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Summary: An Overhead and Resource Contention Aware Analytical
Model for Overloaded Web Servers
Vipul Mathur
vipulmathur@iitb.ac.in
Varsha Apte
varsha@cse.iitb.ac.in
Department of Computer Science and Engineering
Indian Institute of Technology - Bombay
Powai, Mumbai, Maharashtra 400076, India
ABSTRACT
Increased response time during periods of overload on a Web server
may cause impatient users to time-out, causing the server to do un-
productive 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%. Al-
though this behaviour can be easily reproduced experimentally, ex-
isting analytical models of queues with abandonments are not able
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