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(to be completed)

 


ThinkMind // International Journal On Advances in Internet Technology, volume 9, numbers 1 and 2, 2016 // View article inttech_v9_n12_2016_1


An Experimental Evaluation of Performance Problems in HTTP Server Infrastructures Using Online Clients

Authors:
Ricardo Filipe
Serhiy Boychenko
Filipe Araujo

Keywords: Web monitoring; Client-side monitoring; Bottleneck.

Abstract:
Ensuring short response times is a major concern for all web site administrators. To keep these times under control, they usually resort to monitoring tools that collect a large spectrum of system metrics, such as CPU and memory occupation, network traffic, number of processes, etc. Despite providing a reasonably accurate picture of the server, the times that really matter are those experienced by the user. However, not surprisingly, system administrators will usually not have access to these end-to-end figures, due to their lack of control over web browsers. To overcome this problem, we follow the opposite approach of monitoring a site based on times collected from browsers. We use two browser-side metrics for this: i) the time it takes for the first byte of the response to reach the user (request time) and ii) the time it takes for the entire response to arrive (response time). We conjecture that an appropriate choice of the resources to control, more precisely, one or two web pages,suffices to detect CPU, network and disk input/output bottlenecks. In support of this conjecture, we run periodical evaluations of request and response times on some very popular web sites to detect bottlenecks. In this paper, we present a new experiment using pairs of synchronized clients, to extend the results we achieved with single-client requests in our previous work. Results suggest that collecting timing data from the browsers can indeed contribute to detect server performance problems and raise interesting questions regarding unfair delays that seem to exist in some specific requests.

Pages: 1 to 11

Copyright: Copyright (c) to authors, 2016. Used with permission.

Publication date: June 30, 2016

Published in: journal

ISSN: 1942-2652

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