httperf—a tool for measuring web server performance
ACM SIGMETRICS Performance Evaluation Review
SEDA: an architecture for well-conditioned, scalable internet services
SOSP '01 Proceedings of the eighteenth ACM symposium on Operating systems principles
Session-Based Admission Control: A Mechanism for Peak Load Management of Commercial Web Sites
IEEE Transactions on Computers
Overload control in QoS-aware web servers
Computer Networks: The International Journal of Computer and Telecommunications Networking - Small and home networks
Adaptive Resource-based Web Server Admission Control
ISCC '02 Proceedings of the Seventh International Symposium on Computers and Communications (ISCC'02)
A method for transparent admission control and request scheduling in e-commerce web sites
Proceedings of the 13th international conference on World Wide Web
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Web-sites, especially E-commerce ones, are often faced with incoming load of requests that exceeds their capacity, i.e, they are subjected to overload. Most existing servers show severe throughput degradation at high overload. Overload control mechanisms are required to prevent such occurrences. In this paper, we present a proxy-based overload control mechanism, which uses the drop in throughput relative to arrival rate as an indicator of overload. On overload detection, a self-clocked admission control is activated, which admits a new request only when a successful reply is observed to be leaving the server system. Thus, the mechanism is self-tuned, and requires no knowledge of the system. We validate our approach on an experimental testbed consisting of a two-tier Web application, and find that even at very high overload, the server operates at its maximum capacity while keeping response times within acceptable bounds.