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s Since memory usage of Apache processes tends to increase to the level of the most memory-hungry Tip page served by that child process, memory can be regained by setting the MaxRequestsPerChild value to a low number, such as 300 (the actual number will depend on your situation). Apache will work a little harder to generate new children, but the new children will use less RAM than the older ones they replace, so you can serve more requests in less RAM. The default setting for MaxRequestsPerChild is 0, meaning the processes will never expire.

The Style pane (Figure 5 14) lists CSS rules applied to an element. Properties applied to an element are organized by the rule they came from inherited, inline, or directly from a selector.

Apache is the most common web server used with Drupal, and it can be tweaked to provide better performance. The following sections will suggest some approaches to try. mod_expires This Apache module will let Drupal send out Expires HTTP headers, caching all static files in the user s browser for two weeks or until a newer version of a file exists. This goes for all images, CSS and JavaScript files, and other static files. The end result is reduced bandwidth and less traffic for the web server to negotiate. Drupal is preconfigured to work with mod_expires and will use it if it is available. The settings for mod_expires are found in Drupal s .htaccess file.

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Packaging EJBs 178 Exporting Files 180 EJB JAR File 180 ejb-jarxml 182 Deploying EJBs 185 Building EJBs 186 Publishing EJBs 186 Creating Server Configurations 187 Accessing the Deployed EJB 190 Creating EJB Clients 191 Enterprise Archive File 192 Summary 195.

# Requires mod_expires to be enabled. <IfModule mod_expires.c> # Enable expirations. ExpiresActive On # Cache all files for 2 weeks after access (A). ExpiresDefault A1209600 # Do not cache dynamically generated pages. ExpiresByType text/html A1 </IfModule> We can t let mod_expires cache HTML content, because the HTML content Drupal produces is not always static. This is the reason Drupal has its own internal caching system for its HTML output (i.e., page caching). Moving Directives from .htaccess to httpd.conf Drupal ships with two .htaccess files: one is at the Drupal root, and the other is automatically generated after you create your directory to store uploaded files and visit Administer File system to tell Drupal where the directory is. Any .htaccess files are searched for, read, and parsed on every request. In contrast, httpd.conf is only read when Apache is started. Apache directives can live in either file. If you have control of your own server, you should move the contents of the .htaccess files to the main Apache configuration file (httpd.conf) and disable .htaccess lookups within your web server root by setting AllowOverride to None: <Directory /> AllowOverride None ... </Directory> This prevents Apache from traversing up the directory tree of every request looking for the .htaccess file to execute. Apache will then have to do less work for each request, giving it more time to serve more requests.

Figure 5 14. The Style pane Properties are displayed alongside a link to their corresponding files. Property values can be edited, enabled, or disabled; changes made to each of these are immediately reflected in the current page. Entries shown with a strikethrough represent those ignored by the browser. The Style pane is not meant to convey the ordering of rules applied to an element; the Trace Styles pane, described next, is better suited to determining the ordering of rule application.

Another option is to use a web server other than Apache. Benchmarks have shown that, for example, the lighttpd web server generally serves more requests per second for Drupal. See http://buytaert.net/drupal-webserver-configurations-compared for more detailed comparisons.

CHAPTER 12 JavaServer Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197

Drupal does a lot of work in the database, especially for authenticated users and custom modules. It is common for the database to be the cause of the bottleneck. Here are some basic strategies for optimizing Drupal s use of the database.

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