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    copied!<p>The king of the hill for high-speed static web serving is asynchronous I/O, at least the last time it looked. At one point there was a web server called 'Zeus' that used this type of architecture. It was specifically designed for serving high-volume static content - guess which industry.</p> <p>Threading and synchronisation is more expensive than you think. Asynchronous architecture is used quite widely in servers and can be made very resource efficient. Often a single thread is so fast that it can outrun multi-threaded servers by a considerable margin. </p> <p>Using asynccore (a Python async server framework) I could make a single threaded XML-RPC server that could connect to a database, issue a simple query, cose the connection and reply to the request faster than a multi-threaded server with a thread pool. On a single CPU machine it was about 2.5x faster.</p> <p>Rolling your own async server isn't that hard. I've seen them assigned as second-year computer science assignments. You can probably find Async web server libraries for most languages - Python comes with one in the standard library.</p> <p>Finally, I don't have much time for people saying 'do it but it must be done in two weeks.' If your business case can only justify two weeks development time, consider not bothering - the business case is too marginal unless it really is low-hanging fruit. I mechanically translate a marginal business case to no business case at all. If it's important give me time to do it for real. If it's not important don't do it at all. </p> <p>There we go - just saved you two weeks and all the ongoing maintenance costs.</p>
 

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