Hockney model

We have used expressions involving the latency, a, and inverse bandwidth, /3, to model the communication time. An alternative model, the Hockney model, is sometimes used for the communication time in a parallel algorithm. The Hockney model expresses the time required to send a message between two processes in terms of the parameters Too and ni, which represent the asymptotic bandwidth and the message length for which half of the asymptotic bandwidth is attained, respectively. Metrics other than the speedup and efficiency are used in parallel computing. One such metric is the Karp-Flatt metric, also referred to as the experimentally determined serial fraction. This metric is intended to be used in addition to the speedup and efficiency, and it is easily computed. The Karp-Flatt metric can provide information on parallel performance characteristics that caimot be obtained from the speedup and efficiency, for instance, whether degrading parallel performance is caused by incomplete parallelization or by other factors such as load imbalance and communication overhead. ... 

R. W. Hockney, S. P. Goel, and J. W. Eastwood,/. Comput. Phys., 14, 148 (1974). Quiet High-Resolution Computer Models of a Plasma. 

Random walk MC is an alternative technique for studying charge transport in electronic devices see, for example, the book by Hockney and Eastwood [23]. In terms of lengthscales, MC studies lie between a microscopic level description of electronic and optical properties at organic/oxide interfaces where charge separation and recombination occur, discussed in this volume by De AngeUs [24], and a device model. 

Hockney, R. W, Goel, S. R, Eastwood, J. W. (1974). Quiet high-resolution computer models... 

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