iid random variables. There are excellent algorithms for this purpose. Typically they approximate the generation of iid uniformly distributed random variables.

The distribution of this random variable may be influenced by the fact that we have waited for t1 amount of time, without success. Let us evaluate the conditional probability P [X > t1 + t|X > t1 ]. The quantity t is the real variable corresponding to the additional wait period beyond t1 . 103) which is also the same as P [X > t]. Thus, we see that P [X > t1 + t|X > t1 ] = P [X > t]. That is, “how much longer” we need to wait is independent of how long we have already waited! In other words, this scheme “forgets” how long an arrival has not occurred.

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