Detecting Timed-Out Client Requests for Avoiding Livelock and Improving Web Server Performance

Authors:
Richard Carter;Ludmila Cherkasova
Affiliations:
-;-
Venue:
ISCC '00 Proceedings of the Fifth IEEE Symposium on Computers and Communications (ISCC 2000)
Year:
2000

Citing 1
Cited 2

Object-oriented simulation modeling with C++/CSIM17

WSC '95 Proceedings of the 27th conference on Winter simulation

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

WOSP '07 Proceedings of the 6th international workshop on Software and performance
An overhead and resource contention aware analytical model for overloaded Web servers

Journal of Systems and Software

Quantified Score

Hi-index	0.00

Visualization

Abstract

A Web server's listen queue capacity is often set to a large value to accommodate bursts of traffic and to accept as many client requests as possible. We show that, under certain overload conditions, this results in a significant loss of server performance due to the processing of so-called 驴dead requests驴: timed-out client requests whose associated connection has been closed from the client side. In some pathological cases, these overload conditions can lead to server livelock, where the server is busily processing only dead requests and is not doing any useful work. We propose a method of detecting these dead requests and avoiding unnecessary overhead related to their processing. This provides a predictable and controllable platform for web applications, thus improving their overall performance. DTOC strategy is implemented as a part of WebQoS product for HP9000 servers [HP-WebQoS].