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Suse openSUSE 12.2 Manual

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20.4.4 Multiprocessing Modules
openSUSE provides two different multiprocessing modules (MPMs) for use with
Apache:
• Prefork MPM (page 384)
• Section 20.4.4.2, “Worker MPM” (page 384)
20.4.4.1 Prefork MPM
The prefork MPM implements a nonthreaded, preforking Web server. It makes the Web
server behave similarly to Apache version 1.x. In this version it isolates each request
and handles it by forking a separate child process. Thus problematic requests cannot
affect others, avoiding a lockup of the Web server.
While providing stability with this process-based approach, the prefork MPM consumes
more system resources than its counterpart, the worker MPM. The prefork MPM is
considered the default MPM for Unix-based operating systems.
IMPORTANT: MPMs in This Document
This document assumes Apache is used with the prefork MPM.
20.4.4.2 Worker MPM
The worker MPM provides a multi-threaded Web server. A thread is a “lighter” form
of a process. The advantage of a thread over a process is its lower resource consumption.
Instead of only forking child processes, the worker MPM serves requests by using
threads with server processes. The preforked child processes are multi-threaded. This
approach makes Apache perform better by consuming fewer system resources than the
prefork MPM.
One major disadvantage is the stability of the worker MPM: if a thread becomes corrupt,
all threads of a process can be affected. In the worst case, this may result in a server
crash. Especially when using the Common Gateway Interface (CGI) with Apache under
heavy load, internal server errors might occur due to threads being unable to communi-
cate with system resources. Another argument against using the worker MPM with
384 Reference
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