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High Performance WordPress Barry Abrahamson Matt  Mullenweg July 22, 2007 WordCamp 2007 – San Francisco, CA
The Problem Serve as many users as possible with a reasonable amount of resources
Un-tuned LAMP Stack Linux, Apache 2, PHP 4 or 5, MySQL 4.1 or 5.0 8 requests/sec 691,200 pageviews/day Enough for > 99% WP installations
Alternative PHP Cache (APC) http://pecl.php.net/package/APC 12 requests/second 1,036,800 pageviews/day 50% performance increase
WP-Cache http://mnm.uib.es/gallir/wp-cache-2/ 300 requests/sec 25,920,000 pageviews/day 25x increase!!!!! Possible gotcha http://markjaquith.wordpress.com/2006/02/13/adventures-with-wp-cache2-apc/
Apache Alternatives High concurrency Majority (90%) of requests on a page are static Litespeed, lighttpd, apache + fcgi, proxy
PHP 5 – Just for fun Same as PHP 4 without APC Same as PHP 4 with APC 3.0.14 Using APC from CVS, PHP5 is 15% faster than PHP4
When one isn’t enough Move the database to a second server (or 50) HyperDB Load balancing
HyperDB
Load Balancing Hardware or software? Pound http://www.apsis.ch/pound/ Thousands of requests/sec Layer 7
Caching Memcache http:// www.danga.com/memcached / Varnish http:// varnish.linpro.no WP-Cache alternatives
WordPress.com Over 1.2 million blogs 10+ million pageviews/day (dynamic) 40+ million hits/day (static + dynamic) 7,000+  database queries/second 80,000+ memcache calls/second http://wordpress.com/stats/
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High Performance WordPress

  • 1. High Performance WordPress Barry Abrahamson Matt Mullenweg July 22, 2007 WordCamp 2007 – San Francisco, CA
  • 2. The Problem Serve as many users as possible with a reasonable amount of resources
  • 3. Un-tuned LAMP Stack Linux, Apache 2, PHP 4 or 5, MySQL 4.1 or 5.0 8 requests/sec 691,200 pageviews/day Enough for > 99% WP installations
  • 4. Alternative PHP Cache (APC) http://pecl.php.net/package/APC 12 requests/second 1,036,800 pageviews/day 50% performance increase
  • 5. WP-Cache http://mnm.uib.es/gallir/wp-cache-2/ 300 requests/sec 25,920,000 pageviews/day 25x increase!!!!! Possible gotcha http://markjaquith.wordpress.com/2006/02/13/adventures-with-wp-cache2-apc/
  • 6. Apache Alternatives High concurrency Majority (90%) of requests on a page are static Litespeed, lighttpd, apache + fcgi, proxy
  • 7. PHP 5 – Just for fun Same as PHP 4 without APC Same as PHP 4 with APC 3.0.14 Using APC from CVS, PHP5 is 15% faster than PHP4
  • 8. When one isn’t enough Move the database to a second server (or 50) HyperDB Load balancing
  • 10. Load Balancing Hardware or software? Pound http://www.apsis.ch/pound/ Thousands of requests/sec Layer 7
  • 11. Caching Memcache http:// www.danga.com/memcached / Varnish http:// varnish.linpro.no WP-Cache alternatives
  • 12. WordPress.com Over 1.2 million blogs 10+ million pageviews/day (dynamic) 40+ million hits/day (static + dynamic) 7,000+ database queries/second 80,000+ memcache calls/second http://wordpress.com/stats/