Learn what slows Apache web server down, and how to get the most out of PHP.
Linux, Apache, MySQL, and PHP (or Perl) form the basis of the LAMP architecture for Web applications. Many open source packages based on LAMP components are available to solve a variety of problems. As the load on an application increases, the bottlenecks in the underlying infrastructure become more apparent in the form of slow response to user requests. The previous article showed you how to tune the Linux system and covered the basics of LAMP and performance measurement. This article focuses on the Web server components, Apache and PHP.
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Applications using the LAMP (Linux®, Apache, MySQL, PHP/Perl) architecture are constantly being developed and deployed. But often the server administrator has little control over the application itself because it's written by someone else. This series of three articles discusses many of the server configuration items that can make or break an application's performance. This second article focuses on steps you can take to optimize Apache and PHP.
This article focused on tuning the Web server, both Apache and PHP. With Apache, the general idea is to eliminate extra checks the Web server must do, such as processing the .htaccess file. You must also tune the Multi-Processing Module you're using to balance the system resources used with the availability of idle workers for incoming requests. The best thing you can do for PHP is to install an opcode cache. Keeping your eye on a few resource settings also ensures that scripts don't hog resources and make the system slow for everyone else.
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