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CentOS Linux 5.2 and Apache 2.2 vs. Microsoft Windows Web Server 2008 and IIS 7.0 when Serving Static and PHP Content
Moore DJ, Dowland PS
Advances in Communications, Computing, Networks and Security 6, ISBN: 978-1-84102-258-1, pp92-97, 2009
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This research paper intends to find out which operating system and web server is faster when hosting static and PHP generated content. The results could potentially sway end users who are not sure of which web server they would like to use with static and PHP content. The feud between Microsoft Windows and Linux is very long standing and this paper will throw some light to this specific area. Both servers were installed with the default settings and configured with three web applications and benchmarked using a load generation tool to see which provided a higher number of requests per second. Microsoft Windows served 1184 requests per second for static content and an average of 8.5 requests per second for the PHP applications. Linux performed far worse in the static test with only 789 requests per second, but served an average of 10.6 requests per second for the PHP applications. Linux is better able to process the PHP applications, but Microsoft Windows is better for serving static content when the default configuration of both operating systems is used.

Moore DJ, Dowland PS