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The demonstrated research results are an attempt to apply Queueing Theory (QT) and TCPNs formalism to the development of a software tool that can support distributed Internet system design.
The values are calculated by using TCPNs. It is shown how the Coloured Petri Net model of a distributed Internet system is created with some of its data structures and functions, and gives an examples of system analysis.
A distributed Internet system model, initially described in compliance with Queueing Theory (QT) rules, is mapped onto the Timed Coloured Petri Net (TCPN) structure by means of queueing system templates.
For the effective modeling TCPN enable to distribute parts of the net across multiple subnets.
The state of the system is determined by the number and distribution of the tokens representing data packets within the TCPN model.
Generally, the queueing system template is characterized by the following parameters: average tokens service time (ps_ser_mean_time), number of servers (number of tokens in TIMERS place) and service discipline (the TCPN's structure).
Having a set TCPN based queueing systems models a systematic methodology of Internet system modeling and analysis may be proposed.
Figure 5 shows the TCPN based model of above mentioned queueing network.
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