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Apache Multi Processing Modules (MPMs)

Created On: 30 Jan, 2017: 17:37:09 - Tags : server management


The Apache web server supports Multi Processing Modules (MPM) since version 2. An Apache MPM is a module that determines how Apache manages networking connections and output. Apache supports several MPM for different operating systems. The most commonly used MPMs are Prefork, Worker and Event MPMs

The Prefork MPM is single threaded, which means it only allows on thread per child process. This is not efficient and is not suitable for busy web sites

The Worker MPM allows multiple threads per child process. It is much more efficient than Prefork MPM.

The Event MPM is similar to the Worker MPM. It is more efficient than the Worker MPM since it allows a thread to perform more than one task. It has the lowest resource usage but is considered as experimental for Apache versions before 2.4. For Apache 2.4 and above, the Event MPM seems to be the most suitable MPM

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