NDLI: An overhead and resource contention aware analytical model for overloaded web servers

Content Provider	ACM Digital Library
Author	Apte, Varsha Mathur, Vipul
Abstract	Increased response time during periods of overload on a Web server may cause impatient users to time-out, causing the server to do unproductive work in processing these abandoned requests. Overhead time spent in preprocessing each request adds to the unproductive work even for requests that are not taken up for service. This causes the usable throughput, i.e. goodput, of the overloaded Web server to drop drastically, while resource utilization remains at 100%. Although this behaviour can be easily reproduced experimentally, existing analytical models of queues with abandonments are not able to do so.We present an analytical model that captures characteristics specific to networked software servers, namely, overhead processing and contention for shared hardware resources, that is able to explain the goodput degradation typically observed in overloaded servers. We use this model to compare the performance of the LIFO and FIFO queueing disciplines during overload and show that LIFO goodput and response time are better than those of FIFO.
Starting Page	26
Ending Page	37
Page Count	12
File Format	PDF
ISBN	1595932976
DOI	10.1145/1216993.1216999
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2007-02-05
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Markov chain Lifo Overload Analytical Model Resource sharing Queueing theory Web server
Content Type	Text
Resource Type	Article

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An overhead and resource contention aware analytical model for overloaded web servers