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- W2003201429 abstract "Computer systems with multiple processors are becoming more common for reasons of reliability and modularity. The use of asynchronous processors, however, leads to problems of complexity of control and of programming. This work investigates the application of multiple asynchronous processors to the computing task at the lowest level - that of interpreting single machine-language instructions. A particular computer configuration with 15 identical processors has been constructed using an interpretive simulator. The processors are of relatively low computing capacity. A common data bus connects the processors with each other and with the main memory. A restriction on the logical connections between processors allows each one to communicate with no more than 2 others, in a chain-like arrangement. Three examples - 2 sort instructions and a matrix multiply - were coded for this machine and run using the simulator. By varying the bus cycle time, it was concluded that adequate support of up to 15 processors can be provided by a common bus with cycle time equal to the processor cycle time. The amount of parallelism achieved was significant but showed dependence on hard-ware parameters and on the algorithm implementations. Direct simulation the computer, with an execution trace of the running system, has yielded some glimpses of how restriction of bus capacity can cause deterioration of the program execution efficiency and amount of parallelism. A simple economic model of a multiple processor system is developed and applied to the 3 examples. The result shows that the minimum cost per throughout occurs with 4,11, and !5 processors, respectively, for the 3 examples when the cost of a processor is i/i0 of the system cost." @default.
- W2003201429 created "2016-06-24" @default.
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- W2003201429 date "1973-01-01" @default.
- W2003201429 modified "2023-09-24" @default.
- W2003201429 title "Computing with multiple microprocessors" @default.
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- W2003201429 doi "https://doi.org/10.1145/800192.805810" @default.
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