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Last Modified: 10.10.2012
The supposed two-tier architecture and the recommendations will produce the following results.
The system memory consumption is stable. Front-End and Back-End use the reserved memory pool which would not grow even if the load increases.
The system will process all requests at stress load orderly and regularly. The back-end will not run excessive web server processes more than specified by MaxClients. The front-end will accept all client requests, and wait for the release of a back-end web process if required.
The usage of processor power is limited by the MaxClients parameter which helps to avoid performance degradation.
Fast persistent database connections can be used safely owing to the fact that only a certain number of web server processes will be run at the back-end.
The precompilation of PHP scripts releases processor resources significantly.