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Improving the performance of distributed virtual environment systems

机译：改善分布式虚拟环境系统的性能

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摘要

The last years have witnessed a dramatic growth in the number as well as in the variety of distributed virtual environment systems. These systems allow multiple users, working on different client computers that are interconnected through different networks, to interact in a shared virtual world. One of the key issues in the design of scalable and cost-effective DVE systems is the partitioning problem. This problem consists of efficiently assigning the existing clients to the servers in the system and some techniques have been already proposed for solving it. This paper experimentally analyzes the correlation of the quality function proposed in the literature for solving the partitioning problem with the performance of DVE systems. Since the results show an absence of correlation, we also propose the experimental characterization of DVE systems. The results show that the reason for that absence of correlation is the nonlinear behavior of DVE systems with regard to the number of clients in the system. DVE systems reach saturation when any of the servers reaches 100 percent of CPU utilization. The system performance greatly decreases if this limit is exceeded in any server. Also, as a direct application of these results, we present a partitioning method that is targeted to keep all the servers in the system below a certain threshold value of CPU utilization, regardless of the amount of network traffic. Evaluation results show that the proposed partitioning method can improve DVE system performance, regardless of both the movement pattern of clients and the initial distribution of clients in the virtual world.
机译：最近几年见证了分布式虚拟环境系统的数量以及种类的急剧增长。这些系统允许在通过不同网络互连的不同客户端计算机上工作的多个用户在共享的虚拟世界中进行交互。在设计可扩展且经济高效的DVE系统时，关键问题之一是分区问题。该问题包括有效地将现有客户端分配给系统中的服务器，并且已经提出了一些技术来解决该问题。本文通过实验分析了文献中提出的质量函数的相关性，以解决DVE系统的性能分配问题。由于结果表明没有相关性，因此我们还提出了DVE系统的实验特性。结果表明，缺乏相关性的原因是DVE系统相对于系统中客户数量的非线性行为。当任何服务器达到CPU利用率的100％时，DVE系统就会达到饱和。如果任何服务器超过此限制，系统性能将大大降低。另外，作为这些结果的直接应用，我们提出了一种分区方法，旨在将系统中的所有服务器保持在CPU使用率的特定阈值以下，而不管网络流量如何。评估结果表明，无论虚拟环境中客户端的移动方式和客户端的初始分布如何，所提出的分区方法都可以提高DVE系统的性能。

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