How to optimize Apache performance
Apache is modular in that you can add and remove features easily. Multi-Processing Modules (MPMs) provide this modular functionality at the core of Apache -- managing the network connections and dispatching the requests. MPMs let you use threads or even move Apache to a different operating system. Only one MPM can be active at one time, and it must be compiled in statically with --with-mpm=(worker|prefork|event) . The traditional model of one process per request is called prefork . A newer, threaded, model is called worker , which uses multiple processes, each with multiple threads to get better performance with lower overhead. The final, event MPM is a module that keeps separate pools of threads for different tasks. To determine which MPM you're currently using, execute httpd -l Choosing the correct MPM to use depends on many factors. On the surface, threading sounds better than forking, if all the underlying modules are thread safe, including al...