A method for analyzing the performance of computer communication networks using queueing network models (QNM's) is presented in this paper. The user/computer sites are interconnected by a wide-area network with an end-to-end window flow-control mechanism. The QNM for the system including the communication subnet and the host computers is intractable because of blocking due to window flow control and memory constraints at computer systems, even under otherwise analytically favorable assumptions. The approximate solution method, which is based on iteration and decomposition, combines several recently developed computationally inexpensive algorithms to compute user response times, taking into account the delay in the communication network and the processing time at computer systems. We also introduce a fast non-iterative procedure to analyze QNM's with external arrivals and with population size constraints, such that blocked customers are queued. The effect of the choice of window sizes and minimum link/bifurcated routing on system performance is investigated.
本文提出了一种使用排队网络模型(QNM)分析计算机通信网络性能的方法。用户/计算机站点通过具有端到端窗口流控制机制的广域网互连。包括通信子网和主机在内的系统的QNM是棘手的,因为即使在分析上有利的假设下,由于窗口流控制和计算机系统内存限制,也会造成阻塞。基于迭代和分解的近似解决方案方法结合了几种最新开发的计算便宜的算法来计算用户响应时间,同时考虑了通信网络的延迟和计算机系统的处理时间。我们还引入了一种快速的非迭代过程来分析具有外部进货和人口规模约束的QNM,从而使受阻客户排队。研究了窗口大小的选择和最小链接/分支路由对系统性能的影响。 P>
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