Download Web Performance Tuning: Speeding Up the Web (O'Reilly by Patrick Killelea PDF

By Patrick Killelea

For so long as there is been an online, humans were attempting to make it swifter. The maturation of the net has intended extra clients, extra info, extra bells and whistles, and hence longer waits on the internet. enhanced functionality has develop into essentially the most vital elements in opting for the usability of either the internet normally and of person websites particularly. net functionality Tuning is ready getting the simplest functionality from the internet. This ebook is not only approximately tuning the net server software program; it is also approximately getting optimum functionality from a browser, tuning the (on either the server and browser ends), and maximizing the capability of the community itself. internet functionality Tuning hits the floor operating, giving concrete suggestion for speedy results--the "blunt tools" for making improvements to crippled functionality at once. The booklet then takes a breath and pulls again to offer a conceptual heritage of the foundations of computing functionality. The latter half the e-book methods each one section of an online transaction--from purchaser to community to server--to learn the susceptible hyperlinks within the chain and the way to bolster them. counsel comprise: utilizing simultaneous downloads to find bottlenecks Adjusting TCP for higher net functionality decreasing the effect of DNS Upgrading equipment drivers utilizing possible choices to CGI finding the net server strategically Minimizing browser cache lookups fending off symbolic hyperlinks for web pages

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Even once the decision is made, the router will usually have to wait for an open slot to send the packet. The latency of your packets will therefore depend strongly on the number of router hops between the web server and the user. Routers themselves will have connections to each other that vary in latency and throughput. The odd, yet essential thing about the Internet is that the path between two endpoints can change automatically to accommodate network trouble, so your latency may vary from packet to packet.

Remember that there's no point in buying server hardware that has vastly more throughput capacity than the network it's connected to if you can't use that server's throughput. The web server software and operating system determine how efficiently you can use your server hardware. In practice, HTTP server software is not a bottleneck. For example, Apache running on Linux on a low-end Pentium machine can fill a 10Mbps line with static HTML content. If a significant load is put on your server, it will be from dynamic content generation, such as CGIs, Java servlets, and database queries.

You can use the Expect scripting language to run an FTP test automatically at regular intervals. Other scripting languages have a difficult time controlling the terminal of a spawned process; if you start FTP from within a shell script, for example, execution of the script halts until FTP returns, so you cannot continue the FTP session. Expect is designed to deal with this exact problem. Expect is well documented in Exploring Expect, by Don Libes (O'Reilly & Associates). You can of course also retrieve content via HTTP from your server to test network performance, but this does not cleanly distinguish network performance from server performance.

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