Real Time Distributed System Studies/Scenarios.

摘要

This paper overviews previous years research and specifies in detail three computer systems functionally similar to subsets of existing U.S. Navy ship and submarine systems. The computer system description represent no specific system either deployed, under development, or proposed. For each system, the computer system performance requirements and computer equipment selection criterion are given. The intent is to provide meaningful test problems for university-based computer science research of real time distributed systems. The distributed processing scenarios assume that the research testbed systems contain at least three processors. Three scenarios have been described and an architecture for one has been defined and analyzed. Each is functionally similar to what can be expected in future Navy systems. Each has been parameterized so that the required processing resources can be scaled up or down. The spreadsheet contains nominal values chosen to produce a moderate load on a testbed of three, 3 MIP machines. Our analysis for scenario 1 was based on having three 1 MIP machines. The parameters were adjusted accordingly so that the utilizations did not exceed 100% and the task set was schedulable. The resources required to support the Submarine Passive Sonar scenario depend on the number of hydrophones and the number and type of formed beams. The more phones and beams, the more resources required. The resources required to carry out the functions of the Submarine CIC scenario depend on the number of operators. The Surface Ship Radar scenario resources depend on the number of tracks held.