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Stochastic Performance Analysis Of Distributed Activities, Toqeer A. Israr
Stochastic Performance Analysis Of Distributed Activities, Toqeer A. Israr
Toqeer A Israr
This paper analyzes stochastic performance of a distributed global activity, composed of sub-activities sequenced serially, probabilistically, or concurrently. We provide general formulas with which we calculate the per-formance of a composite activity based on the performance of the constituent sub-activities and the control structure. To do this, we model each sub-activity as a Partially Ordered Specification (POS), where each sub-activity is character-ized by independent input events, dependent output events and the stochastic minimum delays between these events. This technique allows two or more sub-activities to be combined hierarchically. Proofs of correctness for these formu-las are given and a simple example …
Performance Modeling Of Distributed Collaboration Services With Independent Inputs/Outputs, Toqeer A. Israr, Gregor V. Bochmann
Performance Modeling Of Distributed Collaboration Services With Independent Inputs/Outputs, Toqeer A. Israr, Gregor V. Bochmann
Toqeer A Israr
This paper deals with modeling and performance analysis of dis-tributed applications, service compositions and workflow systems. From the functional perspective, the distributed application is modeled as an activity in-volving several roles, where behavior is defined in terms of compositions from several sub-activities using the standard sequencing operators found in UML Activity Diagrams. Each activity is characterized by a certain number of input and output events, and the performance of the activity is defined by the mini-mum delays that apply for a given output event in respect to each input event. We use a partial order to model these events, whose …