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Performability Modeling with UltraSAN.

Couvillion, Joseph A.; Freire, Roberto; Johnson, Ron; Obal, W. Douglas; Qureshi, M. Akber; Rai, Manish; Sanders, William H.; Tvedt, Janet E.

In: IEEE Software, Vol. 8, No. 5, pages 69-80. September 1991.

Also in: Proc. 4th Int. Workshop on Petri Nets and Performance Models (PNPM'91), Melbourne, Australia, pages 290-299. IEEE Comp. Soc. Press, December 1991.

Abstract: The X-Windows-based UltraSAN software package employs stochastic activity networks (SANs), a variation of Petri nets, to model and analyze the performance and dependability of software, hardware and network system designs. SANs provide `performability' modeling that overcomes the inabilities of previous modeling methods to evaluate performance and dependability in one model and to handle large-size systems. Various methods combine performability variables with SAN structure to, respectively, reduce the size of the stochastic process required for analytical solutions and speed simulation solutions.

Keywords: performability modelling (with) UltraSAN; net tool; X-Windows; UNIX; software performance; depandabiblity evaluation; speed simulation; stochastic process.

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