Selecting a Multi Processing Module

--with-mpm=worker --with-mpm=prefork

Although MPM selection depends on many factors, including support for specific third-party modules and functionality, some MPMs perform better on certain platforms. For example, processes on AIX are "heavy" and a threaded MPM is preferred on this platform for scalability. It is not possible to change the request processing mechanism in Apache 1.3. For Apache 2, you select an MPM during the configuration and build process with the --with-mpm option. Currently, Windows has its own thread-based MPM, and Unix has two stable MPMs: prefork and worker. A number of additional modules are distributed with the server and considered experimental. The following sections explain the features of the different MPMs and how to configure them.