Apache MPM prefork

Description:	Implements a non-threaded, pre-forking web server
Status:	MPM
Module Identifier:	mpm_prefork_module
Source File:	prefork.c

Summary

This Multi-Processing Module (MPM) implements a non-threaded, pre-forking web server. Each server process may answer incoming requests, and a parent process manages the size of the server pool. It is appropriate for sites that need to avoid threading for compatibility with non-thread-safe libraries. It is also the best MPM for isolating each request, so that a problem with a single request will not affect any other.

This MPM is very self-regulating, so it is rarely necessary to adjust its configuration directives. Most important is that MaxRequestWorkers be big enough to handle as many simultaneous requests as you expect to receive, but small enough to assure that there is enough physical RAM for all processes.

Topics

• How it Works

Directives

• CoreDumpDirectory
• EnableExceptionHook
• Group
• Listen
• ListenBacklog
• MaxConnectionsPerChild
• MaxMemFree
• MaxRequestWorkers
• MaxSpareServers
• MinSpareServers