What sort of architecture does Zeus use?Zeus uses a combination of a non-blocking IO multiplexing architecture (for IO bound tasks like serving static pages) and a kernel multi-threaded server (for interfacing to dynamic APIs such as ISAPI and NSAPI). Where other web servers use a single process or single thread per connection in conjunction with blocking sockets, the Zeus Web Server uses a single process and single thread to handle all incoming connections. Multiplexing of numerous simultaneous connections is possible using non-blocking IO. This architecture eliminates the context-switching overheads associated with the per-process and per-thread models, and explains Zeus Web Server's exceptional performance. The out-of-process runners, zeus.nsapi and zeus.isapi, are multi-threaded. In short, Zeus is designed to give near-linear performance improvements as you add CPUs to your machine. For an example of the scaling you can achieve, see HP's submitted SPEC results on the same N-class machine with 1,2,4 and 8 CPUs in it.
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[Administrator] 19 September 2005
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