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II. Tuning in Depth > 18. Server Software

Chapter 18. Server Software

Web servers accept requests and return replies. The reply can be a static page, custom dynamic content, or an error. While there is a lot of variation in performance depending on load, an individual request for a static page typically takes only one-tenth of a second from the time the request arrives at the server until the response is pushed back out. Modem latency, Internet latency, and even browser-parsing time are all likely to be larger than that, so a lightly loaded web server will not be a bottleneck.

A heavily loaded web server is another story. Web servers tend to go nonlinear when loaded beyond a certain point, degrading rapidly in performance. This chapter is about why that happens and what your options are for getting the most out of your web server software.


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