A Combined LIFO-Priority Scheme for Overload Control of E-commerce Web Servers

E-commerce Web-servers often face overload conditions during which revenue-generating requests may be dropped or abandoned due to an increase in the browsing requests. In this paper we present a simple, yet effective, mechanism for overload control of E-commerce Web-servers. We develop an E-commerce workload model that separates the browsing requests from revenue-generating transaction requests. During overload, we apply LIFO discipline in the browsing queues and use a dynamic priority model to service them. The transaction queues are given absolute priority over the browsing queues. This is called the LIFOPri scheduling discipline. Experimental results show that LIFO-Pri dramatically improves the overall Web-server throughput while also increasing the completion rate of revenue-generating requests. The Web-server was able to operate at nearly 60% of its maximum capacity even when

• Type: Journal
• Year: 2006
• Where: CORR
• Authors: Naresh Singhmar, Vipul Mathur, Varsha Apte, D. Manjunath
• Keywords: CORR 2006, Dynamic Priority Model, E-commerce Web-servers, Education, Overload Conditions