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

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

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

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/

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

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

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

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

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

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/

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/

Questions