计算机科学 ›› 2010, Vol. 37 ›› Issue (1): 57-59.
• 计算机网络与信息安全 • 上一篇 下一篇
高昂,慕德俊,胡延苏,潘文平
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基金资助:
GAO Ang,MU De-jun,HU Yan-su,PAN Wen-ping
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摘要： 控制理论已被应用于Web服务器中，以改进其QoS性能。但当Web负载剧烈变化时，已有的基于反馈的比例延迟控制的实时性往往不佳。分析了HTTP1. 1请求页面中嵌入URL的个数和嵌入文件大小的重尾特征，根据Web服务器的排队特性以及HTTP1. 1持续连接的特点，通过不同优先级等待队列的长度来预测排队延迟，从而调整相应的服务线程配额，实现相对比例延迟保证。实验证明，这种方法取得了良好的效果，显著提高了系统的动态性能。
关键词: Web QoS，预测控制，比例延迟保证，重尾分布
Abstract: Control theory is being used for QoS in Web server, but when workload varies significantly, the real-time performance of the feedback control needs to be improved. After analysing the heavy-tailed property of the number and size of embedded URL in the required pages,based on the ctueuing feature of the Web server and the HTTP 1. 1 persistent connection,a predictive approach was desired to achieve the relative delay guarantee by calculating the future delay of the different priorities and adjusting their ctuota of service threads. The experimental results demonstrate that the pro- posed approach achieves a better dynamic performance.
Key words: Web QoS, Predictive control, Proportional delay guarantee, Heavy-tailed distribution
高昂,慕德俊,胡延苏,潘文平. Web QoS中的预测控制与比例延迟保证[J]. 计算机科学, 2010, 37(1): 57-59. https://doi.org/
GAO Ang,MU De-jun,HU Yan-su,PAN Wen-ping. Predictive Control and Proportional Delay Guarantee in Web QoS[J]. Computer Science, 2010, 37(1): 57-59. https://doi.org/
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