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"NASA Technical Reports Server (NTRS) 19980169281: Design Of Object-Oriented Distributed Simulation Classes" and the language of the book is English.


“NASA Technical Reports Server (NTRS) 19980169281: Design Of Object-Oriented Distributed Simulation Classes” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 19980169281: Design Of Object-Oriented Distributed Simulation Classes
  • Author: ➤  
  • Language: English

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  • Internet Archive ID: NASA_NTRS_Archive_19980169281

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"NASA Technical Reports Server (NTRS) 19980169281: Design Of Object-Oriented Distributed Simulation Classes" Description:

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Distributed simulation of aircraft engines as part of a computer aided design package being developed by NASA Lewis Research Center for the aircraft industry. The project is called NPSS, an acronym for "Numerical Propulsion Simulation System". NPSS is a flexible object-oriented simulation of aircraft engines requiring high computing speed. It is desirable to run the simulation on a distributed computer system with multiple processors executing portions of the simulation in parallel. The purpose of this research was to investigate object-oriented structures such that individual objects could be distributed. The set of classes used in the simulation must be designed to facilitate parallel computation. Since the portions of the simulation carried out in parallel are not independent of one another, there is the need for communication among the parallel executing processors which in turn implies need for their synchronization. Communication and synchronization can lead to decreased throughput as parallel processors wait for data or synchronization signals from other processors. As a result of this research, the following have been accomplished. The design and implementation of a set of simulation classes which result in a distributed simulation control program have been completed. The design is based upon MIT "Actor" model of a concurrent object and uses "connectors" to structure dynamic connections between simulation components. Connectors may be dynamically created according to the distribution of objects among machines at execution time without any programming changes. Measurements of the basic performance have been carried out with the result that communication overhead of the distributed design is swamped by the computation time of modules unless modules have very short execution times per iteration or time step. An analytical performance model based upon queuing network theory has been designed and implemented. Its application to realistic configurations has not been carried out.

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