Don't use if: You're not on Apache 2. Improve this answer. Anthony Geoghegan 2, 1 1 gold badge 21 21 silver badges 33 33 bronze badges. Shane Madden Shane Madden k 12 12 gold badges silver badges bronze badges.
There's negligible difference between the kernel footprint for a process and an NPTL thread. It's a long way from earth-shattering. Nor what bearing you think SSL has on the whole she-bang. That's fine, but my opinion would be otherwise. Concurrency performance claims are not my own. See here. And the SSL difference is spelled out plainly in the documentation for the event MPM: The improved connection handling does not yet work for certain connection filters, in particular SSL.
But on Apache 2. The manual httpd. Show 6 more comments. Yura Yura 2 2 silver badges 3 3 bronze badges. Even if we use SSL? You saved my day. Andrew Schulman 8, 21 21 gold badges 29 29 silver badges 45 45 bronze badges.
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Featured on Meta. Now live: A fully responsive profile. The MPM Prefork module uses a single control process which is responsible for launching child processes.
These child processes listen for connections and serve them when they arrive. MPM Prefork is self-regulating, so unless you need a much larger overhead, there's very little cause for adjusting it's default configurations.
However, you do need to enable this module as it is disabled out of the box. I'll be demonstrating on Ubuntu Server Out of the box, however, it's not enabled. Apache2 has support for both prefork and worker. These are both MPMs, but are quite different from one another.
The prefork module creates a number of child processes at launch, each child process handles only one thread.
Conversely, worker uses child processes which spawn many threads per process, with each thread ready to take on new requests. Although prefork requires considerably more RAM, it is the safest module and should be employed when using non-thread-safe libraries. If you see no results, prefork isn't loaded.
On the off-chance your web server does need significant overhead, you can make adjustments to the prefork configuration. The server must be rebuilt in order to change the MPM.
Once the server has been compiled, it is possible to determine which MPM was chosen by using. This command will list every module that is compiled into the server, including the MPM. Attempting to LoadModule more than one MPM will result in a startup failure with the following error. This feature is enabled using the --enable-mpms-shared option of the configure script.
With argument all , all possible MPMs for the platform will be installed. Alternately, a list of MPMs can be specified as the argument. The default MPM, either selected automatically or specified with the --with-mpm option of the configure script, will be loaded in the generated server configuration file. Copyright The Apache Software Foundation. Licensed under the Apache License, Version 2.
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