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Sample Annotated Prefork and Worker MPM configurations
Further httpd Configuration example from a Well House Consultants training course
More on Further httpd Configuration [link]

This example is described in the following article(s):
   • Tuning httpd / the supermarket checkout comparison - [link]
   • Tuning Apache httpd and Tomcat to work well together - [link]

Source code: mpmsample.conf Module: A603
# Sample Annotated Prefork and Worker MPM configurations
# Apache 2.2.x ... from /usr/local/apache2/conf/extra/httpd-mpm.conf

# Prefork MPM example - for systems with one cpu

# Setting up with 35 memory slots for servers (that's the serverlimit)
# and all 35 of them may be used (the maxclients). If you change the
# serverlimit you have to stop and restart the apache daemon, but if
# you only change maxclients you can do a "graceful" and not put a
# blip in traffic

# four server are started when the server is started, and the number is
# increased to a maximum of 35 (maxclients) as required, with four spare
# servers being opened up ahead as traffic increases. As traffic drops
# away, the server leaves eight open servers available and waiting.

<IfModule mpm_prefork_module>
    ServerLimit 35
    StartServers 4
    MinSpareServers 4
    MaxSpareServers 8
    MaxClients 35
    MaxRequestsPerChild 2000
</IfModule>

# Worker MPM example - for systems with lots of cpus

# Initially, start two servers (startservers) each with a
# fixed number of threads (threadsperchild) - that's 25 each
# making an initial total of 50 thread. As traffic grows
# the pool of free threads will reduce; once it gets down
# to 25 (minsparethreads) start another server - that will
# add a further 25 threads because that's the size of blocks
# they come in. There's a maximum of 150 client threads, and
# they will be spread over six servers (thats calculated from
# maxclients / threadsperchild) so that in this example you
# mayt be service from six cpus.

<IfModule mpm_worker_module>
    StartServers 2
    MaxClients 150
    MinSpareThreads 25
    MaxSpareThreads 75
    ThreadsPerChild 25
    MaxRequestsPerChild 0
</IfModule>

# apachectl -l ... tells you which you are running:
#
# -bash-3.2$ ./apachectl -l
# Compiled in modules:
# core.c
# mod_authn_file.c
# [etc]
# prefork.c
# [etc]
# -bash-3.2$
Learn about this subject
This module and example are covered on the following public courses:
 * Deploying Apache and Tomcat
 * Deploying LAMP - Linux, Apache, MySQL, Perl/PHP
 * Linux Web Server
 * Deploying Java Applications on Linux / Unix
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Lamp deployment are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Further httpd Configuration" training module. You'll find a description of the topic and some other closely related examples on the "Further httpd Configuration" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

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